Migrate to TypeScript

.gitignore

@@ -5,3 +5,4 @@ node_modules/
 
 dist-worker/
 .wrangler/
+types/worker.d.ts

README.md

@@ -46,12 +46,12 @@ Our full set of linting can be run at any time with:
 npm run lint
 ```
 
-Included in this repository are an [eslint config file](.eslintrc.cjs) as well as an
+Included in this repository are an [eslint config file](eslint.config.js) as well as an
 [editorconfig file](.editorconfig) to help with ensuring a consistent style in the codebase for the
 API server.
 
 To help enforce this, we use both eslint and echint in our testing. To run eslint at any time, which
-checks the code style of any JavaScript, you can use:
+checks the code style of any TypeScript, you can use:
 
 ```sh
 npm run lint:eslint
@@ -97,13 +97,6 @@ a valid DSN URL from Sentry. The `SENTRY_RELEASE` environment variable can also
 specific release of the worker (our GitHub Actions workflows for deployments set this to the current
 commit hash).
 
-Alongside the normal error reporting that Sentry provides in the worker, we also fire out custom
-error events for certain issues to help with improving data consistency across cdnjs:
-
-<!-- - `Missing SRI entry` is fired if there is no SRI hash for a file -->
-- `Bad entry in Algolia data` is fired if an entry in Algolia is falsey, or if its name is falsey
-- `Bad entry in packages data` is fired if a package is falsey, or if its `name`/`version` is falsey
-
 ## Deployment
 
 As this API server is written as a Cloudflare Worker, you can deploy it using the Wrangler CLI. This

eslint.config.js

@@ -0,0 +1,32 @@
+// @ts-check
+
+import eslint from '@eslint/js';
+import { defineConfig } from 'eslint/config';
+import tseslint from 'typescript-eslint';
+import jsdoc from 'eslint-plugin-jsdoc';
+
+export default defineConfig(
+    eslint.configs.recommended,
+    tseslint.configs.strict,
+    tseslint.configs.stylistic,
+    jsdoc.configs['flat/recommended-typescript'],
+    {
+        name: 'custom/jsdoc',
+        rules: {
+            'jsdoc/require-returns': 'off',
+            'jsdoc/tag-lines': [ 'error', 'any', { startLines: 1 } ]
+        },
+    },
+    {
+        name: 'custom/spec',
+        files: [ '**/spec/**/*.ts', '**/*.spec.ts' ],
+        rules: {
+            '@typescript-eslint/no-unused-expressions': 'off',
+            '@typescript-eslint/no-non-null-assertion': 'off',
+        }
+    },
+    {
+        name: 'custom/ignores',
+        ignores: [ 'dist-worker/**', 'types/worker.d.ts' ],
+    }
+);