From 8a029ed0dc5f7d16fd9b8e1b6a7942eef99b47fd Mon Sep 17 00:00:00 2001
From: Hong Minhee <hong@minhee.org>
Date: Tue, 23 Jun 2026 23:09:09 +0900
Subject: [PATCH 01/13] Switch init templates to Oxfmt and Oxlint

Generated Node.js and Bun projects now share the Oxc toolchain for
formatting and linting.  The generated Oxlint config loads Fedify's
rules through @fedify/lint/oxlint, and generated projects get Oxc
editor recommendations and package scripts for format, format:check,
and lint.

The init test harness now runs the generated formatter and linter for
hydrated Node.js and Bun projects.  Framework scaffolders that produce
conflicting ESLint artifacts or unformatted files are cleaned up before
Fedify writes its files.

Closes https://github.com/fedify-dev/fedify/issues/703

Assisted-by: Codex:gpt-5.5
---
 CHANGES.md                                    |  14 ++
 docs/cli.md                                   |   4 +-
 docs/install.md                               |  46 ++--
 docs/tutorial/astro-blog.md                   |  11 +-
 docs/tutorial/content-sharing.md              |  12 +-
 docs/tutorial/microblog.md                    |  25 +-
 docs/tutorial/threadiverse.md                 |  81 ++----
 packages/init/src/action/cleanup.ts           |  53 ++++
 packages/init/src/action/configs.test.ts      | 235 +++++++++++++++---
 packages/init/src/action/configs.ts           |  15 +-
 packages/init/src/action/deps.ts              |   2 +-
 packages/init/src/action/mod.ts               |   2 +
 packages/init/src/action/patch.ts             |   3 +-
 packages/init/src/action/templates.ts         |  17 +-
 packages/init/src/json/biome.json             |  19 --
 packages/init/src/json/deps.json              |   4 +-
 packages/init/src/json/oxfmt.json             |  17 ++
 packages/init/src/json/oxlint.json            |  40 +++
 packages/init/src/json/vscode-settings.json   |  21 +-
 .../src/templates/bare-bones/main/bun.ts.tpl  |   6 +-
 .../src/templates/bare-bones/main/node.ts.tpl |  15 +-
 .../templates/defaults/eslint.config.ts.tpl   |   3 -
 .../templates/defaults/federation.oxc.ts.tpl  |  21 ++
 .../src/templates/elysia/index/bun.ts.tpl     |   2 +-
 .../src/templates/elysia/index/node.ts.tpl    |   4 +-
 .../init/src/templates/hono/index/node.ts.tpl |   3 +-
 .../init/src/templates/next/middleware.ts.tpl |   6 +-
 .../src/templates/nitro/nitro.config.ts.tpl   |   4 +-
 .../src/templates/nitro/server/error.ts.tpl   |   2 +-
 .../nitro/server/middleware/federation.ts.tpl |   8 +-
 .../nitro/server/routes/index.ts.tpl          |  11 +
 packages/init/src/test/create.ts              |  33 +++
 packages/init/src/types.ts                    |   8 +
 packages/init/src/utils.ts                    |  54 +++-
 packages/init/src/webframeworks.test.ts       |  34 ++-
 packages/init/src/webframeworks/astro.ts      |   9 +-
 packages/init/src/webframeworks/bare-bones.ts |   9 +-
 packages/init/src/webframeworks/const.ts      |   4 +-
 packages/init/src/webframeworks/elysia.ts     |   9 +-
 packages/init/src/webframeworks/express.ts    |  11 +-
 packages/init/src/webframeworks/hono.ts       |  11 +-
 packages/init/src/webframeworks/next.ts       |  14 +-
 packages/init/src/webframeworks/nitro.ts      |  35 ++-
 packages/init/src/webframeworks/nuxt.ts       |   9 +-
 packages/init/src/webframeworks/solidstart.ts |   9 +-
 packages/init/src/webframeworks/utils.ts      |  10 +
 46 files changed, 666 insertions(+), 299 deletions(-)
 create mode 100644 packages/init/src/action/cleanup.ts
 delete mode 100644 packages/init/src/json/biome.json
 create mode 100644 packages/init/src/json/oxfmt.json
 create mode 100644 packages/init/src/json/oxlint.json
 delete mode 100644 packages/init/src/templates/defaults/eslint.config.ts.tpl
 create mode 100644 packages/init/src/templates/defaults/federation.oxc.ts.tpl
 create mode 100644 packages/init/src/templates/nitro/server/routes/index.ts.tpl

diff --git a/CHANGES.md b/CHANGES.md
index e31c26545..db42f5448 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -296,6 +296,12 @@ To be released.
     corresponding `@fedify/init` update, which skips automatic dependency
     installation after scaffolding.  [[#720], [#776] by fru1tworld]
 
+ -  Switched Node.js and Bun projects generated by `fedify init` from Biome
+    plus ESLint to Oxfmt plus Oxlint.  New projects now get *.oxfmtrc.json*,
+    *.oxlintrc.json*, Oxc editor recommendations, and package scripts for
+    `format`, `format:check`, and `lint`; the Oxlint config loads Fedify's
+    rules through `@fedify/lint/oxlint`.  [[#703], [#818]]
+
  -  Added the `fedify bench` command for benchmarking Fedify federation
     workloads.  It acts as a synthetic remote actor that drives
     ActivityPub-specific load (signed inbox deliveries and WebFinger lookups)
@@ -328,6 +334,7 @@ To be released.
     results.  This change is published as benchmark report schema version 3
     and comparison report schema version 1.  [[#744], [#786], [#804]]
 
+[#703]: https://github.com/fedify-dev/fedify/issues/703
 [#720]: https://github.com/fedify-dev/fedify/issues/720
 [#776]: https://github.com/fedify-dev/fedify/pull/776
 [#783]: https://github.com/fedify-dev/fedify/issues/783
@@ -337,6 +344,7 @@ To be released.
 [#801]: https://github.com/fedify-dev/fedify/pull/801
 [#802]: https://github.com/fedify-dev/fedify/pull/802
 [#804]: https://github.com/fedify-dev/fedify/pull/804
+[#818]: https://github.com/fedify-dev/fedify/pull/818
 
 ### @fedify/fixture
 
@@ -390,6 +398,12 @@ To be released.
     root, or when you want to inspect the generated files before
     installing.  [[#720], [#776] by fru1tworld]
 
+ -  Switched generated Node.js and Bun projects from Biome plus ESLint to
+    Oxfmt plus Oxlint.  New projects now get *.oxfmtrc.json*,
+    *.oxlintrc.json*, Oxc editor recommendations, and package scripts for
+    `format`, `format:check`, and `lint`; the Oxlint config loads Fedify's
+    rules through `@fedify/lint/oxlint`.  [[#703], [#818]]
+
 ### @fedify/lint
 
  -  Added official Oxlint support through a new `@fedify/lint/oxlint` subpath
diff --git a/docs/cli.md b/docs/cli.md
index 394ebf845..588803b74 100644
--- a/docs/cli.md
+++ b/docs/cli.md
@@ -250,8 +250,8 @@ project.  It will ask you a few questions to set up the project:
 > [!TIP]
 > Projects created with `fedify init` automatically include [`@fedify/lint`]
 > for consistent code linting.  Deno projects get a lint plugin configured in
-> *deno.json*, while Node.js and Bun projects get an *eslint.config.ts* with
-> `@fedify/lint`.
+> *deno.json*, while Node.js and Bun projects get an *.oxlintrc.json* with
+> `@fedify/lint/oxlint`.
 
 > [!NOTE]
 > If you find the full `@fedify/cli` toolchain too heavy for your needs, you
diff --git a/docs/install.md b/docs/install.md
index e41382153..ab767d3e9 100644
--- a/docs/install.md
+++ b/docs/install.md
@@ -230,37 +230,21 @@ it as the default formatter for JavaScript and TypeScript:
 Deno's [*Set up your environment*] guide covers other editors and shells.
 
 *For Node.js/Bun projects*, `fedify init` writes a *.vscode/extensions.json*
-that recommends the [Biome extension] and the [ESLint extension]:
+that recommends the [Oxc extension]:
 
 ~~~~ json [.vscode/extensions.json]
-{ "recommendations": ["biomejs.biome", "dbaeumer.vscode-eslint"] }
+{ "recommendations": ["oxc.oxc-vscode"] }
 ~~~~
 
-The matching *.vscode/settings.json* sets Biome as the default formatter and
-runs Biome's import organiser on save:
+The matching *.vscode/settings.json* sets Oxfmt as the default formatter and
+enables Oxc's fix-all action on save:
 
 ~~~~ jsonc [.vscode/settings.json]
 {
   "editor.detectIndentation": false,
   "editor.indentSize": 2,
   "editor.insertSpaces": true,
-  "[typescript]": {
-    "editor.defaultFormatter": "biomejs.biome",
-    "editor.formatOnSave": true,
-    "editor.codeActionsOnSave": {
-      "source.organizeImports.biome": "always"
-    }
-  }
-  // The same block applies to [javascript], [javascriptreact],
-  // [typescriptreact], [json], and [jsonc].
-}
-~~~~
-
-If you prefer [Oxc] over Biome and ESLint, install the [oxc-vscode]
-extension and swap the formatter:
-
-~~~~ jsonc [.vscode/settings.json]
-{
+  "oxc.fmt.configPath": ".oxfmtrc.json",
   "[typescript]": {
     "editor.defaultFormatter": "oxc.oxc-vscode",
     "editor.formatOnSave": true,
@@ -268,15 +252,14 @@ extension and swap the formatter:
       "source.fixAll.oxc": "always"
     }
   }
+  // The same block applies to [javascript], [javascriptreact],
+  // [typescriptreact], [json], and [jsonc].
 }
 ~~~~
 
 [Deno extension]: https://marketplace.visualstudio.com/items?itemName=denoland.vscode-deno
 [*Set up your environment*]: https://docs.deno.com/runtime/getting_started/setup_your_environment/
-[Biome extension]: https://marketplace.visualstudio.com/items?itemName=biomejs.biome
-[ESLint extension]: https://marketplace.visualstudio.com/items?itemName=dbaeumer.vscode-eslint
-[Oxc]: https://oxc.rs/
-[oxc-vscode]: https://marketplace.visualstudio.com/items?itemName=oxc.oxc-vscode
+[Oxc extension]: https://marketplace.visualstudio.com/items?itemName=oxc.oxc-vscode
 
 ### Zed
 
@@ -319,10 +302,9 @@ Zed's [Deno language docs][zed-deno] cover the available options.
 [Hackers' Pub] is a real-world reference.
 
 *For Node.js/Bun projects*, Zed enables its bundled TypeScript language
-server out of the box; the typical addition is wiring up Biome (or the
-formatter you chose) for `editor.formatOnSave`-style behaviour.  See Zed's
-[TypeScript language docs][zed-ts] for setup.  If you prefer [Oxc] instead,
-set Oxc as the language server and turn on its fix-all action on format:
+server out of the box; the typical addition is wiring up Oxc for formatting
+and lint fixes.  See Zed's [TypeScript language docs][zed-ts] for setup.
+Set Oxc as the language server and turn on its fix-all action on format:
 
 ~~~~ jsonc [.zed/settings.json]
 {
@@ -343,9 +325,9 @@ Linting
 
 `fedify init` configures the [`@fedify/lint`] plugin automatically: Deno
 projects pick it up through `lint.plugins` in *deno.json*, and Node.js/Bun
-projects through a generated *eslint.config.ts*.  For the full rule list,
-configuration options, and how to run the linter, see the
-[*Linting*](./manual/lint.md) chapter.
+projects through a generated *.oxlintrc.json* using `@fedify/lint/oxlint`.
+For the full rule list, configuration options, and how to run the linter, see
+the [*Linting*](./manual/lint.md) chapter.
 
 [`@fedify/lint`]: https://jsr.io/@fedify/lint
 
diff --git a/docs/tutorial/astro-blog.md b/docs/tutorial/astro-blog.md
index c83e3515e..832daf37a 100644
--- a/docs/tutorial/astro-blog.md
+++ b/docs/tutorial/astro-blog.md
@@ -198,7 +198,8 @@ After a moment, you'll have a working project with the following structure:
      -  *middleware.ts* — Connects Fedify to Astro's request pipeline
  -  *public/* — Files served as-is (favicon, etc.)
  -  *astro.config.ts* — Astro configuration
- -  *biome.json* — Code formatter and linter settings
+ -  *.oxfmtrc.json* — Code formatter settings
+ -  *.oxlintrc.json* — Code linter settings
  -  *package.json* — Package metadata and scripts
  -  *tsconfig.json* — TypeScript settings
 
@@ -215,9 +216,9 @@ includes settings for it.
 After [installing VS Code], open the project folder: *File* → *Open Folder…*.
 
 If a popup asks you to install the recommended extensions, click *Install
-All*.  This installs the [Biome extension] (formats and lints your code on
-save) and the [Astro extension] (syntax highlighting and IntelliSense for
-*.astro* files).
+All*.  This installs the [Oxc extension] (formats and lints JavaScript and
+TypeScript on save) and the [Astro extension] (syntax highlighting and
+IntelliSense for *.astro* files).
 
 Let's verify the project works.  First, install the dependencies:
 
@@ -284,7 +285,7 @@ Stop the dev server with <kbd>Ctrl</kbd>+<kbd>C</kbd> for now.
 
 [Visual Studio Code]: https://code.visualstudio.com/
 [installing VS Code]: https://code.visualstudio.com/docs/setup/setup-overview
-[Biome extension]: https://marketplace.visualstudio.com/items?itemName=biomejs.biome
+[Oxc extension]: https://marketplace.visualstudio.com/items?itemName=oxc.oxc-vscode
 [Astro extension]: https://marketplace.visualstudio.com/items?itemName=astro-build.astro-vscode
 [actor]: https://www.w3.org/TR/activitypub/#actors
 
diff --git a/docs/tutorial/content-sharing.md b/docs/tutorial/content-sharing.md
index 9967007a2..eef00b083 100644
--- a/docs/tutorial/content-sharing.md
+++ b/docs/tutorial/content-sharing.md
@@ -223,7 +223,8 @@ The most interesting files and directories are:
  -  *nuxt.config.ts*: Nuxt's configuration file; already has `@fedify/nuxt`
     wired up as a module.
  -  *package.json*: npm metadata and dependencies.
- -  *biome.json*: [Biome] formatter and import-sorting configuration.
+ -  *.oxfmtrc.json*: [Oxfmt] formatter configuration.
+ -  *.oxlintrc.json*: [Oxlint] configuration, including Fedify lint rules.
  -  *tsconfig.json*: TypeScript compiler references to the generated Nuxt
     type files.
 
@@ -233,7 +234,8 @@ TypeScript in their `<script>` blocks).
 
 [LogTape]: https://logtape.org/
 [Nitro server plugin]: https://nitro.build/guide/plugins
-[Biome]: https://biomejs.dev/
+[Oxfmt]: https://oxc.rs/docs/guide/usage/formatter/
+[Oxlint]: https://oxc.rs/docs/guide/usage/linter/
 
 ### Running the dev server for the first time
 
@@ -313,7 +315,7 @@ That tells us a few important things at once:
 while following this tutorial.  We are about to write a lot of TypeScript
 and Vue, and VS Code is currently the smoothest editor for both.  The
 scaffolded project even ships with a *.vscode/* directory that recommends
-the right extensions (Biome for formatting, Volar for Vue).
+the right extensions (Oxc for formatting and linting, Volar for Vue).
 
 > [!WARNING]
 > Don't confuse Visual Studio Code with Visual Studio.  The two share a
@@ -772,7 +774,9 @@ to type the tool's name directly.  Edit *package.json*:
     "generate": "nuxt generate",
     "preview": "nuxt preview",
     "postinstall": "nuxt prepare",
-    "lint": "eslint .",
+    "format": "oxfmt",
+    "format:check": "oxfmt --check",
+    "lint": "oxlint .",
     "db:push": "drizzle-kit push",
     "db:studio": "drizzle-kit studio"
   }
diff --git a/docs/tutorial/microblog.md b/docs/tutorial/microblog.md
index 328f366eb..85e7b9be7 100644
--- a/docs/tutorial/microblog.md
+++ b/docs/tutorial/microblog.md
@@ -210,7 +210,8 @@ the following structure:
      -  *federation.ts* — ActivityPub server
      -  *index.ts* — Entry point
      -  *logging.ts* — Logging configuration
- -  *biome.json* — Formatter and linter settings
+ -  *.oxfmtrc.json* — Formatter settings
+ -  *.oxlintrc.json* — Linter settings
  -  *package.json* — Package metadata
  -  *tsconfig.json* — TypeScript settings
 
@@ -297,11 +298,11 @@ linters.
 After [installing Visual Studio Code], open the working directory by selecting
 *File* → *Open Folder…* from the menu.
 
-If you see a popup in the bottom right asking <q>Do you want to install
-the recommended ‘Biome’ extension from biomejs for this repository?</q>,
-click the *Install* button to install the extension. Installing this extension
-will automatically format your TypeScript code, so you don't have to wrestle
-with code styles like indentation or spacing when writing TypeScript code.
+If you see a popup in the bottom right asking you to install the recommended
+Oxc extension for this repository, click the *Install* button to install the
+extension. Installing this extension will automatically format your TypeScript
+code, so you don't have to wrestle with code styles like indentation or
+spacing when writing TypeScript code.
 
 > [!TIP]
 > If you're a loyal Emacs or Vim user, we won't discourage you from using your
@@ -2417,7 +2418,7 @@ app.get("/users/:username", async (c) => {
   // ... omitted ...
   if (user == null) return c.notFound();
 
-  // biome-ignore lint/style/noNonNullAssertion: Always returns a single record
+  // oxlint-disable-next-line typescript/no-non-null-assertion -- Always returns a single record
   const { followers } = db
     .prepare<unknown[], { followers: number }>(
       `
@@ -3025,7 +3026,7 @@ export const PostView: FC<PostViewProps> = ({ post }) => (
     <header>
       <ActorLink actor={post} />
     </header>
-    {/* biome-ignore lint/security/noDangerouslySetInnerHtml: */}
+    {/* oxlint-disable-next-line react/no-danger -- The post content is sanitized before storage */}
     <div dangerouslySetInnerHTML={{ __html: post.content }} />
     <footer>
       <a href={post.url ?? post.uri}>
@@ -3090,7 +3091,7 @@ app.get("/users/:username/posts/:id", (c) => {
     .get(c.req.param("username"), c.req.param("id"));
   if (post == null) return c.notFound();
 
-  // biome-ignore lint/style/noNonNullAssertion: Always returns a single record
+  // oxlint-disable-next-line typescript/no-non-null-assertion -- Always returns a single record
   const { followers } = db
     .prepare<unknown[], { followers: number }>(
       `
@@ -3494,7 +3495,7 @@ export const Home: FC<HomeProps> = ({ user }) => (
       {/* ... omitted ... */}
     </hgroup>
     <form method="post" action={`/users/${user.username}/following`}>
-      {/* biome-ignore lint/a11y/noRedundantRoles: PicoCSS requires role=group */}
+      {/* oxlint-disable-next-line jsx-a11y/no-redundant-roles -- PicoCSS requires role=group */}
       <fieldset role="group">
         <input
           type="text"
@@ -4026,7 +4027,7 @@ app.get("/users/:username", async (c) => {
   // ... omitted ...
   if (user == null) return c.notFound();
 
-  // biome-ignore lint/style/noNonNullAssertion: Always returns a single record
+  // oxlint-disable-next-line typescript/no-non-null-assertion -- Always returns a single record
   const { following } = db
     .prepare<unknown[], { following: number }>(
       `
@@ -4081,7 +4082,7 @@ app.get("/users/:username/posts/:id", (c) => {
   // ... omitted ...
   if (post == null) return c.notFound();
 
-  // biome-ignore lint/style/noNonNullAssertion: Always returns a single record
+  // oxlint-disable-next-line typescript/no-non-null-assertion -- Always returns a single record
   const { following, followers } = db
     .prepare<unknown[], { following: number; followers: number }>(
       `
diff --git a/docs/tutorial/threadiverse.md b/docs/tutorial/threadiverse.md
index 7b4850633..32575cae9 100644
--- a/docs/tutorial/threadiverse.md
+++ b/docs/tutorial/threadiverse.md
@@ -184,7 +184,8 @@ After a moment your working directory will contain something like this:
  -  *federation/* — ActivityPub server code
      -  *index.ts* — Fedify `Federation` instance
  -  *public/* — static assets served as-is
- -  *biome.json* — formatter and linter configuration
+ -  *.oxfmtrc.json* — formatter configuration
+ -  *.oxlintrc.json* — linter configuration
  -  *logging.ts* — logging setup
  -  *middleware.ts* — Next.js middleware that hands federation requests off
     to Fedify
@@ -248,81 +249,35 @@ Linux, you've hit the default `fs.inotify.max_user_instances` limit.
 Restarting `npm run dev` with `WATCHPACK_POLLING=true` in front of it makes
 Next.js fall back to polling-based file watching and sidesteps the problem.
 
-### Swapping ESLint for Biome
+### Checking formatting and linting
 
-The Next.js scaffold that `create-next-app` dropped into the project comes
-with [ESLint] for linting, while the Fedify side of the scaffold prefers
-[Biome].  `fedify init` tries to accommodate both by shipping them side by
-side, but that means you have to install two tools that disagree with each
-other on style.  Since Biome can do both the formatting *and* the linting we
-need, let's delete ESLint and let Biome run the whole show.
+The project already uses [Oxfmt] for formatting and [Oxlint] for linting.
+The generated *.oxlintrc.json* also loads Fedify's lint rules through
+`@fedify/lint/oxlint`, so there is no separate ESLint setup to remove.
 
-Open *biome.json* and turn the linter on with the recommended rule set:
-
-~~~~ json [biome.json]
-{
-  "$schema": "https://biomejs.dev/schemas/2.4.12/schema.json",
-  "assist": { "actions": { "source": { "organizeImports": "on" } } },
-  "formatter": {
-    "enabled": true,
-    "indentStyle": "space",
-    "indentWidth": 2
-  },
-  "linter": {
-    "enabled": true,
-    "rules": { "recommended": true }
-  },
-  "files": {
-    "includes": ["**", "!.next", "!node_modules", "!public"]
-  }
-}
-~~~~
-
-Delete the two ESLint configs:
-
-~~~~ sh
-rm eslint.config.mjs eslint.config.ts
-~~~~
-
-In *package.json*, drop the `eslint`, `eslint-config-next`, and `@fedify/lint`
-packages from `devDependencies`, and rewrite the `lint` and `format` scripts
-so they call Biome instead:
+The relevant *package.json* scripts look like this:
 
 ~~~~ json [package.json]
 "scripts": {
   "dev": "next dev",
   "build": "next build",
   "start": "next start",
-  "lint": "biome check",
-  "format": "biome check --write"
+  "format": "oxfmt",
+  "format:check": "oxfmt --check",
+  "lint": "oxlint ."
 },
 ~~~~
 
-Then reinstall dependencies so the lockfile reflects the smaller dep tree:
-
-~~~~ sh
-npm install
-~~~~
-
-From now on you can format and lint the whole project with a single command:
+Check the generated files now:
 
 ~~~~ sh
-npm run format
+npm run format:check
+npm run lint
 ~~~~
 
-Running it once right now flags two pre-existing issues in the
-*fedify init* output:
-
- -  *app/globals.css* uses Tailwind CSS directives (`@theme inline`, a
-    dark-mode media query) that Biome's CSS parser does not recognise
-    out of the box, so it emits a parse error and aborts formatting
-    for that file.  Ignore it for now; we replace *app/globals.css*
-    wholesale in the next chapter, which removes every Tailwind-specific
-    line, and the error goes away on its own.
- -  *federation/index.ts* imports `getLogger` from LogTape and assigns
-    the result to a `logger` constant, but nothing ever reads that
-    `logger`.  Biome's `noUnusedVariables` rule flags it.  Delete the
-    unused import and declaration:
+Oxlint may warn that *federation/index.ts* imports `getLogger` from LogTape
+and assigns the result to a `logger` constant, but nothing reads that
+`logger` yet.  Delete the unused import and declaration:
 
 ~~~~ typescript [federation/index.ts]
 import {
@@ -353,8 +308,8 @@ export default federation;
 
 We'll add logging back later when there's something worth logging.
 
-[ESLint]: https://eslint.org/
-[Biome]: https://biomejs.dev/
+[Oxfmt]: https://oxc.rs/docs/guide/usage/formatter/
+[Oxlint]: https://oxc.rs/docs/guide/usage/linter/
 
 
 Layout and navigation
diff --git a/packages/init/src/action/cleanup.ts b/packages/init/src/action/cleanup.ts
new file mode 100644
index 000000000..7069f160c
--- /dev/null
+++ b/packages/init/src/action/cleanup.ts
@@ -0,0 +1,53 @@
+import { readFile, rm, writeFile } from "node:fs/promises";
+import { join as joinPath } from "node:path";
+import { throwUnlessNotExists } from "../lib.ts";
+import type { InitCommandData, WebFrameworkInitializer } from "../types.ts";
+import { formatJson } from "../utils.ts";
+
+export async function cleanupScaffoldedFiles(
+  { dir, initializer }: InitCommandData,
+): Promise<void> {
+  await Promise.all(
+    (initializer.cleanupFiles ?? []).map((path) =>
+      rm(joinPath(dir, path), { force: true, recursive: true })
+    ),
+  );
+  await cleanupPackageJson(dir, initializer.cleanupPackageJson);
+}
+
+async function cleanupPackageJson(
+  dir: string,
+  cleanup: WebFrameworkInitializer["cleanupPackageJson"],
+): Promise<void> {
+  if (cleanup == null) return;
+  const path = joinPath(dir, "package.json");
+  const packageJson = await readPackageJson(path);
+  if (packageJson == null) return;
+
+  deleteKeys(packageJson.scripts, cleanup.scripts);
+  deleteKeys(packageJson.dependencies, cleanup.dependencies);
+  deleteKeys(packageJson.devDependencies, cleanup.devDependencies);
+
+  await writeFile(path, formatJson(packageJson));
+}
+
+async function readPackageJson(
+  path: string,
+): Promise<Record<string, unknown> | null> {
+  try {
+    return JSON.parse(await readFile(path, "utf8"));
+  } catch (error) {
+    throwUnlessNotExists(error);
+    return null;
+  }
+}
+
+function deleteKeys(
+  target: unknown,
+  keys: readonly string[] | undefined,
+): void {
+  if (target == null || typeof target !== "object" || keys == null) return;
+  for (const key of keys) {
+    Reflect.deleteProperty(target, key);
+  }
+}
diff --git a/packages/init/src/action/configs.test.ts b/packages/init/src/action/configs.test.ts
index 00ecba5c8..0318446e2 100644
--- a/packages/init/src/action/configs.test.ts
+++ b/packages/init/src/action/configs.test.ts
@@ -1,16 +1,22 @@
 import assert from "node:assert/strict";
-import { mkdtemp, readFile, rm } from "node:fs/promises";
+import { execFile } from "node:child_process";
+import { mkdtemp, readFile, rm, writeFile } from "node:fs/promises";
 import { tmpdir } from "node:os";
 import { join } from "node:path";
 import test from "node:test";
+import { promisify } from "node:util";
 import { message } from "@optique/core";
 import { kvStores, messageQueues } from "../lib.ts";
 import type { InitCommandData } from "../types.ts";
 import bareBonesDescription from "../webframeworks/bare-bones.ts";
+import nextDescription from "../webframeworks/next.ts";
 import nuxtDescription from "../webframeworks/nuxt.ts";
+import { cleanupScaffoldedFiles } from "./cleanup.ts";
 import { loadDenoConfig } from "./configs.ts";
 import { patchFiles } from "./patch.ts";
 
+const execFileAsync = promisify(execFile);
+
 function createInitData(): InitCommandData {
   const data = {
     command: "init",
@@ -104,8 +110,8 @@ test("loadDenoConfig keeps unstable.temporal before Deno 2.7.0", () => {
   }
 });
 
-test("patchFiles creates a Biome config matching the npm package version", async () => {
-  const dir = await mkdtemp(join(tmpdir(), "fedify-init-biome-"));
+test("patchFiles creates Oxfmt and Oxlint configs for npm projects", async () => {
+  const dir = await mkdtemp(join(tmpdir(), "fedify-init-oxc-"));
 
   try {
     const data = await createNpmInitData(dir);
@@ -114,22 +120,125 @@ test("patchFiles creates a Biome config matching the npm package version", async
     const packageJson = JSON.parse(
       await readFile(join(dir, "package.json"), "utf8"),
     ) as {
+      scripts?: Record<string, string>;
       devDependencies?: Record<string, string>;
     };
-    const biomeConfig = JSON.parse(
-      await readFile(join(dir, "biome.json"), "utf8"),
-    ) as Record<string, unknown>;
-
-    const biomeVersion = packageJson.devDependencies?.["@biomejs/biome"];
-    const schema = biomeConfig.$schema;
-    assert.ok(typeof biomeVersion === "string");
-    assert.ok(typeof schema === "string");
-    assert.equal(getSchemaVersion(schema), getPackageVersion(biomeVersion));
-    assert.equal(getOrganizeImportsSetting(biomeConfig), "on");
+    const oxfmtConfig = JSON.parse(
+      await readFile(join(dir, ".oxfmtrc.json"), "utf8"),
+    ) as {
+      $schema?: string;
+      ignorePatterns?: string[];
+      sortPackageJson?: boolean;
+      tabWidth?: number;
+    };
+    const oxlintConfig = JSON.parse(
+      await readFile(join(dir, ".oxlintrc.json"), "utf8"),
+    ) as {
+      ignorePatterns?: string[];
+      jsPlugins?: string[];
+      rules?: Record<string, string>;
+    };
+    const vscodeExtensions = JSON.parse(
+      await readFile(join(dir, ".vscode", "extensions.json"), "utf8"),
+    ) as {
+      recommendations?: string[];
+    };
+
+    assert.equal(packageJson.scripts?.format, "oxfmt");
+    assert.equal(packageJson.scripts?.["format:check"], "oxfmt --check");
+    assert.equal(packageJson.scripts?.lint, "oxlint .");
+    assert.ok(packageJson.devDependencies?.["@fedify/lint"]);
+    assert.ok(packageJson.devDependencies?.["oxfmt"]);
+    assert.ok(packageJson.devDependencies?.["oxlint"]);
+    assert.equal(packageJson.devDependencies?.["eslint"], undefined);
+    assert.equal(packageJson.devDependencies?.["@biomejs/biome"], undefined);
     assert.equal(
-      "organizeImports" in biomeConfig,
-      false,
+      oxfmtConfig.$schema,
+      "./node_modules/oxfmt/configuration_schema.json",
     );
+    assert.equal(oxfmtConfig.sortPackageJson, false);
+    assert.equal(oxfmtConfig.tabWidth, 2);
+    assert.ok(oxfmtConfig.ignorePatterns?.includes("node_modules/**"));
+    assert.ok(oxfmtConfig.ignorePatterns?.includes("**/*.md"));
+    assert.ok(oxlintConfig.ignorePatterns?.includes("node_modules/**"));
+    assert.deepEqual(oxlintConfig.jsPlugins, ["@fedify/lint/oxlint"]);
+    assert.equal(
+      oxlintConfig.rules?.["@fedify/lint/actor-id-required"],
+      "error",
+    );
+    assert.equal(
+      oxlintConfig.rules?.["@fedify/lint/actor-outbox-property-required"],
+      "warn",
+    );
+    assert.deepEqual(vscodeExtensions.recommendations, ["oxc.oxc-vscode"]);
+    await assert.rejects(readFile(join(dir, "biome.json"), "utf8"), {
+      code: "ENOENT",
+    });
+    await assert.rejects(readFile(join(dir, "eslint.config.ts"), "utf8"), {
+      code: "ENOENT",
+    });
+  } finally {
+    await rm(dir, { recursive: true, force: true });
+  }
+});
+
+test("patchFiles keeps generated Deno federation file formatted", async () => {
+  const dir = await mkdtemp(join(tmpdir(), "fedify-init-deno-fmt-"));
+
+  try {
+    const data = await createDenoInitData(dir);
+    await patchFiles(data);
+
+    await execFileAsync("deno", [
+      "fmt",
+      "--check",
+      join(dir, "src", "federation.ts"),
+    ]);
+  } finally {
+    await rm(dir, { recursive: true, force: true });
+  }
+});
+
+test("cleanupScaffoldedFiles removes Next.js ESLint artifacts", async () => {
+  const dir = await mkdtemp(join(tmpdir(), "fedify-init-next-cleanup-"));
+
+  try {
+    const data = await createNextNpmInitData(dir);
+    await writeFile(join(dir, "eslint.config.mjs"), "export default [];\n");
+    await writeFile(
+      join(dir, "package.json"),
+      JSON.stringify({
+        scripts: {
+          dev: "next dev",
+          lint: "eslint",
+        },
+        devDependencies: {
+          eslint: "^9",
+          "eslint-config-next": "16.2.9",
+          typescript: "^5",
+        },
+      }),
+    );
+
+    await cleanupScaffoldedFiles(data);
+
+    const packageJson = JSON.parse(
+      await readFile(join(dir, "package.json"), "utf8"),
+    ) as {
+      scripts?: Record<string, string>;
+      devDependencies?: Record<string, string>;
+    };
+    assert.equal(packageJson.scripts?.dev, "next dev");
+    assert.equal(packageJson.scripts?.lint, undefined);
+    assert.equal(packageJson.devDependencies?.eslint, undefined);
+    assert.equal(
+      packageJson.devDependencies?.["eslint-config-next"],
+      undefined,
+    );
+    assert.equal(packageJson.devDependencies?.typescript, "^5");
+    await assert.rejects(readFile(join(dir, "eslint.config.mjs"), "utf8"), {
+      code: "ENOENT",
+    });
   } finally {
     await rm(dir, { recursive: true, force: true });
   }
@@ -192,12 +301,12 @@ async function createNpmInitData(dir: string): Promise<InitCommandData> {
   return data;
 }
 
-async function createNuxtNpmInitData(dir: string): Promise<InitCommandData> {
-  const initializer = await nuxtDescription.init({
+async function createDenoInitData(dir: string): Promise<InitCommandData> {
+  const initializer = await bareBonesDescription.init({
     command: "init",
     projectName: "example",
-    packageManager: "npm",
-    webFramework: "nuxt",
+    packageManager: "deno",
+    webFramework: "bare-bones",
     kvStore: "in-memory",
     messageQueue: "in-process",
     dryRun: false,
@@ -210,8 +319,8 @@ async function createNuxtNpmInitData(dir: string): Promise<InitCommandData> {
   const data = {
     command: "init",
     projectName: "example",
-    packageManager: "npm",
-    webFramework: "nuxt",
+    packageManager: "deno",
+    webFramework: "bare-bones",
     kvStore: "in-memory",
     messageQueue: "in-process",
     dryRun: false,
@@ -227,28 +336,72 @@ async function createNuxtNpmInitData(dir: string): Promise<InitCommandData> {
   return data;
 }
 
-function getSchemaVersion(schema: string): string {
-  const match = schema.match(/\/schemas\/(\d+\.\d+\.\d+)\//);
-  assert.ok(match, `Unexpected Biome schema URL: ${schema}`);
-  return match[1];
-}
+async function createNextNpmInitData(dir: string): Promise<InitCommandData> {
+  const initializer = await nextDescription.init({
+    command: "init",
+    projectName: "example",
+    packageManager: "npm",
+    webFramework: "next",
+    kvStore: "in-memory",
+    messageQueue: "in-process",
+    dryRun: false,
+    allowNonEmpty: false,
+    skipInstall: false,
+    testMode: false,
+    dir,
+  });
 
-function getPackageVersion(version: string): string {
-  const match = version.match(/\d+\.\d+\.\d+/);
-  assert.ok(match, `Unexpected Biome package version: ${version}`);
-  return match[0];
+  const data = {
+    command: "init",
+    projectName: "example",
+    packageManager: "npm",
+    webFramework: "next",
+    kvStore: "in-memory",
+    messageQueue: "in-process",
+    dryRun: false,
+    allowNonEmpty: false,
+    skipInstall: false,
+    testMode: false,
+    dir,
+    initializer,
+    kv: kvStores["in-memory"],
+    mq: messageQueues["in-process"],
+    env: {},
+  } satisfies InitCommandData;
+  return data;
 }
 
-function getOrganizeImportsSetting(config: Record<string, unknown>): unknown {
-  const assist = config.assist;
-  assert.ok(isRecord(assist));
-  const actions = assist.actions;
-  assert.ok(isRecord(actions));
-  const source = actions.source;
-  assert.ok(isRecord(source));
-  return source.organizeImports;
-}
+async function createNuxtNpmInitData(dir: string): Promise<InitCommandData> {
+  const initializer = await nuxtDescription.init({
+    command: "init",
+    projectName: "example",
+    packageManager: "npm",
+    webFramework: "nuxt",
+    kvStore: "in-memory",
+    messageQueue: "in-process",
+    dryRun: false,
+    allowNonEmpty: false,
+    skipInstall: false,
+    testMode: false,
+    dir,
+  });
 
-function isRecord(value: unknown): value is Record<string, unknown> {
-  return typeof value === "object" && value != null;
+  const data = {
+    command: "init",
+    projectName: "example",
+    packageManager: "npm",
+    webFramework: "nuxt",
+    kvStore: "in-memory",
+    messageQueue: "in-process",
+    dryRun: false,
+    allowNonEmpty: false,
+    skipInstall: false,
+    testMode: false,
+    dir,
+    initializer,
+    kv: kvStores["in-memory"],
+    mq: messageQueues["in-process"],
+    env: {},
+  } satisfies InitCommandData;
+  return data;
 }
diff --git a/packages/init/src/action/configs.ts b/packages/init/src/action/configs.ts
index 17689d7ca..da8590123 100644
--- a/packages/init/src/action/configs.ts
+++ b/packages/init/src/action/configs.ts
@@ -21,7 +21,8 @@ import { getLogger } from "@logtape/logtape";
 import { execFileSync } from "node:child_process";
 import { realpathSync } from "node:fs";
 import { join as joinPath, relative } from "node:path";
-import biome from "../json/biome.json" with { type: "json" };
+import oxfmt from "../json/oxfmt.json" with { type: "json" };
+import oxlint from "../json/oxlint.json" with { type: "json" };
 import vscodeSettingsForDeno from "../json/vscode-settings-for-deno.json" with {
   type: "json",
 };
@@ -175,13 +176,17 @@ export const loadPackageJson = (
  * based on the project type (Node.js/Bun or Deno).
  */
 export const devToolConfigs = {
-  biome: {
-    path: joinPath("biome.json"),
-    data: biome,
+  oxfmt: {
+    path: joinPath(".oxfmtrc.json"),
+    data: oxfmt,
+  },
+  oxlint: {
+    path: joinPath(".oxlintrc.json"),
+    data: oxlint,
   },
   vscExt: {
     path: joinPath(".vscode", "extensions.json"),
-    data: { recommendations: ["biomejs.biome", "dbaeumer.vscode-eslint"] },
+    data: { recommendations: ["oxc.oxc-vscode"] },
   },
   vscSet: {
     path: joinPath(".vscode", "settings.json"),
diff --git a/packages/init/src/action/deps.ts b/packages/init/src/action/deps.ts
index bf36516cd..4cec3b85c 100644
--- a/packages/init/src/action/deps.ts
+++ b/packages/init/src/action/deps.ts
@@ -77,7 +77,7 @@ const convertFedifyToLocal = (name: string): string =>
 
 /** Gathers all devDependencies required for the project based on the
  * initializer, key-value store, and message queue configurations,
- * including Biome for linting/formatting.
+ * including Oxfmt and Oxlint for formatting and linting.
  *
  * @param data - Web Framework initializer, key-value store
  *               and message queue descriptions
diff --git a/packages/init/src/action/mod.ts b/packages/init/src/action/mod.ts
index e552df816..a9d29f1b7 100644
--- a/packages/init/src/action/mod.ts
+++ b/packages/init/src/action/mod.ts
@@ -4,6 +4,7 @@ import askOptions from "../ask/mod.ts";
 import type { InitCommand } from "../command.ts";
 import type { InitCommandData } from "../types.ts";
 import { set } from "../utils.ts";
+import { cleanupScaffoldedFiles } from "./cleanup.ts";
 import { makeDirIfHyd } from "./dir.ts";
 import recommendConfigEnv from "./env.ts";
 import {
@@ -79,6 +80,7 @@ const handleHydRun = (data: InitCommandData) =>
     tap(makeDirIfHyd),
     tap(assertNoGeneratedFileConflicts),
     tap(when(hasCommand, runPrecommand)),
+    tap(cleanupScaffoldedFiles),
     tap(patchFiles),
     tap(unless(isSkipInstall, installDependencies)),
     tap(when(isSkipInstall, noticeSkippedInstall)),
diff --git a/packages/init/src/action/patch.ts b/packages/init/src/action/patch.ts
index 036242462..09b1f4dd3 100644
--- a/packages/init/src/action/patch.ts
+++ b/packages/init/src/action/patch.ts
@@ -154,7 +154,8 @@ const getJsons = <
         ? { "tsconfig.json": loadTsConfig(data).data }
         : {}),
       "package.json": loadPackageJson(data).data,
-      [devToolConfigs["biome"].path]: devToolConfigs["biome"].data,
+      [devToolConfigs["oxfmt"].path]: devToolConfigs["oxfmt"].data,
+      [devToolConfigs["oxlint"].path]: devToolConfigs["oxlint"].data,
       [devToolConfigs["vscSet"].path]: devToolConfigs["vscSet"].data,
       [devToolConfigs["vscExt"].path]: devToolConfigs["vscExt"].data,
     };
diff --git a/packages/init/src/action/templates.ts b/packages/init/src/action/templates.ts
index 6e2887e3a..f8a0ed773 100644
--- a/packages/init/src/action/templates.ts
+++ b/packages/init/src/action/templates.ts
@@ -24,13 +24,18 @@ export const loadFederation = async (
   }: InitCommandData & { imports: string },
 ) =>
   pipe(
-    await readTemplate("defaults/federation.ts"),
+    await readTemplate(getFederationTemplate(packageManager)),
     replace(/\/\* imports \*\//, imports),
     replace(/\/\* logger \*\//, JSON.stringify(projectName)),
     replace(/\/\* kv \*\//, convertEnv(kv.object, packageManager)),
     replace(/\/\* queue \*\//, convertEnv(mq.object, packageManager)),
   );
 
+const getFederationTemplate = (packageManager: PackageManager): string =>
+  packageManager === "deno"
+    ? "defaults/federation.ts"
+    : "defaults/federation.oxc.ts";
+
 /**
  * Loads logging configuration file content for the initializer.
  *
@@ -95,12 +100,10 @@ export const getImports = ({ kv, mq, packageManager, env }: InitCommandData) =>
  * @returns A comma-separated string of named imports with aliases where needed
  */
 export const getAlias = (imports: Record<string, string>) =>
-  pipe(
-    imports,
-    entries,
-    map(([name, alias]) => name === alias ? name : `${name} as ${alias}`),
-    join(", "),
-  );
+  Object.entries(imports)
+    .map(([name, alias]) => name === alias ? name : `${name} as ${alias}`)
+    .sort()
+    .join(", ");
 
 const ENV_REG_EXP = /process\.env\.(\w+)/g;
 /**
diff --git a/packages/init/src/json/biome.json b/packages/init/src/json/biome.json
deleted file mode 100644
index 2753ca99f..000000000
--- a/packages/init/src/json/biome.json
+++ /dev/null
@@ -1,19 +0,0 @@
-{
-  "$schema": "https://biomejs.dev/schemas/2.4.9/schema.json",
-  "assist": {
-    "enabled": true,
-    "actions": {
-      "source": {
-        "organizeImports": "on"
-      }
-    }
-  },
-  "formatter": {
-    "enabled": true,
-    "indentStyle": "space",
-    "indentWidth": 2
-  },
-  "linter": {
-    "enabled": false
-  }
-}
diff --git a/packages/init/src/json/deps.json b/packages/init/src/json/deps.json
index c68f08a77..3dd36421d 100644
--- a/packages/init/src/json/deps.json
+++ b/packages/init/src/json/deps.json
@@ -4,7 +4,6 @@
   "@logtape/logtape": "^2.2.0",
   "@std/dotenv": "^0.225.6",
   "npm:@astrojs/node": "^10.0.4",
-  "npm:@biomejs/biome": "^2.4.9",
   "npm:@deno/astro-adapter": "^0.3.2",
   "npm:@dotenvx/dotenvx": "^1.59.1",
   "npm:@elysiajs/node": "^1.4.5",
@@ -21,13 +20,14 @@
   "npm:@types/node@25": "^25.5.0",
   "npm:astro": "^6.1.1",
   "npm:elysia": "^1.4.28",
-  "npm:eslint": "^9.0.0",
   "npm:express": "^5.2.1",
   "npm:h3": "^1.15.0",
   "npm:hono": "^4.12.9",
   "npm:nuxi": "^3.34.0",
   "npm:nuxt": "^4.4.2",
   "npm:openapi-types": "^12.1.3",
+  "npm:oxfmt": "^0.56.0",
+  "npm:oxlint": "^1.71.0",
   "npm:solid-js": "^1.9.12",
   "npm:tsx": "^4.21.0",
   "npm:typescript": "^5.9.3",
diff --git a/packages/init/src/json/oxfmt.json b/packages/init/src/json/oxfmt.json
new file mode 100644
index 000000000..f916eac05
--- /dev/null
+++ b/packages/init/src/json/oxfmt.json
@@ -0,0 +1,17 @@
+{
+  "$schema": "./node_modules/oxfmt/configuration_schema.json",
+  "ignorePatterns": [
+    ".next/**",
+    ".output/**",
+    ".solid/**",
+    ".vinxi/**",
+    "**/*.md",
+    "build/**",
+    "coverage/**",
+    "dist/**",
+    "node_modules/**"
+  ],
+  "sortPackageJson": false,
+  "tabWidth": 2,
+  "useTabs": false
+}
diff --git a/packages/init/src/json/oxlint.json b/packages/init/src/json/oxlint.json
new file mode 100644
index 000000000..8aafbd594
--- /dev/null
+++ b/packages/init/src/json/oxlint.json
@@ -0,0 +1,40 @@
+{
+  "$schema": "https://raw.githubusercontent.com/oxc-project/oxc/main/npm/oxlint/configuration_schema.json",
+  "ignorePatterns": [
+    ".next/**",
+    ".output/**",
+    ".solid/**",
+    ".vinxi/**",
+    "build/**",
+    "coverage/**",
+    "dist/**",
+    "node_modules/**"
+  ],
+  "jsPlugins": [
+    "@fedify/lint/oxlint"
+  ],
+  "rules": {
+    "@fedify/lint/actor-id-mismatch": "error",
+    "@fedify/lint/actor-id-required": "error",
+    "@fedify/lint/actor-following-property-required": "warn",
+    "@fedify/lint/actor-following-property-mismatch": "warn",
+    "@fedify/lint/actor-followers-property-required": "warn",
+    "@fedify/lint/actor-followers-property-mismatch": "warn",
+    "@fedify/lint/actor-outbox-property-required": "warn",
+    "@fedify/lint/actor-outbox-property-mismatch": "warn",
+    "@fedify/lint/actor-liked-property-required": "warn",
+    "@fedify/lint/actor-liked-property-mismatch": "warn",
+    "@fedify/lint/actor-featured-property-required": "warn",
+    "@fedify/lint/actor-featured-property-mismatch": "warn",
+    "@fedify/lint/actor-featured-tags-property-required": "warn",
+    "@fedify/lint/actor-featured-tags-property-mismatch": "warn",
+    "@fedify/lint/actor-inbox-property-required": "warn",
+    "@fedify/lint/actor-inbox-property-mismatch": "warn",
+    "@fedify/lint/actor-shared-inbox-property-required": "warn",
+    "@fedify/lint/actor-shared-inbox-property-mismatch": "warn",
+    "@fedify/lint/actor-public-key-required": "warn",
+    "@fedify/lint/actor-assertion-method-required": "warn",
+    "@fedify/lint/collection-filtering-not-implemented": "warn",
+    "@fedify/lint/outbox-listener-delivery-required": "warn"
+  }
+}
diff --git a/packages/init/src/json/vscode-settings.json b/packages/init/src/json/vscode-settings.json
index 10c007420..21439fbd8 100644
--- a/packages/init/src/json/vscode-settings.json
+++ b/packages/init/src/json/vscode-settings.json
@@ -2,40 +2,41 @@
   "editor.detectIndentation": false,
   "editor.indentSize": 2,
   "editor.insertSpaces": true,
+  "oxc.fmt.configPath": ".oxfmtrc.json",
   "[javascript]": {
-    "editor.defaultFormatter": "biomejs.biome",
+    "editor.defaultFormatter": "oxc.oxc-vscode",
     "editor.formatOnSave": true,
     "editor.codeActionsOnSave": {
-      "source.organizeImports.biome": "always"
+      "source.fixAll.oxc": "always"
     }
   },
   "[javascriptreact]": {
-    "editor.defaultFormatter": "biomejs.biome",
+    "editor.defaultFormatter": "oxc.oxc-vscode",
     "editor.formatOnSave": true,
     "editor.codeActionsOnSave": {
-      "source.organizeImports.biome": "always"
+      "source.fixAll.oxc": "always"
     }
   },
   "[json]": {
-    "editor.defaultFormatter": "biomejs.biome",
+    "editor.defaultFormatter": "oxc.oxc-vscode",
     "editor.formatOnSave": true
   },
   "[jsonc]": {
-    "editor.defaultFormatter": "biomejs.biome",
+    "editor.defaultFormatter": "oxc.oxc-vscode",
     "editor.formatOnSave": true
   },
   "[typescript]": {
-    "editor.defaultFormatter": "biomejs.biome",
+    "editor.defaultFormatter": "oxc.oxc-vscode",
     "editor.formatOnSave": true,
     "editor.codeActionsOnSave": {
-      "source.organizeImports.biome": "always"
+      "source.fixAll.oxc": "always"
     }
   },
   "[typescriptreact]": {
-    "editor.defaultFormatter": "biomejs.biome",
+    "editor.defaultFormatter": "oxc.oxc-vscode",
     "editor.formatOnSave": true,
     "editor.codeActionsOnSave": {
-      "source.organizeImports.biome": "always"
+      "source.fixAll.oxc": "always"
     }
   }
 }
diff --git a/packages/init/src/templates/bare-bones/main/bun.ts.tpl b/packages/init/src/templates/bare-bones/main/bun.ts.tpl
index d68ef5b54..e6a17aa30 100644
--- a/packages/init/src/templates/bare-bones/main/bun.ts.tpl
+++ b/packages/init/src/templates/bare-bones/main/bun.ts.tpl
@@ -7,9 +7,9 @@ const server = Bun.serve({
   fetch: behindProxy((req) =>
     new URL(req.url).pathname === "/"
       ? new Response("Hello, this is a Fedify server!", {
-        headers: { "Content-Type": "text/plain" },
-      })
-      : federation.fetch(req, { contextData: undefined })
+          headers: { "Content-Type": "text/plain" },
+        })
+      : federation.fetch(req, { contextData: undefined }),
   ),
 });
 
diff --git a/packages/init/src/templates/bare-bones/main/node.ts.tpl b/packages/init/src/templates/bare-bones/main/node.ts.tpl
index fc65e76b1..79e211fb9 100644
--- a/packages/init/src/templates/bare-bones/main/node.ts.tpl
+++ b/packages/init/src/templates/bare-bones/main/node.ts.tpl
@@ -7,13 +7,12 @@ serve(
   {
     port: 8000,
     fetch: behindProxy((req) =>
-    new URL(req.url).pathname === "/"
-      ? new Response("Hello, this is a Fedify server!", {
-        headers: { "Content-Type": "text/plain" },
-      })
-      : federation.fetch(req, { contextData: undefined })
-  ),
+      new URL(req.url).pathname === "/"
+        ? new Response("Hello, this is a Fedify server!", {
+            headers: { "Content-Type": "text/plain" },
+          })
+        : federation.fetch(req, { contextData: undefined }),
+    ),
   },
-  (info) =>
-    console.log("Server started at http://" + info.address + ":" + info.port)
+  (info) => console.log("Server started at http://" + info.address + ":" + info.port),
 );
diff --git a/packages/init/src/templates/defaults/eslint.config.ts.tpl b/packages/init/src/templates/defaults/eslint.config.ts.tpl
deleted file mode 100644
index 9ac90a302..000000000
--- a/packages/init/src/templates/defaults/eslint.config.ts.tpl
+++ /dev/null
@@ -1,3 +0,0 @@
-import fedifyLint from "@fedify/lint";
-
-export default fedifyLint;
diff --git a/packages/init/src/templates/defaults/federation.oxc.ts.tpl b/packages/init/src/templates/defaults/federation.oxc.ts.tpl
new file mode 100644
index 000000000..b9441f1b8
--- /dev/null
+++ b/packages/init/src/templates/defaults/federation.oxc.ts.tpl
@@ -0,0 +1,21 @@
+import { createFederation } from "@fedify/fedify";
+import { Person } from "@fedify/vocab";
+import { getLogger } from "@logtape/logtape";
+/* imports */
+
+const logger = getLogger(/* logger */);
+
+const federation = createFederation({
+  kv: /* kv */,
+  queue: /* queue */,
+});
+
+federation.setActorDispatcher("/users/{identifier}", async (ctx, identifier) => {
+  return new Person({
+    id: ctx.getActorUri(identifier),
+    preferredUsername: identifier,
+    name: identifier,
+  });
+});
+
+export default federation;
diff --git a/packages/init/src/templates/elysia/index/bun.ts.tpl b/packages/init/src/templates/elysia/index/bun.ts.tpl
index a876ae50f..107251bb7 100644
--- a/packages/init/src/templates/elysia/index/bun.ts.tpl
+++ b/packages/init/src/templates/elysia/index/bun.ts.tpl
@@ -10,4 +10,4 @@ app
   .get("/", () => "Hello, Fedify!")
   .listen(3000, () => {
     console.log("Server started at http://localhost:3000");
-  })
+  });
diff --git a/packages/init/src/templates/elysia/index/node.ts.tpl b/packages/init/src/templates/elysia/index/node.ts.tpl
index 04a5ed6fa..3da3e9503 100644
--- a/packages/init/src/templates/elysia/index/node.ts.tpl
+++ b/packages/init/src/templates/elysia/index/node.ts.tpl
@@ -1,8 +1,8 @@
 import { fedify } from "@fedify/elysia";
+import { node } from "@elysiajs/node";
 import { Elysia } from "elysia";
 import federation from "./federation.ts";
 import "./logging.ts";
-import { node } from '@elysiajs/node'
 
 const app = new Elysia({ adapter: node() });
 
@@ -11,4 +11,4 @@ app
   .get("/", () => "Hello, Fedify!")
   .listen(3000, () => {
     console.log("Server started at http://localhost:3000");
-  })
+  });
diff --git a/packages/init/src/templates/hono/index/node.ts.tpl b/packages/init/src/templates/hono/index/node.ts.tpl
index b390cb646..85462bb5a 100644
--- a/packages/init/src/templates/hono/index/node.ts.tpl
+++ b/packages/init/src/templates/hono/index/node.ts.tpl
@@ -9,6 +9,5 @@ serve(
     port: 8000,
     fetch: behindProxy(app.fetch.bind(app)),
   },
-  (info) =>
-    console.log("Server started at http://" + info.address + ":" + info.port),
+  (info) => console.log("Server started at http://" + info.address + ":" + info.port),
 );
diff --git a/packages/init/src/templates/next/middleware.ts.tpl b/packages/init/src/templates/next/middleware.ts.tpl
index 7ccd13ca2..4ee86c6dd 100644
--- a/packages/init/src/templates/next/middleware.ts.tpl
+++ b/packages/init/src/templates/next/middleware.ts.tpl
@@ -2,7 +2,7 @@ import { fedifyWith } from "@fedify/next";
 import federation from "./federation";
 
 export default fedifyWith(federation)(
-/*
+  /*
   function (request: Request) {
     // If you need to handle other requests besides federation
     // requests in middleware, you can do it here.
@@ -11,7 +11,7 @@ export default fedifyWith(federation)(
     return NextResponse.next();
   },
 */
-)
+);
 
 // This config needs because middleware process only requests with the
 // "Accept" header matching the federation accept regex.
@@ -42,4 +42,4 @@ export const config = {
     { source: "/.well-known/nodeinfo" },
     { source: "/.well-known/x-nodeinfo2" },
   ],
-};
\ No newline at end of file
+};
diff --git a/packages/init/src/templates/nitro/nitro.config.ts.tpl b/packages/init/src/templates/nitro/nitro.config.ts.tpl
index 942c9d5a9..c0236f290 100644
--- a/packages/init/src/templates/nitro/nitro.config.ts.tpl
+++ b/packages/init/src/templates/nitro/nitro.config.ts.tpl
@@ -1,4 +1,4 @@
-import { defineNitroConfig } from "nitropack/config"
+import { defineNitroConfig } from "nitropack/config";
 
 // https://nitro.build/config
 export default defineNitroConfig({
@@ -10,5 +10,5 @@ export default defineNitroConfig({
   },
   compatibilityDate: "latest",
   srcDir: "server",
-  imports: false
+  imports: false,
 });
diff --git a/packages/init/src/templates/nitro/server/error.ts.tpl b/packages/init/src/templates/nitro/server/error.ts.tpl
index cbbe5886a..e67bcaacb 100644
--- a/packages/init/src/templates/nitro/server/error.ts.tpl
+++ b/packages/init/src/templates/nitro/server/error.ts.tpl
@@ -1,3 +1,3 @@
 import { onError } from "@fedify/h3";
 
-export default onError;
\ No newline at end of file
+export default onError;
diff --git a/packages/init/src/templates/nitro/server/middleware/federation.ts.tpl b/packages/init/src/templates/nitro/server/middleware/federation.ts.tpl
index a59ef219e..5f2e16093 100644
--- a/packages/init/src/templates/nitro/server/middleware/federation.ts.tpl
+++ b/packages/init/src/templates/nitro/server/middleware/federation.ts.tpl
@@ -1,8 +1,4 @@
-
 import { integrateFederation } from "@fedify/h3";
-import federation from "../federation"
+import federation from "../federation";
 
-export default integrateFederation(
-  federation,
-  (event, request) => undefined,
-);
\ No newline at end of file
+export default integrateFederation(federation, (event, request) => undefined);
diff --git a/packages/init/src/templates/nitro/server/routes/index.ts.tpl b/packages/init/src/templates/nitro/server/routes/index.ts.tpl
new file mode 100644
index 000000000..8b0478601
--- /dev/null
+++ b/packages/init/src/templates/nitro/server/routes/index.ts.tpl
@@ -0,0 +1,11 @@
+import { eventHandler } from "h3";
+
+// Learn more: https://nitro.build/guide/routing
+export default eventHandler(() => {
+  return `
+      <meta charset="utf-8">
+      <h1>This is your brand new Nitro project</h1>
+      <p>Get started by editing the <code>server/routes/index.ts</code> file.</p>
+      <p>Learn more from <a href="https://nitro.build/guide" target="_blank">Nitro Documentation</a></p>
+    `;
+});
diff --git a/packages/init/src/test/create.ts b/packages/init/src/test/create.ts
index 034e690fc..e63498ce8 100644
--- a/packages/init/src/test/create.ts
+++ b/packages/init/src/test/create.ts
@@ -38,6 +38,13 @@ async (
     .spawn();
   await saveOutputs(testDir, result);
   if (result.code === 0) {
+    if (!dry && !(await validateDevToolScripts(testDir, options))) {
+      printMessage`  Fail: ${vals}`;
+      printMessage`    Check out these files for more details: \
+${join(testDir, "out.txt")} and \
+${join(testDir, "err.txt")}\n`;
+      return "";
+    }
     printMessage`  Pass: ${vals}`;
     return testDir;
   }
@@ -112,6 +119,32 @@ const saveOutputs = async (
   if (stderr) await appendFile(join(dirPath, "err.txt"), stderr + "\n", "utf8");
 };
 
+async function validateDevToolScripts(
+  dir: string,
+  options: GeneratedType<ReturnType<typeof generateTestCases>>,
+): Promise<boolean> {
+  const [, packageManager] = options as [
+    WebFramework,
+    PackageManager,
+    KvStore,
+    MessageQueue,
+  ];
+  if (packageManager === "deno") return true;
+
+  for (const script of ["format:check", "lint"]) {
+    const result = await $`${[packageManager, "run", script]}`
+      .cwd(dir)
+      .stdin("null")
+      .stdout("piped")
+      .stderr("piped")
+      .noThrow()
+      .spawn();
+    await saveOutputs(dir, result);
+    if (result.code !== 0) return false;
+  }
+  return true;
+}
+
 export function filterOptions(
   options: GeneratedType<ReturnType<typeof generateTestCases>>,
 ): boolean {
diff --git a/packages/init/src/types.ts b/packages/init/src/types.ts
index 2e61c2ebe..06181fab3 100644
--- a/packages/init/src/types.ts
+++ b/packages/init/src/types.ts
@@ -70,6 +70,14 @@ export interface PackageManagerDescription {
 export interface WebFrameworkInitializer {
   /** Optional shell command to run before scaffolding (e.g., `create-next-app`). */
   command?: string[];
+  /** Files from a framework scaffolder to remove before Fedify writes files. */
+  cleanupFiles?: string[];
+  /** package.json entries from a framework scaffolder to remove before merging. */
+  cleanupPackageJson?: {
+    scripts?: string[];
+    dependencies?: string[];
+    devDependencies?: string[];
+  };
   /** Runtime dependencies to install (package name to version). */
   dependencies?: Record<string, string>;
   /** Development-only dependencies to install (package name to version). */
diff --git a/packages/init/src/utils.ts b/packages/init/src/utils.ts
index 557ea059a..ee75e5a7f 100644
--- a/packages/init/src/utils.ts
+++ b/packages/init/src/utils.ts
@@ -85,7 +85,59 @@ export const replaceAll = (
 (text: string): string => text.replaceAll(pattern, replacement as string);
 
 /** Serializes a value to a pretty-printed JSON string with a trailing newline. */
-export const formatJson = (obj: unknown) => JSON.stringify(obj, null, 2) + "\n";
+export const formatJson = (obj: unknown) => formatJsonValue(obj, 0) + "\n";
+
+function formatJsonValue(value: unknown, depth: number): string {
+  if (Array.isArray(value)) return formatJsonArray(value, depth);
+  if (value !== null && typeof value === "object") {
+    return formatJsonObject(value as Record<string, unknown>, depth);
+  }
+  return formatJsonPrimitive(value);
+}
+
+function formatJsonArray(values: unknown[], depth: number): string {
+  if (values.length === 0) return "[]";
+  const canCompact = values.every((value) =>
+    value == null || typeof value !== "object"
+  );
+  const compact = canCompact
+    ? `[${values.map(formatJsonPrimitive).join(", ")}]`
+    : "";
+  if (
+    canCompact &&
+    compact.length <= 80
+  ) {
+    return compact;
+  }
+  const childIndent = indent(depth + 1);
+  return `[\n${
+    values.map((value) => `${childIndent}${formatJsonValue(value, depth + 1)}`)
+      .join(",\n")
+  }\n${indent(depth)}]`;
+}
+
+function formatJsonObject(
+  object: Record<string, unknown>,
+  depth: number,
+): string {
+  const entries = Object.entries(object).filter(([, value]) =>
+    value !== undefined
+  );
+  if (entries.length === 0) return "{}";
+  const childIndent = indent(depth + 1);
+  return `{\n${
+    entries.map(([key, value]) =>
+      `${childIndent}${JSON.stringify(key)}: ${
+        formatJsonValue(value, depth + 1)
+      }`
+    ).join(",\n")
+  }\n${indent(depth)}}`;
+}
+
+const indent = (depth: number): string => "  ".repeat(depth);
+
+const formatJsonPrimitive = (value: unknown): string =>
+  JSON.stringify(value) ?? "null";
 
 /** Checks whether a string or array-like value has a length greater than zero. */
 export const notEmpty = <T extends string | { length: number }>(s: T) =>
diff --git a/packages/init/src/webframeworks.test.ts b/packages/init/src/webframeworks.test.ts
index e0b1c1bee..fc49566fb 100644
--- a/packages/init/src/webframeworks.test.ts
+++ b/packages/init/src/webframeworks.test.ts
@@ -1,8 +1,9 @@
-import { ok } from "node:assert/strict";
+import { equal, ok } from "node:assert/strict";
 import test from "node:test";
 import astroDescription from "./webframeworks/astro.ts";
 import nextDescription from "./webframeworks/next.ts";
 import nitroDescription from "./webframeworks/nitro.ts";
+import webFrameworks from "./webframeworks/mod.ts";
 import solidstartDescription from "./webframeworks/solidstart.ts";
 
 test("Nitro template loads LogTape during server startup", async () => {
@@ -92,3 +93,34 @@ test("SolidStart template loads LogTape through middleware", async () => {
   ok(middleware);
   ok(middleware.includes('import "../logging";'));
 });
+
+test("Node.js and Bun templates use Oxfmt and Oxlint", async () => {
+  for (const [webFramework, description] of Object.entries(webFrameworks)) {
+    for (const packageManager of ["npm", "bun"] as const) {
+      if (!description.packageManagers.includes(packageManager)) continue;
+      const initializer = await description.init({
+        projectName: "test-app",
+        dir: ".",
+        command: "init",
+        packageManager,
+        kvStore: "in-memory",
+        messageQueue: "in-process",
+        webFramework: webFramework as keyof typeof webFrameworks,
+        testMode: false,
+        dryRun: true,
+        allowNonEmpty: false,
+        skipInstall: false,
+      });
+
+      equal(initializer.tasks?.format, "oxfmt");
+      equal(initializer.tasks?.["format:check"], "oxfmt --check");
+      equal(initializer.tasks?.lint, "oxlint .");
+      equal(initializer.files?.["eslint.config.ts"], undefined);
+      equal(initializer.devDependencies?.["@fedify/lint"] != null, true);
+      equal(initializer.devDependencies?.["oxfmt"] != null, true);
+      equal(initializer.devDependencies?.["oxlint"] != null, true);
+      equal(initializer.devDependencies?.["eslint"], undefined);
+      equal(initializer.devDependencies?.["@biomejs/biome"], undefined);
+    }
+  }
+});
diff --git a/packages/init/src/webframeworks/astro.ts b/packages/init/src/webframeworks/astro.ts
index ecf32a7eb..b511afd84 100644
--- a/packages/init/src/webframeworks/astro.ts
+++ b/packages/init/src/webframeworks/astro.ts
@@ -3,7 +3,7 @@ import deps from "../json/deps.json" with { type: "json" };
 import { PACKAGE_VERSION, readTemplate } from "../lib.ts";
 import type { PackageManager, WebFrameworkDescription } from "../types.ts";
 import { defaultDenoDependencies, defaultDevDependencies } from "./const.ts";
-import { getInstruction, pmToRt } from "./utils.ts";
+import { getInstruction, nodeBunDevToolTasks, pmToRt } from "./utils.ts";
 
 const astroDescription: WebFrameworkDescription = {
   label: "Astro",
@@ -48,9 +48,6 @@ const astroDescription: WebFrameworkDescription = {
           `astro/astro.config.${pmToRt(pm)}.ts`,
         ),
         "src/middleware.ts": await readTemplate("astro/src/middleware.ts"),
-        ...(pm !== "deno" && {
-          "eslint.config.ts": await readTemplate("defaults/eslint.config.ts"),
-        }),
       },
       tasks: TASKS[pmToRt(pm)],
       instruction: getInstruction(pm, 4321),
@@ -96,12 +93,12 @@ const TASKS = {
     dev: "bunx --bun astro dev",
     build: "bunx --bun astro build",
     preview: "bun ./dist/server/entry.mjs",
-    lint: "eslint .",
+    ...nodeBunDevToolTasks,
   },
   "node": {
     dev: "dotenvx run -- astro dev",
     build: "dotenvx run -- astro build",
     preview: "dotenvx run -- astro preview",
-    lint: "eslint .",
+    ...nodeBunDevToolTasks,
   },
 };
diff --git a/packages/init/src/webframeworks/bare-bones.ts b/packages/init/src/webframeworks/bare-bones.ts
index 03cc2409b..894440ffb 100644
--- a/packages/init/src/webframeworks/bare-bones.ts
+++ b/packages/init/src/webframeworks/bare-bones.ts
@@ -3,7 +3,7 @@ import deps from "../json/deps.json" with { type: "json" };
 import { readTemplate } from "../lib.ts";
 import type { WebFrameworkDescription } from "../types.ts";
 import { defaultDenoDependencies, defaultDevDependencies } from "./const.ts";
-import { getInstruction, pmToRt } from "./utils.ts";
+import { getInstruction, nodeBunDevToolTasks, pmToRt } from "./utils.ts";
 
 const bareBonesDescription: WebFrameworkDescription = {
   label: "Bare-bones",
@@ -21,9 +21,6 @@ const bareBonesDescription: WebFrameworkDescription = {
     loggingFile: "src/logging.ts",
     files: {
       "src/main.ts": await readTemplate(`bare-bones/main/${pmToRt(pm)}.ts`),
-      ...(pm !== "deno" && {
-        "eslint.config.ts": await readTemplate("defaults/eslint.config.ts"),
-      }),
     },
     compilerOptions: (pm === "deno"
       ? {
@@ -70,11 +67,11 @@ const TASKS = {
   bun: {
     dev: "bun run --hot ./src/main.ts",
     prod: "bun run ./src/main.ts",
-    lint: "eslint .",
+    ...nodeBunDevToolTasks,
   },
   node: {
     dev: "dotenvx run -- tsx watch ./src/main.ts",
     prod: "dotenvx run -- node --import tsx ./src/main.ts",
-    lint: "eslint .",
+    ...nodeBunDevToolTasks,
   },
 };
diff --git a/packages/init/src/webframeworks/const.ts b/packages/init/src/webframeworks/const.ts
index df3fb7b52..f0b658c65 100644
--- a/packages/init/src/webframeworks/const.ts
+++ b/packages/init/src/webframeworks/const.ts
@@ -3,8 +3,8 @@ import { PACKAGE_VERSION } from "../lib.ts";
 
 export const defaultDevDependencies = {
   "@fedify/lint": PACKAGE_VERSION,
-  "eslint": deps["npm:eslint"],
-  "@biomejs/biome": deps["npm:@biomejs/biome"],
+  "oxfmt": deps["npm:oxfmt"],
+  "oxlint": deps["npm:oxlint"],
 };
 
 export const defaultDenoDependencies = {
diff --git a/packages/init/src/webframeworks/elysia.ts b/packages/init/src/webframeworks/elysia.ts
index 6c4e4b408..4334995a8 100644
--- a/packages/init/src/webframeworks/elysia.ts
+++ b/packages/init/src/webframeworks/elysia.ts
@@ -3,7 +3,7 @@ import deps from "../json/deps.json" with { type: "json" };
 import { PACKAGE_VERSION, readTemplate } from "../lib.ts";
 import type { WebFrameworkDescription } from "../types.ts";
 import { defaultDenoDependencies, defaultDevDependencies } from "./const.ts";
-import { getInstruction, pmToRt } from "./utils.ts";
+import { getInstruction, nodeBunDevToolTasks, pmToRt } from "./utils.ts";
 
 const elysiaDescription: WebFrameworkDescription = {
   label: "ElysiaJS",
@@ -45,9 +45,6 @@ const elysiaDescription: WebFrameworkDescription = {
       "src/index.ts": (await readTemplate(
         `elysia/index/${pmToRt(pm)}.ts`,
       )).replace(/\/\* logger \*\//, projectName),
-      ...(pm !== "deno" && {
-        "eslint.config.ts": await readTemplate("defaults/eslint.config.ts"),
-      }),
     },
     compilerOptions: pm === "deno" || pm === "bun" ? undefined : {
       "lib": ["ESNext", "DOM"],
@@ -75,13 +72,13 @@ const TASKS = {
   bun: {
     dev: "bun run --hot ./src/index.ts",
     prod: "bun run ./src/index.ts",
-    lint: "eslint .",
+    ...nodeBunDevToolTasks,
   },
   node: {
     dev: "dotenvx run -- tsx watch src/index.ts",
     build: "tsc src/index.ts --outDir dist",
     start: "NODE_ENV=production dotenvx run -- node dist/index.js",
-    lint: "eslint .",
+    ...nodeBunDevToolTasks,
   },
 };
 
diff --git a/packages/init/src/webframeworks/express.ts b/packages/init/src/webframeworks/express.ts
index 101c03a8b..9a09c1a57 100644
--- a/packages/init/src/webframeworks/express.ts
+++ b/packages/init/src/webframeworks/express.ts
@@ -3,7 +3,7 @@ import deps from "../json/deps.json" with { type: "json" };
 import { PACKAGE_VERSION, readTemplate } from "../lib.ts";
 import type { WebFrameworkDescription } from "../types.ts";
 import { defaultDenoDependencies, defaultDevDependencies } from "./const.ts";
-import { getInstruction, pmToRt } from "./utils.ts";
+import { getInstruction, nodeBunDevToolTasks, pmToRt } from "./utils.ts";
 
 const expressDescription: WebFrameworkDescription = {
   label: "Express",
@@ -30,11 +30,6 @@ const expressDescription: WebFrameworkDescription = {
       "src/app.ts": (await readTemplate("express/app.ts"))
         .replace(/\/\* logger \*\//, projectName),
       "src/index.ts": await readTemplate("express/index.ts"),
-      ...(pm !== "deno"
-        ? {
-          "eslint.config.ts": await readTemplate("defaults/eslint.config.ts"),
-        }
-        : {}),
     },
     compilerOptions: pm === "deno" ? undefined : {
       "lib": ["ESNext", "DOM"],
@@ -63,11 +58,11 @@ const TASKS = {
   bun: {
     dev: "bun run --hot ./src/index.ts",
     prod: "bun run ./src/index.ts",
-    lint: "eslint .",
+    ...nodeBunDevToolTasks,
   },
   node: {
     dev: "dotenvx run -- tsx watch ./src/index.ts",
     prod: "dotenvx run -- node --import tsx ./src/index.ts",
-    lint: "eslint .",
+    ...nodeBunDevToolTasks,
   },
 };
diff --git a/packages/init/src/webframeworks/hono.ts b/packages/init/src/webframeworks/hono.ts
index a9b867a27..f10ffff2c 100644
--- a/packages/init/src/webframeworks/hono.ts
+++ b/packages/init/src/webframeworks/hono.ts
@@ -5,7 +5,7 @@ import { PACKAGE_VERSION, readTemplate } from "../lib.ts";
 import type { WebFrameworkDescription } from "../types.ts";
 import { replace } from "../utils.ts";
 import { defaultDenoDependencies, defaultDevDependencies } from "./const.ts";
-import { getInstruction, pmToRt } from "./utils.ts";
+import { getInstruction, nodeBunDevToolTasks, pmToRt } from "./utils.ts";
 
 const honoDescription: WebFrameworkDescription = {
   label: "Hono",
@@ -28,11 +28,6 @@ const honoDescription: WebFrameworkDescription = {
       "src/index.ts": await readTemplate(
         `hono/index/${pmToRt(pm)}.ts`,
       ),
-      ...(pm !== "deno"
-        ? {
-          "eslint.config.ts": await readTemplate("defaults/eslint.config.ts"),
-        }
-        : {}),
     },
     compilerOptions: pm === "deno" ? undefined : {
       "lib": ["ESNext", "DOM"],
@@ -84,11 +79,11 @@ const TASKS = {
   bun: {
     dev: "bun run --hot ./src/index.ts",
     prod: "bun run ./src/index.ts",
-    lint: "eslint .",
+    ...nodeBunDevToolTasks,
   },
   node: {
     dev: "dotenvx run -- tsx watch ./src/index.ts",
     prod: "dotenvx run -- node --import tsx ./src/index.ts",
-    lint: "eslint .",
+    ...nodeBunDevToolTasks,
   },
 };
diff --git a/packages/init/src/webframeworks/next.ts b/packages/init/src/webframeworks/next.ts
index c4b3935bc..3870f4dcd 100644
--- a/packages/init/src/webframeworks/next.ts
+++ b/packages/init/src/webframeworks/next.ts
@@ -3,7 +3,7 @@ import deps from "../json/deps.json" with { type: "json" };
 import { PACKAGE_VERSION, readTemplate } from "../lib.ts";
 import type { PackageManager, WebFrameworkDescription } from "../types.ts";
 import { defaultDenoDependencies, defaultDevDependencies } from "./const.ts";
-import { getInstruction } from "./utils.ts";
+import { getInstruction, getNodeBunDevToolTasks } from "./utils.ts";
 
 const nextDescription: WebFrameworkDescription = {
   label: "Next.js",
@@ -11,6 +11,11 @@ const nextDescription: WebFrameworkDescription = {
   defaultPort: 3000,
   init: async ({ packageManager: pm, skipInstall }) => ({
     command: getNextInitCommand(pm, skipInstall),
+    cleanupFiles: pm === "deno" ? [] : ["eslint.config.mjs"],
+    cleanupPackageJson: pm === "deno" ? {} : {
+      scripts: ["lint"],
+      devDependencies: ["eslint", "eslint-config-next"],
+    },
     dependencies: {
       "@fedify/next": PACKAGE_VERSION,
       ...(pm === "deno" ? defaultDenoDependencies : {}),
@@ -24,13 +29,8 @@ const nextDescription: WebFrameworkDescription = {
     files: {
       "instrumentation.ts": await readTemplate("next/instrumentation.ts"),
       "middleware.ts": await readTemplate("next/middleware.ts"),
-      ...(pm !== "deno" && {
-        "eslint.config.ts": await readTemplate("defaults/eslint.config.ts"),
-      }),
     },
-    tasks: pm !== "deno"
-      ? { "lint": "eslint ." }
-      : {} as Record<string, string>,
+    tasks: getNodeBunDevToolTasks(pm),
     instruction: getInstruction(pm, 3000),
   }),
 };
diff --git a/packages/init/src/webframeworks/nitro.ts b/packages/init/src/webframeworks/nitro.ts
index 996549426..06fd66118 100644
--- a/packages/init/src/webframeworks/nitro.ts
+++ b/packages/init/src/webframeworks/nitro.ts
@@ -2,7 +2,7 @@ import { PACKAGE_MANAGER } from "../const.ts";
 import { PACKAGE_VERSION, readTemplate } from "../lib.ts";
 import type { PackageManager, WebFrameworkDescription } from "../types.ts";
 import { defaultDenoDependencies, defaultDevDependencies } from "./const.ts";
-import { getInstruction } from "./utils.ts";
+import { getInstruction, getNodeBunDevToolTasks } from "./utils.ts";
 
 const nitroDescription: WebFrameworkDescription = {
   label: "Nitro",
@@ -10,6 +10,9 @@ const nitroDescription: WebFrameworkDescription = {
   defaultPort: 3000,
   init: async ({ packageManager: pm, testMode }) => ({
     command: getNitroInitCommand(pm),
+    cleanupFiles: pm === "deno"
+      ? []
+      : ["server/routes/index.ts", "tsconfig.json"],
     dependencies: {
       "@fedify/h3": PACKAGE_VERSION,
       ...(pm === "deno" && defaultDenoDependencies),
@@ -27,13 +30,33 @@ const nitroDescription: WebFrameworkDescription = {
       ),
       "server/error.ts": await readTemplate("nitro/server/error.ts"),
       "nitro.config.ts": await readTemplate("nitro/nitro.config.ts"),
-      ...(pm !== "deno" && {
-        "eslint.config.ts": await readTemplate("defaults/eslint.config.ts"),
+      ...(pm === "deno" ? {} : {
+        "server/routes/index.ts": await readTemplate(
+          "nitro/server/routes/index.ts",
+        ),
       }),
     },
-    tasks: pm !== "deno"
-      ? { "lint": "eslint ." }
-      : {} as Record<string, string>,
+    compilerOptions: pm === "deno" ? undefined : {
+      target: "ESNext",
+      module: "ESNext",
+      moduleResolution: "Bundler",
+      jsx: "preserve",
+      jsxFactory: "h",
+      jsxFragmentFactory: "Fragment",
+      strict: true,
+      noEmit: true,
+      skipLibCheck: true,
+      resolveJsonModule: true,
+      allowSyntheticDefaultImports: true,
+      forceConsistentCasingInFileNames: true,
+      noImplicitReturns: true,
+      noFallthroughCasesInSwitch: true,
+      useUnknownInCatchVariables: true,
+      noUnusedLocals: true,
+      lib: ["ESNext", "DOM"],
+      baseUrl: ".",
+    },
+    tasks: getNodeBunDevToolTasks(pm),
     instruction: getInstruction(pm, 3000),
   }),
 };
diff --git a/packages/init/src/webframeworks/nuxt.ts b/packages/init/src/webframeworks/nuxt.ts
index 083e6d672..babe49de0 100644
--- a/packages/init/src/webframeworks/nuxt.ts
+++ b/packages/init/src/webframeworks/nuxt.ts
@@ -3,7 +3,7 @@ import deps from "../json/deps.json" with { type: "json" };
 import { PACKAGE_VERSION, readTemplate } from "../lib.ts";
 import type { PackageManager, WebFrameworkDescription } from "../types.ts";
 import { defaultDenoDependencies, defaultDevDependencies } from "./const.ts";
-import { getInstruction } from "./utils.ts";
+import { getInstruction, getNodeBunDevToolTasks } from "./utils.ts";
 
 const nuxtDescription: WebFrameworkDescription = {
   label: "Nuxt",
@@ -26,13 +26,8 @@ const nuxtDescription: WebFrameworkDescription = {
       "server/plugins/logging.ts": await readTemplate(
         "nuxt/server/plugins/logging.ts",
       ),
-      ...(pm !== "deno" && {
-        "eslint.config.ts": await readTemplate("defaults/eslint.config.ts"),
-      }),
     },
-    tasks: pm !== "deno"
-      ? { "lint": "eslint ." }
-      : {} as Record<string, string>,
+    tasks: getNodeBunDevToolTasks(pm),
     instruction: getInstruction(pm, 3000),
   }),
 };
diff --git a/packages/init/src/webframeworks/solidstart.ts b/packages/init/src/webframeworks/solidstart.ts
index dee370003..35e33dc57 100644
--- a/packages/init/src/webframeworks/solidstart.ts
+++ b/packages/init/src/webframeworks/solidstart.ts
@@ -3,7 +3,7 @@ import deps from "../json/deps.json" with { type: "json" };
 import { PACKAGE_VERSION, readTemplate } from "../lib.ts";
 import type { WebFrameworkDescription } from "../types.ts";
 import { defaultDenoDependencies, defaultDevDependencies } from "./const.ts";
-import { getInstruction, pmToRt } from "./utils.ts";
+import { getInstruction, nodeBunDevToolTasks, pmToRt } from "./utils.ts";
 
 const NPM_SOLIDSTART = `npm:@solidjs/start@${deps["npm:@solidjs/start"]}`;
 const solidstartDescription: WebFrameworkDescription = {
@@ -38,9 +38,6 @@ const solidstartDescription: WebFrameworkDescription = {
       "src/middleware/index.ts": await readTemplate(
         "solidstart/src/middleware/index.ts",
       ),
-      ...(pm !== "deno" && {
-        "eslint.config.ts": await readTemplate("defaults/eslint.config.ts"),
-      }),
     },
     compilerOptions: pm === "deno" ? undefined : {
       target: "ESNext",
@@ -99,12 +96,12 @@ const TASKS = {
     dev: "bunx vinxi dev",
     build: "bunx vinxi build",
     start: "bunx vinxi start",
-    lint: "eslint .",
+    ...nodeBunDevToolTasks,
   },
   node: {
     dev: "vinxi dev",
     build: "vinxi build",
     start: "dotenvx run -- vinxi start",
-    lint: "eslint .",
+    ...nodeBunDevToolTasks,
   },
 };
diff --git a/packages/init/src/webframeworks/utils.ts b/packages/init/src/webframeworks/utils.ts
index 12a9a1229..1448a81e0 100644
--- a/packages/init/src/webframeworks/utils.ts
+++ b/packages/init/src/webframeworks/utils.ts
@@ -3,6 +3,16 @@ import { commandLine, message } from "@optique/core/message";
 import { getDevCommand } from "../lib.ts";
 import type { PackageManager } from "../types.ts";
 
+export const nodeBunDevToolTasks = {
+  format: "oxfmt",
+  "format:check": "oxfmt --check",
+  lint: "oxlint .",
+} as const satisfies Record<string, string>;
+
+export const getNodeBunDevToolTasks = (
+  pm: PackageManager,
+): Record<string, string> => pm === "deno" ? {} : nodeBunDevToolTasks;
+
 /**
  * Generates the post-initialization instruction message that shows
  * the user how to start the dev server and look up an actor.

From ae2477f1d06814077451ea40295cbd192a82abc5 Mon Sep 17 00:00:00 2001
From: Hong Minhee <hong@minhee.org>
Date: Wed, 24 Jun 2026 02:00:13 +0900
Subject: [PATCH 02/13] Polish generated Oxc scaffolds

Generated federation files now exercise the logger they create, and the Hono
and Express app templates no longer create unused logger constants.  This keeps
generated Oxc projects warning-free while still showing LogTape through the
federation setup.

The JSON formatter now rejects values deeper than 100 levels before recursively
walking them.  The generated Oxlint config also ignores Markdown files to match
Oxfmt, and tests cover the Markdown ignore plus both ESLint config file
variants.

https://github.com/fedify-dev/fedify/pull/818#discussion_r3461410704
https://github.com/fedify-dev/fedify/pull/818#discussion_r3461410707
https://github.com/fedify-dev/fedify/pull/818#discussion_r3461483753
https://github.com/fedify-dev/fedify/pull/818#discussion_r3461483759

Assisted-by: Codex:gpt-5.5
---
 packages/init/src/action/configs.test.ts            |  1 +
 packages/init/src/json/oxlint.json                  |  1 +
 .../src/templates/defaults/federation.oxc.ts.tpl    |  1 +
 .../init/src/templates/defaults/federation.ts.tpl   |  1 +
 packages/init/src/templates/express/app.ts.tpl      |  3 ---
 packages/init/src/templates/hono/app.tsx.tpl        |  3 ---
 packages/init/src/utils.test.ts                     | 13 +++++++++++++
 packages/init/src/utils.ts                          |  5 +++++
 packages/init/src/webframeworks.test.ts             |  1 +
 9 files changed, 23 insertions(+), 6 deletions(-)
 create mode 100644 packages/init/src/utils.test.ts

diff --git a/packages/init/src/action/configs.test.ts b/packages/init/src/action/configs.test.ts
index 0318446e2..8b0fc30ca 100644
--- a/packages/init/src/action/configs.test.ts
+++ b/packages/init/src/action/configs.test.ts
@@ -161,6 +161,7 @@ test("patchFiles creates Oxfmt and Oxlint configs for npm projects", async () =>
     assert.ok(oxfmtConfig.ignorePatterns?.includes("node_modules/**"));
     assert.ok(oxfmtConfig.ignorePatterns?.includes("**/*.md"));
     assert.ok(oxlintConfig.ignorePatterns?.includes("node_modules/**"));
+    assert.ok(oxlintConfig.ignorePatterns?.includes("**/*.md"));
     assert.deepEqual(oxlintConfig.jsPlugins, ["@fedify/lint/oxlint"]);
     assert.equal(
       oxlintConfig.rules?.["@fedify/lint/actor-id-required"],
diff --git a/packages/init/src/json/oxlint.json b/packages/init/src/json/oxlint.json
index 8aafbd594..fea575bfe 100644
--- a/packages/init/src/json/oxlint.json
+++ b/packages/init/src/json/oxlint.json
@@ -8,6 +8,7 @@
     "build/**",
     "coverage/**",
     "dist/**",
+    "**/*.md",
     "node_modules/**"
   ],
   "jsPlugins": [
diff --git a/packages/init/src/templates/defaults/federation.oxc.ts.tpl b/packages/init/src/templates/defaults/federation.oxc.ts.tpl
index b9441f1b8..c299a7df8 100644
--- a/packages/init/src/templates/defaults/federation.oxc.ts.tpl
+++ b/packages/init/src/templates/defaults/federation.oxc.ts.tpl
@@ -11,6 +11,7 @@ const federation = createFederation({
 });
 
 federation.setActorDispatcher("/users/{identifier}", async (ctx, identifier) => {
+  logger.info("Dispatching actor {identifier}", { identifier });
   return new Person({
     id: ctx.getActorUri(identifier),
     preferredUsername: identifier,
diff --git a/packages/init/src/templates/defaults/federation.ts.tpl b/packages/init/src/templates/defaults/federation.ts.tpl
index 6d3b0dfdb..c2c7d5611 100644
--- a/packages/init/src/templates/defaults/federation.ts.tpl
+++ b/packages/init/src/templates/defaults/federation.ts.tpl
@@ -13,6 +13,7 @@ const federation = createFederation({
 federation.setActorDispatcher(
   "/users/{identifier}",
   async (ctx, identifier) => {
+    logger.info("Dispatching actor {identifier}", { identifier });
     return new Person({
       id: ctx.getActorUri(identifier),
       preferredUsername: identifier,
diff --git a/packages/init/src/templates/express/app.ts.tpl b/packages/init/src/templates/express/app.ts.tpl
index a968c5131..50ad695e4 100644
--- a/packages/init/src/templates/express/app.ts.tpl
+++ b/packages/init/src/templates/express/app.ts.tpl
@@ -1,10 +1,7 @@
 import { integrateFederation } from "@fedify/express";
-import { getLogger } from "@logtape/logtape";
 import express from "express";
 import federation from "./federation.ts";
 
-const logger = getLogger("/* logger */");
-
 export const app = express();
 
 app.set("trust proxy", true);
diff --git a/packages/init/src/templates/hono/app.tsx.tpl b/packages/init/src/templates/hono/app.tsx.tpl
index 34f826c26..d661eaf25 100644
--- a/packages/init/src/templates/hono/app.tsx.tpl
+++ b/packages/init/src/templates/hono/app.tsx.tpl
@@ -1,11 +1,8 @@
 // @ts-nocheck this file is just a template
 import { Hono } from "/* hono */";
 import { federation } from "@fedify/hono";
-import { getLogger } from "@logtape/logtape";
 import fedi from "./federation.ts";
 
-const logger = getLogger("/* logger */");
-
 const app = new Hono();
 app.use(federation(fedi, () => undefined));
 
diff --git a/packages/init/src/utils.test.ts b/packages/init/src/utils.test.ts
new file mode 100644
index 000000000..bf1aaea83
--- /dev/null
+++ b/packages/init/src/utils.test.ts
@@ -0,0 +1,13 @@
+import assert from "node:assert/strict";
+import test from "node:test";
+import { formatJson } from "./utils.ts";
+
+test("formatJson rejects deeply nested values", () => {
+  let value: unknown = "leaf";
+  for (let i = 0; i < 101; i++) value = { value };
+
+  assert.throws(
+    () => formatJson(value),
+    new RangeError("Maximum depth exceeded while formatting JSON."),
+  );
+});
diff --git a/packages/init/src/utils.ts b/packages/init/src/utils.ts
index ee75e5a7f..0182a1b3a 100644
--- a/packages/init/src/utils.ts
+++ b/packages/init/src/utils.ts
@@ -87,7 +87,12 @@ export const replaceAll = (
 /** Serializes a value to a pretty-printed JSON string with a trailing newline. */
 export const formatJson = (obj: unknown) => formatJsonValue(obj, 0) + "\n";
 
+const MAX_JSON_FORMAT_DEPTH = 100;
+
 function formatJsonValue(value: unknown, depth: number): string {
+  if (depth > MAX_JSON_FORMAT_DEPTH) {
+    throw new RangeError("Maximum depth exceeded while formatting JSON.");
+  }
   if (Array.isArray(value)) return formatJsonArray(value, depth);
   if (value !== null && typeof value === "object") {
     return formatJsonObject(value as Record<string, unknown>, depth);
diff --git a/packages/init/src/webframeworks.test.ts b/packages/init/src/webframeworks.test.ts
index fc49566fb..9d2810adc 100644
--- a/packages/init/src/webframeworks.test.ts
+++ b/packages/init/src/webframeworks.test.ts
@@ -116,6 +116,7 @@ test("Node.js and Bun templates use Oxfmt and Oxlint", async () => {
       equal(initializer.tasks?.["format:check"], "oxfmt --check");
       equal(initializer.tasks?.lint, "oxlint .");
       equal(initializer.files?.["eslint.config.ts"], undefined);
+      equal(initializer.files?.["eslint.config.mjs"], undefined);
       equal(initializer.devDependencies?.["@fedify/lint"] != null, true);
       equal(initializer.devDependencies?.["oxfmt"] != null, true);
       equal(initializer.devDependencies?.["oxlint"] != null, true);

From aa51a3809307f30849d9d47ed6b08feeca37a17b Mon Sep 17 00:00:00 2001
From: Hong Minhee <hong@minhee.org>
Date: Wed, 24 Jun 2026 02:19:56 +0900
Subject: [PATCH 03/13] Handle Oxc review follow-ups

The JSON formatter now respects values that serialize themselves with toJSON,
including Date-like values, while keeping the recursive depth guard separate
from formatting indentation.  Tests cover both the deep-value guard and the
custom serializer path.

The Threadiverse tutorial now matches the generated federation scaffold, which
keeps its LogTape logger and uses it in the actor dispatcher instead of asking
readers to delete it.

https://github.com/fedify-dev/fedify/pull/818#discussion_r3461536466
https://github.com/fedify-dev/fedify/pull/818#discussion_r3461597178

Assisted-by: Codex:gpt-5.5
---
 docs/tutorial/threadiverse.md   | 36 ++++-----------------------------
 packages/init/src/utils.test.ts | 12 +++++++++++
 packages/init/src/utils.ts      | 18 ++++++++++++++++-
 3 files changed, 33 insertions(+), 33 deletions(-)

diff --git a/docs/tutorial/threadiverse.md b/docs/tutorial/threadiverse.md
index 32575cae9..012480974 100644
--- a/docs/tutorial/threadiverse.md
+++ b/docs/tutorial/threadiverse.md
@@ -275,38 +275,10 @@ npm run format:check
 npm run lint
 ~~~~
 
-Oxlint may warn that *federation/index.ts* imports `getLogger` from LogTape
-and assigns the result to a `logger` constant, but nothing reads that
-`logger` yet.  Delete the unused import and declaration:
-
-~~~~ typescript [federation/index.ts]
-import {
-  createFederation,
-  InProcessMessageQueue,
-  MemoryKvStore,
-} from "@fedify/fedify";
-import { Person } from "@fedify/vocab";
-
-const federation = createFederation({
-  kv: new MemoryKvStore(),
-  queue: new InProcessMessageQueue(),
-});
-
-federation.setActorDispatcher(
-  "/users/{identifier}",
-  async (ctx, identifier) => {
-    return new Person({
-      id: ctx.getActorUri(identifier),
-      preferredUsername: identifier,
-      name: identifier,
-    });
-  },
-);
-
-export default federation;
-~~~~
-
-We'll add logging back later when there's something worth logging.
+Both commands should pass on the generated files.  The generated
+*federation/index.ts* keeps its LogTape logger and uses it in the actor
+dispatcher, which gives the file a small logging example before we add more
+domain-specific logs later.
 
 [Oxfmt]: https://oxc.rs/docs/guide/usage/formatter/
 [Oxlint]: https://oxc.rs/docs/guide/usage/linter/
diff --git a/packages/init/src/utils.test.ts b/packages/init/src/utils.test.ts
index bf1aaea83..c0f246ee4 100644
--- a/packages/init/src/utils.test.ts
+++ b/packages/init/src/utils.test.ts
@@ -11,3 +11,15 @@ test("formatJson rejects deeply nested values", () => {
     new RangeError("Maximum depth exceeded while formatting JSON."),
   );
 });
+
+test("formatJson serializes values with toJSON methods", () => {
+  assert.equal(
+    formatJson({
+      stamp: new Date("2026-06-24T00:00:00.000Z"),
+      custom: {
+        toJSON: () => ({ value: "serialized" }),
+      },
+    }),
+    '{\n  "stamp": "2026-06-24T00:00:00.000Z",\n  "custom": {\n    "value": "serialized"\n  }\n}\n',
+  );
+});
diff --git a/packages/init/src/utils.ts b/packages/init/src/utils.ts
index 0182a1b3a..4dc530f5e 100644
--- a/packages/init/src/utils.ts
+++ b/packages/init/src/utils.ts
@@ -89,10 +89,20 @@ export const formatJson = (obj: unknown) => formatJsonValue(obj, 0) + "\n";
 
 const MAX_JSON_FORMAT_DEPTH = 100;
 
-function formatJsonValue(value: unknown, depth: number): string {
+function formatJsonValue(
+  value: unknown,
+  depth: number,
+  toJSONDepth = 0,
+): string {
   if (depth > MAX_JSON_FORMAT_DEPTH) {
     throw new RangeError("Maximum depth exceeded while formatting JSON.");
   }
+  if (toJSONDepth > MAX_JSON_FORMAT_DEPTH) {
+    throw new RangeError("Maximum depth exceeded while formatting JSON.");
+  }
+  if (hasToJSON(value)) {
+    return formatJsonValue(value.toJSON(), depth, toJSONDepth + 1);
+  }
   if (Array.isArray(value)) return formatJsonArray(value, depth);
   if (value !== null && typeof value === "object") {
     return formatJsonObject(value as Record<string, unknown>, depth);
@@ -100,6 +110,12 @@ function formatJsonValue(value: unknown, depth: number): string {
   return formatJsonPrimitive(value);
 }
 
+function hasToJSON(value: unknown): value is { toJSON: () => unknown } {
+  return value !== null &&
+    typeof value === "object" &&
+    typeof (value as { toJSON?: unknown }).toJSON === "function";
+}
+
 function formatJsonArray(values: unknown[], depth: number): string {
   if (values.length === 0) return "[]";
   const canCompact = values.every((value) =>

From 16d7f9cd407d89befe279156f2085732be05c715 Mon Sep 17 00:00:00 2001
From: Hong Minhee <hong@minhee.org>
Date: Wed, 24 Jun 2026 05:04:28 +0900
Subject: [PATCH 04/13] Preserve Nitro tsconfig metadata

Nitro scaffolds can create a tsconfig.json that carries framework metadata such
as an extends entry.  The cleanup step now keeps that file so patchFiles can
merge Fedify's compiler options into it instead of replacing the framework
configuration.

JSON merging now accepts the JSONC shape used by Nitro's template, including
comments and trailing commas.  A regression test covers preserving Nitro's
extends value while adding Fedify's compiler options.

https://github.com/fedify-dev/fedify/pull/818#discussion_r3461652229

Assisted-by: Codex:gpt-5.5
---
 packages/init/src/action/configs.test.ts | 70 ++++++++++++++++++++++++
 packages/init/src/action/patch.ts        | 15 ++---
 packages/init/src/webframeworks/nitro.ts |  4 +-
 3 files changed, 79 insertions(+), 10 deletions(-)

diff --git a/packages/init/src/action/configs.test.ts b/packages/init/src/action/configs.test.ts
index 8b0fc30ca..af2607047 100644
--- a/packages/init/src/action/configs.test.ts
+++ b/packages/init/src/action/configs.test.ts
@@ -10,6 +10,7 @@ import { kvStores, messageQueues } from "../lib.ts";
 import type { InitCommandData } from "../types.ts";
 import bareBonesDescription from "../webframeworks/bare-bones.ts";
 import nextDescription from "../webframeworks/next.ts";
+import nitroDescription from "../webframeworks/nitro.ts";
 import nuxtDescription from "../webframeworks/nuxt.ts";
 import { cleanupScaffoldedFiles } from "./cleanup.ts";
 import { loadDenoConfig } from "./configs.ts";
@@ -245,6 +246,40 @@ test("cleanupScaffoldedFiles removes Next.js ESLint artifacts", async () => {
   }
 });
 
+test("patchFiles preserves Nitro's generated tsconfig extends", async () => {
+  const dir = await mkdtemp(join(tmpdir(), "fedify-init-nitro-tsconfig-"));
+
+  try {
+    const data = await createNitroNpmInitData(dir);
+    await writeFile(
+      join(dir, "tsconfig.json"),
+      `{
+  // https://nitro.build/guide/typescript
+  "extends": "./.nitro/types/tsconfig.json",
+  "compilerOptions": {
+    "types": ["node"],
+  },
+}
+`,
+    );
+
+    await cleanupScaffoldedFiles(data);
+    await patchFiles(data);
+
+    const tsconfig = JSON.parse(
+      await readFile(join(dir, "tsconfig.json"), "utf8"),
+    ) as {
+      extends?: string;
+      compilerOptions?: Record<string, unknown>;
+    };
+    assert.equal(tsconfig.extends, "./.nitro/types/tsconfig.json");
+    assert.deepEqual(tsconfig.compilerOptions?.types, ["node"]);
+    assert.equal(tsconfig.compilerOptions?.moduleResolution, "Bundler");
+  } finally {
+    await rm(dir, { recursive: true, force: true });
+  }
+});
+
 test("patchFiles wires Nuxt logging through a Nitro plugin", async () => {
   const dir = await mkdtemp(join(tmpdir(), "fedify-init-nuxt-"));
 
@@ -372,6 +407,41 @@ async function createNextNpmInitData(dir: string): Promise<InitCommandData> {
   return data;
 }
 
+async function createNitroNpmInitData(dir: string): Promise<InitCommandData> {
+  const initializer = await nitroDescription.init({
+    command: "init",
+    projectName: "example",
+    packageManager: "npm",
+    webFramework: "nitro",
+    kvStore: "in-memory",
+    messageQueue: "in-process",
+    dryRun: false,
+    allowNonEmpty: false,
+    skipInstall: false,
+    testMode: false,
+    dir,
+  });
+
+  const data = {
+    command: "init",
+    projectName: "example",
+    packageManager: "npm",
+    webFramework: "nitro",
+    kvStore: "in-memory",
+    messageQueue: "in-process",
+    dryRun: false,
+    allowNonEmpty: false,
+    skipInstall: false,
+    testMode: false,
+    dir,
+    initializer,
+    kv: kvStores["in-memory"],
+    mq: messageQueues["in-process"],
+    env: {},
+  } satisfies InitCommandData;
+  return data;
+}
+
 async function createNuxtNpmInitData(dir: string): Promise<InitCommandData> {
   const initializer = await nuxtDescription.init({
     command: "init",
diff --git a/packages/init/src/action/patch.ts b/packages/init/src/action/patch.ts
index 09b1f4dd3..803fe9808 100644
--- a/packages/init/src/action/patch.ts
+++ b/packages/init/src/action/patch.ts
@@ -295,7 +295,7 @@ async function patchContent(
  * Merges new JSON data with existing JSON content and formats the result.
  * Parses existing JSON content (if any) and deep merges it with new data,
  * then formats the result for consistent output.
- * Supports JSONC (JSON with Comments) by removing comments before parsing.
+ * Supports JSONC by removing comments and trailing commas before parsing.
  *
  * @param prev - The previous JSON content as string
  * @param data - The new data object to merge
@@ -303,23 +303,24 @@ async function patchContent(
  */
 const mergeJson = (prev: string, data: object): string =>
   pipe(
-    prev ? JSON.parse(removeJsonComments(prev)) : {},
+    prev ? JSON.parse(removeJsoncSyntax(prev)) : {},
     merge(data),
     formatJson,
   );
 
 /**
- * Removes single-line (//) and multi-line (/* *\/) comments from JSON string.
- * This allows parsing JSONC (JSON with Comments) files.
+ * Removes single-line (//) comments, multi-line (/* *\/) comments, and
+ * trailing commas from a JSONC string.
  *
- * @param jsonString - The JSON string potentially containing comments
- * @returns JSON string with comments removed
+ * @param jsonString - The JSON string potentially containing JSONC syntax
+ * @returns JSON string with JSONC-only syntax removed
  */
-const removeJsonComments = (jsonString: string): string =>
+const removeJsoncSyntax = (jsonString: string): string =>
   pipe(
     jsonString,
     replaceAll(/\/\/.*$/gm, ""),
     replaceAll(/\/\*[\s\S]*?\*\//g, ""),
+    replaceAll(/,(\s*[}\]])/g, "$1"),
   );
 
 /**
diff --git a/packages/init/src/webframeworks/nitro.ts b/packages/init/src/webframeworks/nitro.ts
index 06fd66118..d3a263d79 100644
--- a/packages/init/src/webframeworks/nitro.ts
+++ b/packages/init/src/webframeworks/nitro.ts
@@ -10,9 +10,7 @@ const nitroDescription: WebFrameworkDescription = {
   defaultPort: 3000,
   init: async ({ packageManager: pm, testMode }) => ({
     command: getNitroInitCommand(pm),
-    cleanupFiles: pm === "deno"
-      ? []
-      : ["server/routes/index.ts", "tsconfig.json"],
+    cleanupFiles: pm === "deno" ? [] : ["server/routes/index.ts"],
     dependencies: {
       "@fedify/h3": PACKAGE_VERSION,
       ...(pm === "deno" && defaultDenoDependencies),

From 0e496e09d4c7a1f84bdc9f1000a3f492374058e2 Mon Sep 17 00:00:00 2001
From: Hong Minhee <hong@minhee.org>
Date: Wed, 24 Jun 2026 05:30:41 +0900
Subject: [PATCH 05/13] Parse JSONC without touching strings

Generated Nitro tsconfig files can include URL strings and other values that
look like JSONC comments.  The JSONC cleanup now scans the text and removes
comments and trailing commas only outside string literals, so patching keeps
existing string values intact.

https://github.com/fedify-dev/fedify/pull/818#discussion_r3462619822
https://github.com/fedify-dev/fedify/pull/818#discussion_r3462642442

Assisted-by: Codex:gpt-5.5
---
 packages/init/src/action/configs.test.ts | 17 +++++
 packages/init/src/action/patch.ts        | 81 +++++++++++++++++++++---
 2 files changed, 90 insertions(+), 8 deletions(-)

diff --git a/packages/init/src/action/configs.test.ts b/packages/init/src/action/configs.test.ts
index af2607047..879c63811 100644
--- a/packages/init/src/action/configs.test.ts
+++ b/packages/init/src/action/configs.test.ts
@@ -258,6 +258,13 @@ test("patchFiles preserves Nitro's generated tsconfig extends", async () => {
   "extends": "./.nitro/types/tsconfig.json",
   "compilerOptions": {
     "types": ["node"],
+    "paths": {
+      "~/api/*": ["./server/api/*"],
+    },
+  },
+  "metadata": {
+    "homepage": "https://example.com/docs",
+    "commentPattern": "keep // this and /* this */ text",
   },
 }
 `,
@@ -271,10 +278,20 @@ test("patchFiles preserves Nitro's generated tsconfig extends", async () => {
     ) as {
       extends?: string;
       compilerOptions?: Record<string, unknown>;
+      metadata?: Record<string, unknown>;
     };
     assert.equal(tsconfig.extends, "./.nitro/types/tsconfig.json");
     assert.deepEqual(tsconfig.compilerOptions?.types, ["node"]);
+    const paths = tsconfig.compilerOptions?.paths as
+      | Record<string, unknown>
+      | undefined;
+    assert.deepEqual(paths?.["~/api/*"], ["./server/api/*"]);
     assert.equal(tsconfig.compilerOptions?.moduleResolution, "Bundler");
+    assert.equal(tsconfig.metadata?.homepage, "https://example.com/docs");
+    assert.equal(
+      tsconfig.metadata?.commentPattern,
+      "keep // this and /* this */ text",
+    );
   } finally {
     await rm(dir, { recursive: true, force: true });
   }
diff --git a/packages/init/src/action/patch.ts b/packages/init/src/action/patch.ts
index 803fe9808..64d8d08c4 100644
--- a/packages/init/src/action/patch.ts
+++ b/packages/init/src/action/patch.ts
@@ -4,7 +4,7 @@ import { access, readFile } from "node:fs/promises";
 import { join as joinPath } from "node:path";
 import { createFile, throwUnlessNotExists } from "../lib.ts";
 import type { InitCommandData } from "../types.ts";
-import { formatJson, merge, replaceAll, set } from "../utils.ts";
+import { formatJson, merge, set } from "../utils.ts";
 import {
   devToolConfigs,
   loadDenoConfig,
@@ -315,13 +315,78 @@ const mergeJson = (prev: string, data: object): string =>
  * @param jsonString - The JSON string potentially containing JSONC syntax
  * @returns JSON string with JSONC-only syntax removed
  */
-const removeJsoncSyntax = (jsonString: string): string =>
-  pipe(
-    jsonString,
-    replaceAll(/\/\/.*$/gm, ""),
-    replaceAll(/\/\*[\s\S]*?\*\//g, ""),
-    replaceAll(/,(\s*[}\]])/g, "$1"),
-  );
+const removeJsoncSyntax = (jsonString: string): string => {
+  let output = "";
+  let index = 0;
+  let inString = false;
+  let escaped = false;
+
+  while (index < jsonString.length) {
+    const char = jsonString[index]!;
+    const next = jsonString[index + 1];
+
+    if (inString) {
+      output += char;
+      if (escaped) {
+        escaped = false;
+      } else if (char === "\\") {
+        escaped = true;
+      } else if (char === '"') {
+        inString = false;
+      }
+      index++;
+      continue;
+    }
+
+    if (char === '"') {
+      inString = true;
+      output += char;
+      index++;
+      continue;
+    }
+
+    if (char === "/" && next === "/") {
+      index += 2;
+      while (
+        index < jsonString.length &&
+        jsonString[index] !== "\n" &&
+        jsonString[index] !== "\r"
+      ) {
+        index++;
+      }
+      continue;
+    }
+
+    if (char === "/" && next === "*") {
+      index += 2;
+      while (index < jsonString.length) {
+        const blockChar = jsonString[index]!;
+        const blockNext = jsonString[index + 1];
+        if (blockChar === "*" && blockNext === "/") {
+          index += 2;
+          break;
+        }
+        if (blockChar === "\n" || blockChar === "\r") output += blockChar;
+        index++;
+      }
+      continue;
+    }
+
+    if (char === ",") {
+      let lookahead = index + 1;
+      while (/\s/.test(jsonString[lookahead] ?? "")) lookahead++;
+      if (jsonString[lookahead] === "}" || jsonString[lookahead] === "]") {
+        index++;
+        continue;
+      }
+    }
+
+    output += char;
+    index++;
+  }
+
+  return output;
+};
 
 /**
  * Appends new text content to existing text content line by line.

From 957a5a9dfd185e96de61e457d1fa79c6d2cc984e Mon Sep 17 00:00:00 2001
From: Hong Minhee <hong@minhee.org>
Date: Wed, 24 Jun 2026 05:30:56 +0900
Subject: [PATCH 06/13] Omit unserializable JSON object values

The custom JSON formatter now matches JSON.stringify for object properties
whose values cannot be serialized.  Function, symbol, and undefined property
values are omitted, while array entries still serialize to null.

https://github.com/fedify-dev/fedify/pull/818#discussion_r3462619827

Assisted-by: Codex:gpt-5.5
---
 packages/init/src/utils.test.ts | 13 +++++++++++++
 packages/init/src/utils.ts      |  4 +++-
 2 files changed, 16 insertions(+), 1 deletion(-)

diff --git a/packages/init/src/utils.test.ts b/packages/init/src/utils.test.ts
index c0f246ee4..910e52ea8 100644
--- a/packages/init/src/utils.test.ts
+++ b/packages/init/src/utils.test.ts
@@ -23,3 +23,16 @@ test("formatJson serializes values with toJSON methods", () => {
     '{\n  "stamp": "2026-06-24T00:00:00.000Z",\n  "custom": {\n    "value": "serialized"\n  }\n}\n',
   );
 });
+
+test("formatJson omits unserializable object property values", () => {
+  assert.equal(
+    formatJson({
+      keep: "value",
+      skipUndefined: undefined,
+      skipFunction: () => "value",
+      skipSymbol: Symbol("value"),
+      array: [undefined, () => "value", Symbol("value")],
+    }),
+    '{\n  "keep": "value",\n  "array": [null, null, null]\n}\n',
+  );
+});
diff --git a/packages/init/src/utils.ts b/packages/init/src/utils.ts
index 4dc530f5e..dd4bc67bd 100644
--- a/packages/init/src/utils.ts
+++ b/packages/init/src/utils.ts
@@ -142,7 +142,9 @@ function formatJsonObject(
   depth: number,
 ): string {
   const entries = Object.entries(object).filter(([, value]) =>
-    value !== undefined
+    value !== undefined &&
+    typeof value !== "function" &&
+    typeof value !== "symbol"
   );
   if (entries.length === 0) return "{}";
   const childIndent = indent(depth + 1);

From a2668470d5ac1a2dcbc2fc85335dee60ad97776c Mon Sep 17 00:00:00 2001
From: Hong Minhee <hong@minhee.org>
Date: Wed, 24 Jun 2026 09:21:26 +0900
Subject: [PATCH 07/13] Use jsonc-parser for config merging

The init patch step now parses existing JSONC files with jsonc-parser instead
of maintaining a custom comment and trailing comma scanner.  This preserves
string contents, handles comments between trailing commas and closing tokens,
and keeps Nitro tsconfig merging on a tested parser.

https://github.com/fedify-dev/fedify/pull/818#discussion_r3462758286
https://github.com/fedify-dev/fedify/pull/818#discussion_r3462773183

Assisted-by: Codex:gpt-5.5
---
 deno.json                                |   1 +
 deno.lock                                |   9 +-
 packages/init/package.json               |   3 +-
 packages/init/src/action/configs.test.ts |   8 +-
 packages/init/src/action/patch.ts        | 103 ++++++-----------------
 pnpm-lock.yaml                           |   8 ++
 6 files changed, 49 insertions(+), 83 deletions(-)

diff --git a/deno.json b/deno.json
index c7412369b..03f1f929b 100644
--- a/deno.json
+++ b/deno.json
@@ -78,6 +78,7 @@
     "hono": "jsr:@hono/hono@^4.8.3",
     "ioredis": "npm:ioredis@^5.8.2",
     "json-preserve-indent": "npm:json-preserve-indent@^1.1.3",
+    "jsonc-parser": "npm:jsonc-parser@^3.3.1",
     "mysql2": "npm:mysql2@^3.22.3",
     "mysql2/promise": "npm:mysql2@^3.22.3/promise",
     "postgres": "npm:postgres@^3.4.7",
diff --git a/deno.lock b/deno.lock
index 601e31b62..8d3d97c57 100644
--- a/deno.lock
+++ b/deno.lock
@@ -145,6 +145,7 @@
     "npm:jimp@^1.6.1": "1.6.1",
     "npm:json-canon@^1.0.1": "1.0.1",
     "npm:json-preserve-indent@^1.1.3": "1.1.3",
+    "npm:jsonc-parser@^3.3.1": "3.3.1",
     "npm:jsonld@9": "9.0.0",
     "npm:koa@2": "2.16.4",
     "npm:miniflare@^4.20250523.0": "4.20250906.0",
@@ -6160,6 +6161,9 @@
       "integrity": "sha512-XmOWe7eyHYH14cLdVPoyg+GOH3rYX++KpzrylJwSW98t3Nk+U8XOl8FWKOgwtzdb8lXGf6zYwDUzeHMWfxasyg==",
       "bin": true
     },
+    "jsonc-parser@3.3.1": {
+      "integrity": "sha512-HUgH65KyejrUFPvHFPbqOY0rsFip3Bo5wb4ngvdi1EpCYWUQDC5V+Y7mZws+DLkr4M//zQJoanu1SP+87Dv1oQ=="
+    },
     "jsonld@9.0.0": {
       "integrity": "sha512-pjMIdkXfC1T2wrX9B9i2uXhGdyCmgec3qgMht+TDj+S0qX3bjWMQUfL7NeqEhuRTi8G5ESzmL9uGlST7nzSEWg==",
       "dependencies": [
@@ -8611,6 +8615,7 @@
       "optionalPeers": [
         "typescript"
       ],
+      "deprecated": true,
       "bin": true
     },
     "tsdown@0.22.0_tsx@4.21.0": {
@@ -9488,6 +9493,7 @@
       "npm:h3@^1.15.0",
       "npm:ioredis@^5.8.2",
       "npm:json-preserve-indent@^1.1.3",
+      "npm:jsonc-parser@^3.3.1",
       "npm:mysql2@^3.22.3",
       "npm:postgres@^3.4.7",
       "npm:preact@10.19.6",
@@ -9664,7 +9670,8 @@
           "dependencies": [
             "npm:@inquirer/prompts@^7.8.4",
             "npm:dax@~0.46.1",
-            "npm:inquirer-toggle@^1.0.1"
+            "npm:inquirer-toggle@^1.0.1",
+            "npm:jsonc-parser@^3.3.1"
           ]
         }
       },
diff --git a/packages/init/package.json b/packages/init/package.json
index 116491e2a..42210f1f7 100644
--- a/packages/init/package.json
+++ b/packages/init/package.json
@@ -56,7 +56,8 @@
     "@optique/run": "catalog:",
     "chalk": "catalog:",
     "es-toolkit": "catalog:",
-    "inquirer-toggle": "^1.0.1"
+    "inquirer-toggle": "^1.0.1",
+    "jsonc-parser": "^3.3.1"
   },
   "devDependencies": {
     "@types/node": "catalog:",
diff --git a/packages/init/src/action/configs.test.ts b/packages/init/src/action/configs.test.ts
index 879c63811..80fdf26aa 100644
--- a/packages/init/src/action/configs.test.ts
+++ b/packages/init/src/action/configs.test.ts
@@ -257,14 +257,16 @@ test("patchFiles preserves Nitro's generated tsconfig extends", async () => {
   // https://nitro.build/guide/typescript
   "extends": "./.nitro/types/tsconfig.json",
   "compilerOptions": {
-    "types": ["node"],
+    "types": [
+      "node", // runtime types
+    ],
     "paths": {
       "~/api/*": ["./server/api/*"],
-    },
+    }, /* aliases */
   },
   "metadata": {
     "homepage": "https://example.com/docs",
-    "commentPattern": "keep // this and /* this */ text",
+    "commentPattern": "keep // this and /* this */ text", // string remains
   },
 }
 `,
diff --git a/packages/init/src/action/patch.ts b/packages/init/src/action/patch.ts
index 64d8d08c4..4c9eb3278 100644
--- a/packages/init/src/action/patch.ts
+++ b/packages/init/src/action/patch.ts
@@ -1,5 +1,10 @@
 import { always, apply, entries, map, pipe, pipeLazy, tap } from "@fxts/core";
 import { toMerged } from "es-toolkit";
+import {
+  parse as parseJsonc,
+  type ParseError,
+  printParseErrorCode,
+} from "jsonc-parser";
 import { access, readFile } from "node:fs/promises";
 import { join as joinPath } from "node:path";
 import { createFile, throwUnlessNotExists } from "../lib.ts";
@@ -302,90 +307,32 @@ async function patchContent(
  * @returns Formatted JSON string with merged content
  */
 const mergeJson = (prev: string, data: object): string =>
-  pipe(
-    prev ? JSON.parse(removeJsoncSyntax(prev)) : {},
-    merge(data),
-    formatJson,
-  );
+  formatJson(merge(data)(prev ? parseJsoncObject(prev) : {}));
 
 /**
- * Removes single-line (//) comments, multi-line (/* *\/) comments, and
- * trailing commas from a JSONC string.
+ * Parses a JSONC string, accepting comments and trailing commas.
  *
  * @param jsonString - The JSON string potentially containing JSONC syntax
- * @returns JSON string with JSONC-only syntax removed
+ * @returns Parsed JSON value
  */
-const removeJsoncSyntax = (jsonString: string): string => {
-  let output = "";
-  let index = 0;
-  let inString = false;
-  let escaped = false;
-
-  while (index < jsonString.length) {
-    const char = jsonString[index]!;
-    const next = jsonString[index + 1];
-
-    if (inString) {
-      output += char;
-      if (escaped) {
-        escaped = false;
-      } else if (char === "\\") {
-        escaped = true;
-      } else if (char === '"') {
-        inString = false;
-      }
-      index++;
-      continue;
-    }
-
-    if (char === '"') {
-      inString = true;
-      output += char;
-      index++;
-      continue;
-    }
-
-    if (char === "/" && next === "/") {
-      index += 2;
-      while (
-        index < jsonString.length &&
-        jsonString[index] !== "\n" &&
-        jsonString[index] !== "\r"
-      ) {
-        index++;
-      }
-      continue;
-    }
-
-    if (char === "/" && next === "*") {
-      index += 2;
-      while (index < jsonString.length) {
-        const blockChar = jsonString[index]!;
-        const blockNext = jsonString[index + 1];
-        if (blockChar === "*" && blockNext === "/") {
-          index += 2;
-          break;
-        }
-        if (blockChar === "\n" || blockChar === "\r") output += blockChar;
-        index++;
-      }
-      continue;
-    }
-
-    if (char === ",") {
-      let lookahead = index + 1;
-      while (/\s/.test(jsonString[lookahead] ?? "")) lookahead++;
-      if (jsonString[lookahead] === "}" || jsonString[lookahead] === "]") {
-        index++;
-        continue;
-      }
-    }
-
-    output += char;
-    index++;
+const parseJsoncObject = (
+  jsonString: string,
+): Record<PropertyKey, unknown> => {
+  const errors: ParseError[] = [];
+  const value = parseJsonc(jsonString, errors, { allowTrailingComma: true });
+  if (errors.length > 0) {
+    throw new SyntaxError(
+      errors
+        .map(({ error, offset }) =>
+          `${printParseErrorCode(error)} at ${offset}`
+        )
+        .join("; "),
+    );
   }
-
-  return output;
+  if (value === null || typeof value !== "object" || Array.isArray(value)) {
+    throw new SyntaxError("Expected a JSON object.");
+  }
+  return value as Record<PropertyKey, unknown>;
 };
 
 /**
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index 1f2341172..1c093afb8 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -1370,6 +1370,9 @@ importers:
       inquirer-toggle:
         specifier: ^1.0.1
         version: 1.0.1
+      jsonc-parser:
+        specifier: ^3.3.1
+        version: 3.3.1
     devDependencies:
       '@types/node':
         specifier: 'catalog:'
@@ -9445,6 +9448,9 @@ packages:
     engines: {node: '>=6'}
     hasBin: true
 
+  jsonc-parser@3.3.1:
+    resolution: {integrity: sha512-HUgH65KyejrUFPvHFPbqOY0rsFip3Bo5wb4ngvdi1EpCYWUQDC5V+Y7mZws+DLkr4M//zQJoanu1SP+87Dv1oQ==}
+
   jsonld@9.0.0:
     resolution: {integrity: sha512-pjMIdkXfC1T2wrX9B9i2uXhGdyCmgec3qgMht+TDj+S0qX3bjWMQUfL7NeqEhuRTi8G5ESzmL9uGlST7nzSEWg==}
     engines: {node: '>=18'}
@@ -21449,6 +21455,8 @@ snapshots:
 
   json5@2.2.3: {}
 
+  jsonc-parser@3.3.1: {}
+
   jsonld@9.0.0:
     dependencies:
       '@digitalbazaar/http-client': 4.2.0

From 2cef905a264b1f01d997274506fd55e9b83ec653 Mon Sep 17 00:00:00 2001
From: Hong Minhee <hong@minhee.org>
Date: Wed, 24 Jun 2026 12:04:09 +0900
Subject: [PATCH 08/13] Scope Oxc ignores by framework

The generated Oxfmt and Oxlint configs now start from shared default ignore
patterns and merge in framework-specific build directories from the selected
initializer.  Next.js, Nitro, Nuxt, and SolidStart no longer leak their output
folders into unrelated scaffolds.

The generated Oxfmt and Oxlint ignore pattern lists are built through the same
path, so their ordering and contents stay aligned.

https://github.com/fedify-dev/fedify/pull/818#discussion_r3464129729
https://github.com/fedify-dev/fedify/pull/818#discussion_r3464148161

Assisted-by: Codex:gpt-5.5
---
 packages/init/src/action/configs.test.ts      | 44 +++++++++++++++++--
 packages/init/src/action/configs.ts           | 29 ++++++++++++
 packages/init/src/action/patch.ts             |  7 ++-
 packages/init/src/json/oxfmt.json             |  4 --
 packages/init/src/json/oxlint.json            |  6 +--
 packages/init/src/types.ts                    |  4 ++
 packages/init/src/webframeworks/next.ts       |  3 ++
 packages/init/src/webframeworks/nitro.ts      |  3 ++
 packages/init/src/webframeworks/nuxt.ts       |  3 ++
 packages/init/src/webframeworks/solidstart.ts |  3 ++
 10 files changed, 91 insertions(+), 15 deletions(-)

diff --git a/packages/init/src/action/configs.test.ts b/packages/init/src/action/configs.test.ts
index 80fdf26aa..a2ab47a04 100644
--- a/packages/init/src/action/configs.test.ts
+++ b/packages/init/src/action/configs.test.ts
@@ -159,10 +159,14 @@ test("patchFiles creates Oxfmt and Oxlint configs for npm projects", async () =>
     );
     assert.equal(oxfmtConfig.sortPackageJson, false);
     assert.equal(oxfmtConfig.tabWidth, 2);
-    assert.ok(oxfmtConfig.ignorePatterns?.includes("node_modules/**"));
-    assert.ok(oxfmtConfig.ignorePatterns?.includes("**/*.md"));
-    assert.ok(oxlintConfig.ignorePatterns?.includes("node_modules/**"));
-    assert.ok(oxlintConfig.ignorePatterns?.includes("**/*.md"));
+    assert.deepEqual(oxfmtConfig.ignorePatterns, [
+      "**/*.md",
+      "build/**",
+      "coverage/**",
+      "dist/**",
+      "node_modules/**",
+    ]);
+    assert.deepEqual(oxlintConfig.ignorePatterns, oxfmtConfig.ignorePatterns);
     assert.deepEqual(oxlintConfig.jsPlugins, ["@fedify/lint/oxlint"]);
     assert.equal(
       oxlintConfig.rules?.["@fedify/lint/actor-id-required"],
@@ -201,6 +205,38 @@ test("patchFiles keeps generated Deno federation file formatted", async () => {
   }
 });
 
+test("patchFiles adds framework-specific Oxc ignore patterns", async () => {
+  const dir = await mkdtemp(join(tmpdir(), "fedify-init-next-oxc-"));
+
+  try {
+    const data = await createNextNpmInitData(dir);
+    await patchFiles(data);
+
+    const oxfmtConfig = JSON.parse(
+      await readFile(join(dir, ".oxfmtrc.json"), "utf8"),
+    ) as {
+      ignorePatterns?: string[];
+    };
+    const oxlintConfig = JSON.parse(
+      await readFile(join(dir, ".oxlintrc.json"), "utf8"),
+    ) as {
+      ignorePatterns?: string[];
+    };
+
+    assert.deepEqual(oxfmtConfig.ignorePatterns, [
+      "**/*.md",
+      ".next/**",
+      "build/**",
+      "coverage/**",
+      "dist/**",
+      "node_modules/**",
+    ]);
+    assert.deepEqual(oxlintConfig.ignorePatterns, oxfmtConfig.ignorePatterns);
+  } finally {
+    await rm(dir, { recursive: true, force: true });
+  }
+});
+
 test("cleanupScaffoldedFiles removes Next.js ESLint artifacts", async () => {
   const dir = await mkdtemp(join(tmpdir(), "fedify-init-next-cleanup-"));
 
diff --git a/packages/init/src/action/configs.ts b/packages/init/src/action/configs.ts
index da8590123..dc29798c5 100644
--- a/packages/init/src/action/configs.ts
+++ b/packages/init/src/action/configs.ts
@@ -170,6 +170,35 @@ export const loadPackageJson = (
   },
 });
 
+export const loadOxfmtConfig = (
+  data: InitCommandData,
+) => ({
+  path: joinPath(".oxfmtrc.json"),
+  data: withFormatIgnorePatterns(oxfmt, data),
+});
+
+export const loadOxlintConfig = (
+  data: InitCommandData,
+) => ({
+  path: joinPath(".oxlintrc.json"),
+  data: withFormatIgnorePatterns(oxlint, data),
+});
+
+const withFormatIgnorePatterns = <
+  T extends { ignorePatterns?: string[] },
+>(
+  config: T,
+  data: InitCommandData,
+): T => ({
+  ...config,
+  ignorePatterns: [
+    ...new Set([
+      ...(config.ignorePatterns ?? []),
+      ...(data.initializer.format?.ignorePatterns ?? []),
+    ]),
+  ].sort(),
+});
+
 /**
  * Configuration objects for various development tool setup files.
  * Contains predefined configurations for code formatting, VS Code settings, and extensions
diff --git a/packages/init/src/action/patch.ts b/packages/init/src/action/patch.ts
index 4c9eb3278..68c5b9481 100644
--- a/packages/init/src/action/patch.ts
+++ b/packages/init/src/action/patch.ts
@@ -13,6 +13,8 @@ import { formatJson, merge, set } from "../utils.ts";
 import {
   devToolConfigs,
   loadDenoConfig,
+  loadOxfmtConfig,
+  loadOxlintConfig,
   loadPackageJson,
   loadTsConfig,
 } from "./configs.ts";
@@ -49,6 +51,7 @@ export const getJsonsCacheKey = (data: JsonConfigData): string =>
       compilerOptions: data.initializer.compilerOptions ?? {},
       dependencies: data.initializer.dependencies ?? {},
       devDependencies: data.initializer.devDependencies ?? {},
+      format: data.initializer.format ?? {},
       tasks: data.initializer.tasks ?? {},
     },
     kv: {
@@ -159,8 +162,8 @@ const getJsons = <
         ? { "tsconfig.json": loadTsConfig(data).data }
         : {}),
       "package.json": loadPackageJson(data).data,
-      [devToolConfigs["oxfmt"].path]: devToolConfigs["oxfmt"].data,
-      [devToolConfigs["oxlint"].path]: devToolConfigs["oxlint"].data,
+      [devToolConfigs["oxfmt"].path]: loadOxfmtConfig(data).data,
+      [devToolConfigs["oxlint"].path]: loadOxlintConfig(data).data,
       [devToolConfigs["vscSet"].path]: devToolConfigs["vscSet"].data,
       [devToolConfigs["vscExt"].path]: devToolConfigs["vscExt"].data,
     };
diff --git a/packages/init/src/json/oxfmt.json b/packages/init/src/json/oxfmt.json
index f916eac05..57e929f24 100644
--- a/packages/init/src/json/oxfmt.json
+++ b/packages/init/src/json/oxfmt.json
@@ -1,10 +1,6 @@
 {
   "$schema": "./node_modules/oxfmt/configuration_schema.json",
   "ignorePatterns": [
-    ".next/**",
-    ".output/**",
-    ".solid/**",
-    ".vinxi/**",
     "**/*.md",
     "build/**",
     "coverage/**",
diff --git a/packages/init/src/json/oxlint.json b/packages/init/src/json/oxlint.json
index fea575bfe..92d48dd70 100644
--- a/packages/init/src/json/oxlint.json
+++ b/packages/init/src/json/oxlint.json
@@ -1,14 +1,10 @@
 {
   "$schema": "https://raw.githubusercontent.com/oxc-project/oxc/main/npm/oxlint/configuration_schema.json",
   "ignorePatterns": [
-    ".next/**",
-    ".output/**",
-    ".solid/**",
-    ".vinxi/**",
+    "**/*.md",
     "build/**",
     "coverage/**",
     "dist/**",
-    "**/*.md",
     "node_modules/**"
   ],
   "jsPlugins": [
diff --git a/packages/init/src/types.ts b/packages/init/src/types.ts
index 06181fab3..fed712795 100644
--- a/packages/init/src/types.ts
+++ b/packages/init/src/types.ts
@@ -98,6 +98,10 @@ export interface WebFrameworkInitializer {
    *  default value.  Merged together with KV store and message queue env vars
    *  into the generated `.env` file. */
   env?: Record<string, string>;
+  /** Formatter and linter options to merge into generated tool configs. */
+  format?: {
+    ignorePatterns?: string[];
+  };
   /** TypeScript compiler options to include in `tsconfig.json`. */
   compilerOptions?: Record<string, string | boolean | number | string[] | null>;
   /** Task scripts keyed by task name (e.g., `"dev"`, `"prod"`, `"lint"`). */
diff --git a/packages/init/src/webframeworks/next.ts b/packages/init/src/webframeworks/next.ts
index 3870f4dcd..5c8e95bcc 100644
--- a/packages/init/src/webframeworks/next.ts
+++ b/packages/init/src/webframeworks/next.ts
@@ -26,6 +26,9 @@ const nextDescription: WebFrameworkDescription = {
     },
     federationFile: "federation/index.ts",
     loggingFile: "logging.ts",
+    format: {
+      ignorePatterns: [".next/**"],
+    },
     files: {
       "instrumentation.ts": await readTemplate("next/instrumentation.ts"),
       "middleware.ts": await readTemplate("next/middleware.ts"),
diff --git a/packages/init/src/webframeworks/nitro.ts b/packages/init/src/webframeworks/nitro.ts
index d3a263d79..915e17599 100644
--- a/packages/init/src/webframeworks/nitro.ts
+++ b/packages/init/src/webframeworks/nitro.ts
@@ -18,6 +18,9 @@ const nitroDescription: WebFrameworkDescription = {
     devDependencies: defaultDevDependencies,
     federationFile: "server/federation.ts",
     loggingFile: "server/logging.ts",
+    format: {
+      ignorePatterns: [".output/**"],
+    },
     env: testMode ? { HOST: "127.0.0.1" } : {} as Record<string, string>,
     files: {
       "server/plugins/logging.ts": await readTemplate(
diff --git a/packages/init/src/webframeworks/nuxt.ts b/packages/init/src/webframeworks/nuxt.ts
index babe49de0..ed66c3568 100644
--- a/packages/init/src/webframeworks/nuxt.ts
+++ b/packages/init/src/webframeworks/nuxt.ts
@@ -20,6 +20,9 @@ const nuxtDescription: WebFrameworkDescription = {
     federationFile: "server/federation.ts",
     loggingFile: "server/logging.ts",
     loggingTemplate: "nuxt/server/logging.ts",
+    format: {
+      ignorePatterns: [".output/**"],
+    },
     env: testMode ? { HOST: "127.0.0.1" } : {} as Record<string, string>,
     files: {
       "nuxt.config.ts": await readTemplate("nuxt/nuxt.config.ts"),
diff --git a/packages/init/src/webframeworks/solidstart.ts b/packages/init/src/webframeworks/solidstart.ts
index 35e33dc57..eae2a8ed9 100644
--- a/packages/init/src/webframeworks/solidstart.ts
+++ b/packages/init/src/webframeworks/solidstart.ts
@@ -19,6 +19,9 @@ const solidstartDescription: WebFrameworkDescription = {
     },
     federationFile: "src/federation.ts",
     loggingFile: "src/logging.ts",
+    format: {
+      ignorePatterns: [".solid/**", ".vinxi/**"],
+    },
     files: {
       "app.config.ts": (await readTemplate("solidstart/app.config.ts"))
         .replace(

From f8eecd413d51b10cac8605440b79b05178326e77 Mon Sep 17 00:00:00 2001
From: Hong Minhee <hong@minhee.org>
Date: Wed, 24 Jun 2026 12:04:37 +0900
Subject: [PATCH 09/13] Simplify JSON formatting guard

formatJson now delegates serialization details back to JSON.stringify and uses
a small replacer only to enforce the maximum object depth.  This keeps the
existing safety check while avoiding a large custom serializer for standard JSON
semantics.

https://github.com/fedify-dev/fedify/pull/818#discussion_r3464222021

Assisted-by: Codex:gpt-5.5
---
 packages/init/src/utils.test.ts |  2 +-
 packages/init/src/utils.ts      | 93 ++++++++-------------------------
 2 files changed, 22 insertions(+), 73 deletions(-)

diff --git a/packages/init/src/utils.test.ts b/packages/init/src/utils.test.ts
index 910e52ea8..9ae2a927e 100644
--- a/packages/init/src/utils.test.ts
+++ b/packages/init/src/utils.test.ts
@@ -33,6 +33,6 @@ test("formatJson omits unserializable object property values", () => {
       skipSymbol: Symbol("value"),
       array: [undefined, () => "value", Symbol("value")],
     }),
-    '{\n  "keep": "value",\n  "array": [null, null, null]\n}\n',
+    '{\n  "keep": "value",\n  "array": [\n    null,\n    null,\n    null\n  ]\n}\n',
   );
 });
diff --git a/packages/init/src/utils.ts b/packages/init/src/utils.ts
index dd4bc67bd..9af00d263 100644
--- a/packages/init/src/utils.ts
+++ b/packages/init/src/utils.ts
@@ -85,82 +85,31 @@ export const replaceAll = (
 (text: string): string => text.replaceAll(pattern, replacement as string);
 
 /** Serializes a value to a pretty-printed JSON string with a trailing newline. */
-export const formatJson = (obj: unknown) => formatJsonValue(obj, 0) + "\n";
+export const formatJson = (obj: unknown) =>
+  JSON.stringify(obj, createJsonDepthGuard(), 2) + "\n";
 
 const MAX_JSON_FORMAT_DEPTH = 100;
 
-function formatJsonValue(
+const createJsonDepthGuard = (): (
+  this: unknown,
+  key: string,
   value: unknown,
-  depth: number,
-  toJSONDepth = 0,
-): string {
-  if (depth > MAX_JSON_FORMAT_DEPTH) {
-    throw new RangeError("Maximum depth exceeded while formatting JSON.");
-  }
-  if (toJSONDepth > MAX_JSON_FORMAT_DEPTH) {
-    throw new RangeError("Maximum depth exceeded while formatting JSON.");
-  }
-  if (hasToJSON(value)) {
-    return formatJsonValue(value.toJSON(), depth, toJSONDepth + 1);
-  }
-  if (Array.isArray(value)) return formatJsonArray(value, depth);
-  if (value !== null && typeof value === "object") {
-    return formatJsonObject(value as Record<string, unknown>, depth);
-  }
-  return formatJsonPrimitive(value);
-}
-
-function hasToJSON(value: unknown): value is { toJSON: () => unknown } {
-  return value !== null &&
-    typeof value === "object" &&
-    typeof (value as { toJSON?: unknown }).toJSON === "function";
-}
-
-function formatJsonArray(values: unknown[], depth: number): string {
-  if (values.length === 0) return "[]";
-  const canCompact = values.every((value) =>
-    value == null || typeof value !== "object"
-  );
-  const compact = canCompact
-    ? `[${values.map(formatJsonPrimitive).join(", ")}]`
-    : "";
-  if (
-    canCompact &&
-    compact.length <= 80
-  ) {
-    return compact;
-  }
-  const childIndent = indent(depth + 1);
-  return `[\n${
-    values.map((value) => `${childIndent}${formatJsonValue(value, depth + 1)}`)
-      .join(",\n")
-  }\n${indent(depth)}]`;
-}
-
-function formatJsonObject(
-  object: Record<string, unknown>,
-  depth: number,
-): string {
-  const entries = Object.entries(object).filter(([, value]) =>
-    value !== undefined &&
-    typeof value !== "function" &&
-    typeof value !== "symbol"
-  );
-  if (entries.length === 0) return "{}";
-  const childIndent = indent(depth + 1);
-  return `{\n${
-    entries.map(([key, value]) =>
-      `${childIndent}${JSON.stringify(key)}: ${
-        formatJsonValue(value, depth + 1)
-      }`
-    ).join(",\n")
-  }\n${indent(depth)}}`;
-}
-
-const indent = (depth: number): string => "  ".repeat(depth);
-
-const formatJsonPrimitive = (value: unknown): string =>
-  JSON.stringify(value) ?? "null";
+) => unknown => {
+  const depths = new WeakMap<object, number>();
+  return function (_key, value) {
+    if (value !== null && typeof value === "object") {
+      const parentDepth = this !== null && typeof this === "object"
+        ? depths.get(this) ?? 0
+        : 0;
+      const depth = parentDepth + 1;
+      if (depth > MAX_JSON_FORMAT_DEPTH) {
+        throw new RangeError("Maximum depth exceeded while formatting JSON.");
+      }
+      depths.set(value, depth);
+    }
+    return value;
+  };
+};
 
 /** Checks whether a string or array-like value has a length greater than zero. */
 export const notEmpty = <T extends string | { length: number }>(s: T) =>

From 7409f37d3c0af3ba612d20544bc0ff19eb735d00 Mon Sep 17 00:00:00 2001
From: Hong Minhee <hong@minhee.org>
Date: Wed, 24 Jun 2026 12:52:14 +0900
Subject: [PATCH 10/13] Tighten scaffold cleanup

Scaffold cleanup now ignores empty cleanup file paths before removing files,
which avoids accidentally targeting the project directory if a blank entry ever
reaches cleanupFiles.

Nitro Node.js and Bun projects also remove lint-related dependencies from the
upstream scaffold before Fedify merges Oxfmt and Oxlint into package.json, so
generated projects do not keep the old ESLint and Prettier stack.

https://github.com/fedify-dev/fedify/pull/818#discussion_r3464283694
https://github.com/fedify-dev/fedify/pull/818#discussion_r3464308284

Assisted-by: Codex:gpt-5.5
---
 packages/init/src/action/cleanup.ts      |  6 +--
 packages/init/src/action/configs.test.ts | 56 ++++++++++++++++++++++++
 packages/init/src/webframeworks/nitro.ts |  3 ++
 3 files changed, 62 insertions(+), 3 deletions(-)

diff --git a/packages/init/src/action/cleanup.ts b/packages/init/src/action/cleanup.ts
index 7069f160c..542b9b857 100644
--- a/packages/init/src/action/cleanup.ts
+++ b/packages/init/src/action/cleanup.ts
@@ -8,9 +8,9 @@ export async function cleanupScaffoldedFiles(
   { dir, initializer }: InitCommandData,
 ): Promise<void> {
   await Promise.all(
-    (initializer.cleanupFiles ?? []).map((path) =>
-      rm(joinPath(dir, path), { force: true, recursive: true })
-    ),
+    (initializer.cleanupFiles ?? [])
+      .filter((path) => path.trim() !== "")
+      .map((path) => rm(joinPath(dir, path), { force: true, recursive: true })),
   );
   await cleanupPackageJson(dir, initializer.cleanupPackageJson);
 }
diff --git a/packages/init/src/action/configs.test.ts b/packages/init/src/action/configs.test.ts
index a2ab47a04..b475c9fa5 100644
--- a/packages/init/src/action/configs.test.ts
+++ b/packages/init/src/action/configs.test.ts
@@ -282,6 +282,62 @@ test("cleanupScaffoldedFiles removes Next.js ESLint artifacts", async () => {
   }
 });
 
+test("cleanupScaffoldedFiles ignores empty cleanup file paths", async () => {
+  const dir = await mkdtemp(join(tmpdir(), "fedify-init-cleanup-empty-"));
+
+  try {
+    const data = await createNpmInitData(dir);
+    data.initializer.cleanupFiles = ["", "   ", "generated.txt"];
+    await writeFile(join(dir, "generated.txt"), "generated\n");
+    await writeFile(join(dir, "keep.txt"), "keep\n");
+
+    await cleanupScaffoldedFiles(data);
+
+    assert.equal(await readFile(join(dir, "keep.txt"), "utf8"), "keep\n");
+    await assert.rejects(readFile(join(dir, "generated.txt"), "utf8"), {
+      code: "ENOENT",
+    });
+  } finally {
+    await rm(dir, { recursive: true, force: true });
+  }
+});
+
+test("cleanupScaffoldedFiles removes Nitro lint artifacts", async () => {
+  const dir = await mkdtemp(join(tmpdir(), "fedify-init-nitro-cleanup-"));
+
+  try {
+    const data = await createNitroNpmInitData(dir);
+    await writeFile(
+      join(dir, "package.json"),
+      JSON.stringify({
+        devDependencies: {
+          eslint: "^9",
+          "eslint-config-unjs": "^0.5.0",
+          prettier: "^3",
+          typescript: "^5",
+        },
+      }),
+    );
+
+    await cleanupScaffoldedFiles(data);
+
+    const packageJson = JSON.parse(
+      await readFile(join(dir, "package.json"), "utf8"),
+    ) as {
+      devDependencies?: Record<string, string>;
+    };
+    assert.equal(packageJson.devDependencies?.eslint, undefined);
+    assert.equal(
+      packageJson.devDependencies?.["eslint-config-unjs"],
+      undefined,
+    );
+    assert.equal(packageJson.devDependencies?.prettier, undefined);
+    assert.equal(packageJson.devDependencies?.typescript, "^5");
+  } finally {
+    await rm(dir, { recursive: true, force: true });
+  }
+});
+
 test("patchFiles preserves Nitro's generated tsconfig extends", async () => {
   const dir = await mkdtemp(join(tmpdir(), "fedify-init-nitro-tsconfig-"));
 
diff --git a/packages/init/src/webframeworks/nitro.ts b/packages/init/src/webframeworks/nitro.ts
index 915e17599..a7f3682da 100644
--- a/packages/init/src/webframeworks/nitro.ts
+++ b/packages/init/src/webframeworks/nitro.ts
@@ -11,6 +11,9 @@ const nitroDescription: WebFrameworkDescription = {
   init: async ({ packageManager: pm, testMode }) => ({
     command: getNitroInitCommand(pm),
     cleanupFiles: pm === "deno" ? [] : ["server/routes/index.ts"],
+    cleanupPackageJson: pm === "deno" ? {} : {
+      devDependencies: ["eslint", "eslint-config-unjs", "prettier"],
+    },
     dependencies: {
       "@fedify/h3": PACKAGE_VERSION,
       ...(pm === "deno" && defaultDenoDependencies),

From a89818f53bfceb6c7c4c25121fac515016e0c954 Mon Sep 17 00:00:00 2001
From: Hong Minhee <hong@minhee.org>
Date: Wed, 24 Jun 2026 13:12:30 +0900
Subject: [PATCH 11/13] Keep cleanup paths inside projects

cleanupFiles entries are now resolved against the project directory before removing files.  Empty entries are still ignored, and traversal paths that would escape the project directory are rejected before rm runs.

A regression test verifies that a sibling file outside the project remains untouched when cleanup receives a ../ path.

https://github.com/fedify-dev/fedify/pull/818#discussion_r3464426318
https://github.com/fedify-dev/fedify/pull/818#discussion_r3464426333

Assisted-by: Codex:gpt-5.5
---
 packages/init/src/action/cleanup.ts      | 21 ++++++++++++++++++--
 packages/init/src/action/configs.test.ts | 25 +++++++++++++++++++++++-
 2 files changed, 43 insertions(+), 3 deletions(-)

diff --git a/packages/init/src/action/cleanup.ts b/packages/init/src/action/cleanup.ts
index 542b9b857..c6a349fe8 100644
--- a/packages/init/src/action/cleanup.ts
+++ b/packages/init/src/action/cleanup.ts
@@ -1,5 +1,10 @@
 import { readFile, rm, writeFile } from "node:fs/promises";
-import { join as joinPath } from "node:path";
+import {
+  isAbsolute,
+  join as joinPath,
+  relative as relativePath,
+  resolve as resolvePath,
+} from "node:path";
 import { throwUnlessNotExists } from "../lib.ts";
 import type { InitCommandData, WebFrameworkInitializer } from "../types.ts";
 import { formatJson } from "../utils.ts";
@@ -10,11 +15,23 @@ export async function cleanupScaffoldedFiles(
   await Promise.all(
     (initializer.cleanupFiles ?? [])
       .filter((path) => path.trim() !== "")
-      .map((path) => rm(joinPath(dir, path), { force: true, recursive: true })),
+      .map((path) =>
+        rm(resolveCleanupPath(dir, path), { force: true, recursive: true })
+      ),
   );
   await cleanupPackageJson(dir, initializer.cleanupPackageJson);
 }
 
+function resolveCleanupPath(dir: string, path: string): string {
+  const baseDir = resolvePath(dir);
+  const targetPath = resolvePath(baseDir, path);
+  const relative = relativePath(baseDir, targetPath);
+  if (relative.startsWith("..") || isAbsolute(relative)) {
+    throw new Error(`Cleanup path escapes project directory: ${path}`);
+  }
+  return targetPath;
+}
+
 async function cleanupPackageJson(
   dir: string,
   cleanup: WebFrameworkInitializer["cleanupPackageJson"],
diff --git a/packages/init/src/action/configs.test.ts b/packages/init/src/action/configs.test.ts
index b475c9fa5..2304004ef 100644
--- a/packages/init/src/action/configs.test.ts
+++ b/packages/init/src/action/configs.test.ts
@@ -1,6 +1,6 @@
 import assert from "node:assert/strict";
 import { execFile } from "node:child_process";
-import { mkdtemp, readFile, rm, writeFile } from "node:fs/promises";
+import { mkdir, mkdtemp, readFile, rm, writeFile } from "node:fs/promises";
 import { tmpdir } from "node:os";
 import { join } from "node:path";
 import test from "node:test";
@@ -302,6 +302,29 @@ test("cleanupScaffoldedFiles ignores empty cleanup file paths", async () => {
   }
 });
 
+test("cleanupScaffoldedFiles rejects cleanup path traversal", async () => {
+  const parent = await mkdtemp(join(tmpdir(), "fedify-init-cleanup-parent-"));
+  const dir = join(parent, "project");
+
+  try {
+    await mkdir(dir);
+    const data = await createNpmInitData(dir);
+    data.initializer.cleanupFiles = ["../outside.txt"];
+    await writeFile(join(parent, "outside.txt"), "outside\n");
+
+    await assert.rejects(
+      cleanupScaffoldedFiles(data),
+      new Error("Cleanup path escapes project directory: ../outside.txt"),
+    );
+    assert.equal(
+      await readFile(join(parent, "outside.txt"), "utf8"),
+      "outside\n",
+    );
+  } finally {
+    await rm(parent, { recursive: true, force: true });
+  }
+});
+
 test("cleanupScaffoldedFiles removes Nitro lint artifacts", async () => {
   const dir = await mkdtemp(join(tmpdir(), "fedify-init-nitro-cleanup-"));
 

From ff87d444f8112bdd0e1084b714f36f86271fec18 Mon Sep 17 00:00:00 2001
From: Hong Minhee <hong@minhee.org>
Date: Wed, 24 Jun 2026 13:30:17 +0900
Subject: [PATCH 12/13] Harden cleanup and Astro formatting

Cleanup paths now reject the project directory itself in addition to
paths that escape it, preventing a cleanup entry like . from deleting
the generated project.

Astro Node.js and Bun scaffolds now use Prettier with the Astro plugin
for formatting, while retaining Oxlint for linting.  The generated VS
Code settings and extension recommendations are adjusted so Astro
projects no longer point Oxc at a missing Oxfmt configuration.

https://github.com/fedify-dev/fedify/pull/818#discussion_r3464485421
https://github.com/fedify-dev/fedify/pull/818#discussion_r3464523854

Assisted-by: Codex:gpt-5.5
---
 packages/init/src/action/cleanup.ts      |   2 +-
 packages/init/src/action/configs.test.ts | 107 +++++++++++++++++++++++
 packages/init/src/action/configs.ts      |  35 ++++++++
 packages/init/src/action/patch.ts        |  10 ++-
 packages/init/src/json/deps.json         |   2 +
 packages/init/src/types.ts               |   1 +
 packages/init/src/webframeworks.test.ts  |  37 ++++++++
 packages/init/src/webframeworks/astro.ts |  24 +++--
 8 files changed, 209 insertions(+), 9 deletions(-)

diff --git a/packages/init/src/action/cleanup.ts b/packages/init/src/action/cleanup.ts
index c6a349fe8..3d253064a 100644
--- a/packages/init/src/action/cleanup.ts
+++ b/packages/init/src/action/cleanup.ts
@@ -26,7 +26,7 @@ function resolveCleanupPath(dir: string, path: string): string {
   const baseDir = resolvePath(dir);
   const targetPath = resolvePath(baseDir, path);
   const relative = relativePath(baseDir, targetPath);
-  if (relative.startsWith("..") || isAbsolute(relative)) {
+  if (relative === "" || relative.startsWith("..") || isAbsolute(relative)) {
     throw new Error(`Cleanup path escapes project directory: ${path}`);
   }
   return targetPath;
diff --git a/packages/init/src/action/configs.test.ts b/packages/init/src/action/configs.test.ts
index 2304004ef..36c1f63b8 100644
--- a/packages/init/src/action/configs.test.ts
+++ b/packages/init/src/action/configs.test.ts
@@ -9,6 +9,7 @@ import { message } from "@optique/core";
 import { kvStores, messageQueues } from "../lib.ts";
 import type { InitCommandData } from "../types.ts";
 import bareBonesDescription from "../webframeworks/bare-bones.ts";
+import astroDescription from "../webframeworks/astro.ts";
 import nextDescription from "../webframeworks/next.ts";
 import nitroDescription from "../webframeworks/nitro.ts";
 import nuxtDescription from "../webframeworks/nuxt.ts";
@@ -237,6 +238,59 @@ test("patchFiles adds framework-specific Oxc ignore patterns", async () => {
   }
 });
 
+test("patchFiles omits Oxfmt config for Astro npm projects", async () => {
+  const dir = await mkdtemp(join(tmpdir(), "fedify-init-astro-prettier-"));
+
+  try {
+    const data = await createAstroNpmInitData(dir);
+    await patchFiles(data);
+
+    const packageJson = JSON.parse(
+      await readFile(join(dir, "package.json"), "utf8"),
+    ) as {
+      scripts?: Record<string, string>;
+      devDependencies?: Record<string, string>;
+    };
+    const vscodeSettings = JSON.parse(
+      await readFile(join(dir, ".vscode", "settings.json"), "utf8"),
+    ) as Record<string, unknown>;
+    const vscodeExtensions = JSON.parse(
+      await readFile(join(dir, ".vscode", "extensions.json"), "utf8"),
+    ) as {
+      recommendations?: string[];
+    };
+    assert.equal(
+      packageJson.scripts?.format,
+      "prettier --plugin prettier-plugin-astro --write .",
+    );
+    assert.equal(
+      packageJson.scripts?.["format:check"],
+      "prettier --plugin prettier-plugin-astro --check .",
+    );
+    assert.equal(packageJson.scripts?.lint, "oxlint .");
+    assert.ok(packageJson.devDependencies?.["prettier"]);
+    assert.ok(packageJson.devDependencies?.["prettier-plugin-astro"]);
+    assert.equal(packageJson.devDependencies?.["oxfmt"], undefined);
+    assert.ok(packageJson.devDependencies?.["oxlint"]);
+    await assert.rejects(readFile(join(dir, ".oxfmtrc.json"), "utf8"), {
+      code: "ENOENT",
+    });
+    assert.equal(vscodeSettings["oxc.fmt.configPath"], undefined);
+    assert.deepEqual(vscodeSettings["[astro]"], {
+      "editor.defaultFormatter": "esbenp.prettier-vscode",
+      "editor.formatOnSave": true,
+    });
+    assert.deepEqual(vscodeExtensions.recommendations, [
+      "astro-build.astro-vscode",
+      "esbenp.prettier-vscode",
+      "oxc.oxc-vscode",
+    ]);
+    await readFile(join(dir, ".oxlintrc.json"), "utf8");
+  } finally {
+    await rm(dir, { recursive: true, force: true });
+  }
+});
+
 test("cleanupScaffoldedFiles removes Next.js ESLint artifacts", async () => {
   const dir = await mkdtemp(join(tmpdir(), "fedify-init-next-cleanup-"));
 
@@ -325,6 +379,24 @@ test("cleanupScaffoldedFiles rejects cleanup path traversal", async () => {
   }
 });
 
+test("cleanupScaffoldedFiles rejects project directory cleanup", async () => {
+  const dir = await mkdtemp(join(tmpdir(), "fedify-init-cleanup-root-"));
+
+  try {
+    const data = await createNpmInitData(dir);
+    data.initializer.cleanupFiles = ["."];
+    await writeFile(join(dir, "keep.txt"), "keep\n");
+
+    await assert.rejects(
+      cleanupScaffoldedFiles(data),
+      new Error("Cleanup path escapes project directory: ."),
+    );
+    assert.equal(await readFile(join(dir, "keep.txt"), "utf8"), "keep\n");
+  } finally {
+    await rm(dir, { recursive: true, force: true });
+  }
+});
+
 test("cleanupScaffoldedFiles removes Nitro lint artifacts", async () => {
   const dir = await mkdtemp(join(tmpdir(), "fedify-init-nitro-cleanup-"));
 
@@ -471,6 +543,41 @@ async function createNpmInitData(dir: string): Promise<InitCommandData> {
   return data;
 }
 
+async function createAstroNpmInitData(dir: string): Promise<InitCommandData> {
+  const initializer = await astroDescription.init({
+    command: "init",
+    projectName: "example",
+    packageManager: "npm",
+    webFramework: "astro",
+    kvStore: "in-memory",
+    messageQueue: "in-process",
+    dryRun: false,
+    allowNonEmpty: false,
+    skipInstall: false,
+    testMode: false,
+    dir,
+  });
+
+  const data = {
+    command: "init",
+    projectName: "example",
+    packageManager: "npm",
+    webFramework: "astro",
+    kvStore: "in-memory",
+    messageQueue: "in-process",
+    dryRun: false,
+    allowNonEmpty: false,
+    skipInstall: false,
+    testMode: false,
+    dir,
+    initializer,
+    kv: kvStores["in-memory"],
+    mq: messageQueues["in-process"],
+    env: {},
+  } satisfies InitCommandData;
+  return data;
+}
+
 async function createDenoInitData(dir: string): Promise<InitCommandData> {
   const initializer = await bareBonesDescription.init({
     command: "init",
diff --git a/packages/init/src/action/configs.ts b/packages/init/src/action/configs.ts
index dc29798c5..21c14117b 100644
--- a/packages/init/src/action/configs.ts
+++ b/packages/init/src/action/configs.ts
@@ -184,6 +184,30 @@ export const loadOxlintConfig = (
   data: withFormatIgnorePatterns(oxlint, data),
 });
 
+export const loadVscodeSettings = (
+  data: InitCommandData,
+) => ({
+  path: devToolConfigs.vscSet.path,
+  data: data.initializer.format?.tool === "prettier"
+    ? getVscodeSettingsForPrettier()
+    : vscodeSettings,
+});
+
+export const loadVscodeExtensions = (
+  data: InitCommandData,
+) => ({
+  path: devToolConfigs.vscExt.path,
+  data: data.initializer.format?.tool === "prettier"
+    ? {
+      recommendations: [
+        "astro-build.astro-vscode",
+        "esbenp.prettier-vscode",
+        "oxc.oxc-vscode",
+      ],
+    }
+    : devToolConfigs.vscExt.data,
+});
+
 const withFormatIgnorePatterns = <
   T extends { ignorePatterns?: string[] },
 >(
@@ -199,6 +223,17 @@ const withFormatIgnorePatterns = <
   ].sort(),
 });
 
+function getVscodeSettingsForPrettier(): object {
+  const { "oxc.fmt.configPath": _configPath, ...settings } = vscodeSettings;
+  return {
+    ...settings,
+    "[astro]": {
+      "editor.defaultFormatter": "esbenp.prettier-vscode",
+      "editor.formatOnSave": true,
+    },
+  };
+}
+
 /**
  * Configuration objects for various development tool setup files.
  * Contains predefined configurations for code formatting, VS Code settings, and extensions
diff --git a/packages/init/src/action/patch.ts b/packages/init/src/action/patch.ts
index 68c5b9481..0ab90f0b6 100644
--- a/packages/init/src/action/patch.ts
+++ b/packages/init/src/action/patch.ts
@@ -17,6 +17,8 @@ import {
   loadOxlintConfig,
   loadPackageJson,
   loadTsConfig,
+  loadVscodeExtensions,
+  loadVscodeSettings,
 } from "./configs.ts";
 import {
   displayFile,
@@ -162,10 +164,12 @@ const getJsons = <
         ? { "tsconfig.json": loadTsConfig(data).data }
         : {}),
       "package.json": loadPackageJson(data).data,
-      [devToolConfigs["oxfmt"].path]: loadOxfmtConfig(data).data,
+      ...(data.initializer.format?.tool !== "prettier"
+        ? { [devToolConfigs["oxfmt"].path]: loadOxfmtConfig(data).data }
+        : {}),
       [devToolConfigs["oxlint"].path]: loadOxlintConfig(data).data,
-      [devToolConfigs["vscSet"].path]: devToolConfigs["vscSet"].data,
-      [devToolConfigs["vscExt"].path]: devToolConfigs["vscExt"].data,
+      [devToolConfigs["vscSet"].path]: loadVscodeSettings(data).data,
+      [devToolConfigs["vscExt"].path]: loadVscodeExtensions(data).data,
     };
   jsonsCache.set(cacheKey, jsons);
   return jsons;
diff --git a/packages/init/src/json/deps.json b/packages/init/src/json/deps.json
index 3dd36421d..976832bcd 100644
--- a/packages/init/src/json/deps.json
+++ b/packages/init/src/json/deps.json
@@ -28,6 +28,8 @@
   "npm:openapi-types": "^12.1.3",
   "npm:oxfmt": "^0.56.0",
   "npm:oxlint": "^1.71.0",
+  "npm:prettier": "^3.8.4",
+  "npm:prettier-plugin-astro": "^0.14.1",
   "npm:solid-js": "^1.9.12",
   "npm:tsx": "^4.21.0",
   "npm:typescript": "^5.9.3",
diff --git a/packages/init/src/types.ts b/packages/init/src/types.ts
index fed712795..33406f9dd 100644
--- a/packages/init/src/types.ts
+++ b/packages/init/src/types.ts
@@ -100,6 +100,7 @@ export interface WebFrameworkInitializer {
   env?: Record<string, string>;
   /** Formatter and linter options to merge into generated tool configs. */
   format?: {
+    tool?: "oxfmt" | "prettier";
     ignorePatterns?: string[];
   };
   /** TypeScript compiler options to include in `tsconfig.json`. */
diff --git a/packages/init/src/webframeworks.test.ts b/packages/init/src/webframeworks.test.ts
index 9d2810adc..c8f6f676f 100644
--- a/packages/init/src/webframeworks.test.ts
+++ b/packages/init/src/webframeworks.test.ts
@@ -96,6 +96,7 @@ test("SolidStart template loads LogTape through middleware", async () => {
 
 test("Node.js and Bun templates use Oxfmt and Oxlint", async () => {
   for (const [webFramework, description] of Object.entries(webFrameworks)) {
+    if (webFramework === "astro") continue;
     for (const packageManager of ["npm", "bun"] as const) {
       if (!description.packageManagers.includes(packageManager)) continue;
       const initializer = await description.init({
@@ -125,3 +126,39 @@ test("Node.js and Bun templates use Oxfmt and Oxlint", async () => {
     }
   }
 });
+
+test("Astro Node.js and Bun templates use Prettier for Astro files", async () => {
+  for (const packageManager of ["npm", "bun"] as const) {
+    const initializer = await astroDescription.init({
+      projectName: "test-app",
+      dir: ".",
+      command: "init",
+      packageManager,
+      kvStore: "in-memory",
+      messageQueue: "in-process",
+      webFramework: "astro",
+      testMode: false,
+      dryRun: true,
+      allowNonEmpty: false,
+      skipInstall: false,
+    });
+
+    equal(
+      initializer.tasks?.format,
+      "prettier --plugin prettier-plugin-astro --write .",
+    );
+    equal(
+      initializer.tasks?.["format:check"],
+      "prettier --plugin prettier-plugin-astro --check .",
+    );
+    equal(initializer.tasks?.lint, "oxlint .");
+    equal(initializer.devDependencies?.["prettier"] != null, true);
+    equal(
+      initializer.devDependencies?.["prettier-plugin-astro"] != null,
+      true,
+    );
+    equal(initializer.devDependencies?.["oxfmt"], undefined);
+    equal(initializer.devDependencies?.["oxlint"] != null, true);
+    equal(initializer.format?.tool, "prettier");
+  }
+});
diff --git a/packages/init/src/webframeworks/astro.ts b/packages/init/src/webframeworks/astro.ts
index b511afd84..c25b03d0e 100644
--- a/packages/init/src/webframeworks/astro.ts
+++ b/packages/init/src/webframeworks/astro.ts
@@ -2,8 +2,21 @@ import { PACKAGE_MANAGER } from "../const.ts";
 import deps from "../json/deps.json" with { type: "json" };
 import { PACKAGE_VERSION, readTemplate } from "../lib.ts";
 import type { PackageManager, WebFrameworkDescription } from "../types.ts";
-import { defaultDenoDependencies, defaultDevDependencies } from "./const.ts";
-import { getInstruction, nodeBunDevToolTasks, pmToRt } from "./utils.ts";
+import { defaultDenoDependencies } from "./const.ts";
+import { getInstruction, pmToRt } from "./utils.ts";
+
+const astroNodeBunDevDependencies = {
+  "@fedify/lint": PACKAGE_VERSION,
+  "oxlint": deps["npm:oxlint"],
+  "prettier": deps["npm:prettier"],
+  "prettier-plugin-astro": deps["npm:prettier-plugin-astro"],
+};
+
+const astroNodeBunDevToolTasks = {
+  format: "prettier --plugin prettier-plugin-astro --write .",
+  "format:check": "prettier --plugin prettier-plugin-astro --check .",
+  lint: "oxlint .",
+} as const;
 
 const astroDescription: WebFrameworkDescription = {
   label: "Astro",
@@ -33,7 +46,7 @@ const astroDescription: WebFrameworkDescription = {
       command: Array.from(getAstroInitCommand(pm)),
       dependencies,
       devDependencies: {
-        ...defaultDevDependencies,
+        ...(pm === "deno" ? {} : astroNodeBunDevDependencies),
         ...(pm !== "deno"
           ? {
             typescript: deps["npm:typescript"],
@@ -43,6 +56,7 @@ const astroDescription: WebFrameworkDescription = {
       },
       federationFile: "src/federation.ts",
       loggingFile: "src/logging.ts",
+      format: pm === "deno" ? undefined : { tool: "prettier" },
       files: {
         "astro.config.ts": await readTemplate(
           `astro/astro.config.${pmToRt(pm)}.ts`,
@@ -93,12 +107,12 @@ const TASKS = {
     dev: "bunx --bun astro dev",
     build: "bunx --bun astro build",
     preview: "bun ./dist/server/entry.mjs",
-    ...nodeBunDevToolTasks,
+    ...astroNodeBunDevToolTasks,
   },
   "node": {
     dev: "dotenvx run -- astro dev",
     build: "dotenvx run -- astro build",
     preview: "dotenvx run -- astro preview",
-    ...nodeBunDevToolTasks,
+    ...astroNodeBunDevToolTasks,
   },
 };

From f94de59f790830e1d6fb047272cc081181a089c6 Mon Sep 17 00:00:00 2001
From: Hong Minhee <hong@minhee.org>
Date: Wed, 24 Jun 2026 13:46:35 +0900
Subject: [PATCH 13/13] Tighten init review follow-ups

The init smoke tests now skip Node.js and Bun dev tool script checks
when dependencies were not installed, which avoids treating missing
node_modules as a formatter or linter failure.

JSONC config merging now treats empty or comment-only files as empty
objects while keeping other parse errors intact.  The Astro tutorial
also reflects that generated Astro projects use Prettier for formatting
rather than an Oxfmt config file.

https://github.com/fedify-dev/fedify/pull/818#discussion_r3464543417
https://github.com/fedify-dev/fedify/pull/818#discussion_r3464543421
https://github.com/fedify-dev/fedify/pull/818#discussion_r3464560678

Assisted-by: Codex:gpt-5.5
---
 docs/tutorial/astro-blog.md            |  3 +--
 packages/init/src/action/patch.test.ts | 16 +++++++++++++++-
 packages/init/src/action/patch.ts      |  5 +++++
 packages/init/src/test/create.ts       | 11 ++++++++++-
 4 files changed, 31 insertions(+), 4 deletions(-)

diff --git a/docs/tutorial/astro-blog.md b/docs/tutorial/astro-blog.md
index 832daf37a..e99a1e88f 100644
--- a/docs/tutorial/astro-blog.md
+++ b/docs/tutorial/astro-blog.md
@@ -198,9 +198,8 @@ After a moment, you'll have a working project with the following structure:
      -  *middleware.ts* — Connects Fedify to Astro's request pipeline
  -  *public/* — Files served as-is (favicon, etc.)
  -  *astro.config.ts* — Astro configuration
- -  *.oxfmtrc.json* — Code formatter settings
  -  *.oxlintrc.json* — Code linter settings
- -  *package.json* — Package metadata and scripts
+ -  *package.json* — Package metadata, scripts, and Prettier formatter setup
  -  *tsconfig.json* — TypeScript settings
 
 Because we're using TypeScript instead of plain JavaScript, source files have
diff --git a/packages/init/src/action/patch.test.ts b/packages/init/src/action/patch.test.ts
index 3c6c7d4a2..ec50897f1 100644
--- a/packages/init/src/action/patch.test.ts
+++ b/packages/init/src/action/patch.test.ts
@@ -1,5 +1,5 @@
 import assert from "node:assert/strict";
-import { mkdir, mkdtemp, rm, writeFile } from "node:fs/promises";
+import { mkdir, mkdtemp, readFile, rm, writeFile } from "node:fs/promises";
 import { tmpdir } from "node:os";
 import { join } from "node:path";
 import test from "node:test";
@@ -9,6 +9,7 @@ import {
   assertNoGeneratedFileConflicts,
   GeneratedFileConflictError,
   getJsonsCacheKey,
+  patchFiles,
 } from "./patch.ts";
 
 test("assertNoGeneratedFileConflicts allows unrelated files", async () => {
@@ -61,6 +62,19 @@ test("getJsonsCacheKey stays stable across pipeline clones", () => {
   assert.equal(getJsonsCacheKey(cloned), getJsonsCacheKey(data));
 });
 
+test("patchFiles merges JSONC files containing only comments", async () => {
+  await withTempDir(async (dir) => {
+    await writeFile(join(dir, "package.json"), "// generated scaffold\n");
+
+    await patchFiles(createInitData(dir, false));
+
+    const packageJson = JSON.parse(
+      await readFile(join(dir, "package.json"), "utf8"),
+    ) as { type?: string };
+    assert.equal(packageJson.type, "module");
+  });
+});
+
 function createInitData(
   dir: string,
   allowNonEmpty: boolean,
diff --git a/packages/init/src/action/patch.ts b/packages/init/src/action/patch.ts
index 0ab90f0b6..7fa1e5ae2 100644
--- a/packages/init/src/action/patch.ts
+++ b/packages/init/src/action/patch.ts
@@ -327,6 +327,7 @@ const parseJsoncObject = (
 ): Record<PropertyKey, unknown> => {
   const errors: ParseError[] = [];
   const value = parseJsonc(jsonString, errors, { allowTrailingComma: true });
+  if (value === undefined && isEmptyJsonc(errors)) return {};
   if (errors.length > 0) {
     throw new SyntaxError(
       errors
@@ -342,6 +343,10 @@ const parseJsoncObject = (
   return value as Record<PropertyKey, unknown>;
 };
 
+const isEmptyJsonc = (errors: readonly ParseError[]): boolean =>
+  errors.length > 0 &&
+  errors.every(({ error }) => printParseErrorCode(error) === "ValueExpected");
+
 /**
  * Appends new text content to existing text content line by line.
  * Concatenates new content lines with existing content lines,
diff --git a/packages/init/src/test/create.ts b/packages/init/src/test/create.ts
index e63498ce8..da693b679 100644
--- a/packages/init/src/test/create.ts
+++ b/packages/init/src/test/create.ts
@@ -1,7 +1,7 @@
 import $ from "@david/dax";
 import { filter, isEmpty, pipe, toArray } from "@fxts/core";
 import { values } from "@optique/core";
-import { appendFile, mkdir } from "node:fs/promises";
+import { appendFile, mkdir, stat } from "node:fs/promises";
 import { join, sep } from "node:path";
 import process from "node:process";
 import packageManagers from "../json/pm.json" with { type: "json" };
@@ -130,6 +130,7 @@ async function validateDevToolScripts(
     MessageQueue,
   ];
   if (packageManager === "deno") return true;
+  if (!(await hasInstalledNodeDependencies(dir))) return true;
 
   for (const script of ["format:check", "lint"]) {
     const result = await $`${[packageManager, "run", script]}`
@@ -145,6 +146,14 @@ async function validateDevToolScripts(
   return true;
 }
 
+async function hasInstalledNodeDependencies(dir: string): Promise<boolean> {
+  try {
+    return (await stat(join(dir, "node_modules"))).isDirectory();
+  } catch {
+    return false;
+  }
+}
+
 export function filterOptions(
   options: GeneratedType<ReturnType<typeof generateTestCases>>,
 ): boolean {