test: migrate unit test runner from jest to vitest

.eslintrc.cjs

@@ -1,11 +1,8 @@
-const jestPackageJson = require('jest/package.json');
-
 module.exports = {
   root: true,
   env: {
     es6: true,
     node: true,
-    jest: true,
   },
   parser: '@typescript-eslint/parser',
   plugins: ['@typescript-eslint'],
@@ -22,7 +19,9 @@ module.exports = {
     'assets/**',
     'scripts/**',
     'coverage/**',
-    'e2e-tests/test-applications/**',
+    // Standalone jest-based package, linted/typechecked in its own context and
+    // outside the root tsconfig the parser uses (parserOptions.project).
+    'e2e-tests/**',
   ],
   extends: [
     'eslint:recommended',
@@ -33,16 +32,31 @@ module.exports = {
   overrides: [
     {
       files: [
-        '**/e2e-tests/utils/**/*.ts',
         '*.test.js',
         '*.test.ts',
         '**/__tests__/**/*.ts',
         '**/__tests__/**/*.js',
+        '**/__mocks__/**/*.ts',
       ],
-      plugins: ['jest'],
-      extends: ['plugin:jest/recommended', 'plugin:jest/style'],
-      env: {
-        'jest/globals': true,
+      globals: {
+        // vitest test APIs (test.globals: true) ...
+        describe: 'readonly',
+        it: 'readonly',
+        test: 'readonly',
+        expect: 'readonly',
+        suite: 'readonly',
+        beforeEach: 'readonly',
+        afterEach: 'readonly',
+        beforeAll: 'readonly',
+        afterAll: 'readonly',
+        vi: 'readonly',
+        vitest: 'readonly',
+        // ... and the ambient mock helper types from types/vitest-global-types.d.ts
+        Mock: 'readonly',
+        Mocked: 'readonly',
+        MockInstance: 'readonly',
+        MockedFunction: 'readonly',
+        MockedClass: 'readonly',
       },
       rules: {
         '@typescript-eslint/unbound-method': 'off',
@@ -55,11 +69,6 @@ module.exports = {
       },
     },
   ],
-  settings: {
-    jest: {
-      version: jestPackageJson.version,
-    },
-  },
   globals: {
     NodeJS: true,
   },

__mocks__/@posthog/warlock.ts

@@ -1,9 +1,9 @@
 // Mock for @posthog/warlock
 //
 // The real package is ESM-only and loads a YARA-X WASM binary at runtime, which
-// jest cannot transform/execute. Unit tests exercise the wizard's own decision
+// the unit test runner can't execute. Unit tests exercise the wizard's own decision
 // logic (scan_context filtering, severity/action mapping, triage handling,
-// fail-closed behavior) against these jest.fn()s — never the real engine. Rule
+// fail-closed behavior) against these vi.fn()s — never the real engine. Rule
 // matching itself is tested in the warlock repo.
 
 import type * as RealWarlock from '@posthog/warlock';
@@ -62,13 +62,13 @@ export const CATEGORIES = [
 ] as const;
 
 // Default: nothing matches. Tests override per-case with mockResolvedValueOnce.
-export const scan = jest.fn(
+export const scan = vi.fn(
   (_content: string): Promise<ScanResult> =>
     Promise.resolve({ matched: false }),
 );
 
 // Default: pass matches through as true positives (mirrors warlock's fail-safe).
-export const triageMatches = jest.fn(
+export const triageMatches = vi.fn(
   (
     _content: string,
     matches: ScanMatch[],
@@ -86,8 +86,8 @@ export const triageMatches = jest.fn(
 // ─── Compile-time drift guard ────────────────────────────────────
 // If the real package's exports change shape, this assignment stops
 // type-checking and `pnpm test` fails — so the mock can't silently diverge
-// from the engine the wizard actually ships with. It works because jest's
-// moduleNameMapper is runtime-only: the `import type` above resolves to the
+// from the engine the wizard actually ships with. It works because vitest's
+// resolve.alias is runtime-only: the `import type` above resolves to the
 // REAL package under TypeScript and is fully erased at runtime.
 // (This guard caught warlock 0.2.2 adding the required `matchedStrings`
 // field to ScanMatch.)

e2e-tests/tsconfig.json

@@ -1,3 +1,12 @@
 {
+  // e2e-tests is a standalone, jest-based package (run via `jest -c
+  // jest.config.ts`). The root tsconfig moved the unit suite to vitest and
+  // dropped jest from its `types`/scope, so this config restores jest's ambient
+  // types and re-includes the e2e sources for ts-jest.
   "extends": "../tsconfig.json",
+  "compilerOptions": {
+    "types": ["node", "jest"]
+  },
+  "include": ["**/*.ts"],
+  "exclude": ["node_modules", "test-applications/**/*"]
 }

package.json

@@ -76,6 +76,7 @@
     "@types/yargs": "^16.0.9",
     "@typescript-eslint/eslint-plugin": "^5.13.0",
     "@typescript-eslint/parser": "^5.13.0",
+    "@vitest/coverage-v8": "^3.2.4",
     "babel-jest": "^29.7.0",
     "dotenv": "^16.4.7",
     "eslint": "^8.18.0",
@@ -91,7 +92,8 @@
     "ts-node": "^10.9.1",
     "tsdown": "^0.21.9",
     "tsx": "^4.20.3",
-    "typescript": "^5.0.4"
+    "typescript": "^5.0.4",
+    "vitest": "^3.2.4"
   },
   "engines": {
     "node": "^20.20.0 || >=22.22.0",
@@ -113,61 +115,15 @@
     "fix": "pnpm fix:eslint && pnpm fix:prettier",
     "fix:prettier": "prettier --write \"{lib,src,test}/**/*.ts\"",
     "fix:eslint": "eslint . --cache --format stylish --fix",
-    "test": "pnpm build && jest",
+    "test": "pnpm build && vitest run",
+    "test:coverage": "pnpm build && vitest run --coverage",
     "test:e2e": "pnpm build && ./e2e-tests/run.sh",
     "test:e2e-record": "export RECORD_FIXTURES=true && pnpm build && ./e2e-tests/run.sh",
     "try": "tsx bin.ts",
     "dev": "pnpm build && pnpm link --global && pnpm build:watch",
-    "test:watch": "jest --watch",
+    "test:watch": "vitest",
     "prepare": "husky"
   },
-  "jest": {
-    "collectCoverage": true,
-    "coveragePathIgnorePatterns": [
-      "dist"
-    ],
-    "transform": {
-      "^.+\\.tsx?$": "ts-jest",
-      "node_modules/.+\\.js$": "babel-jest"
-    },
-    "testRegex": "(/__tests__/.*|(\\.|/)(test|spec))\\.(jsx?|tsx?)$",
-    "moduleFileExtensions": [
-      "ts",
-      "tsx",
-      "js",
-      "jsx",
-      "json"
-    ],
-    "modulePathIgnorePatterns": [
-      "<rootDir>/dist/",
-      "<rootDir>/.claude/worktrees/"
-    ],
-    "testPathIgnorePatterns": [
-      "/dist/",
-      "/node_modules/",
-      "\\.d\\.(jsx?|tsx?)$",
-      "\\.no-jest\\.(jsx?|tsx?)$",
-      "/e2e-tests/"
-    ],
-    "testEnvironment": "node",
-    "transformIgnorePatterns": [
-      "node_modules/(?!(.pnpm/nanostores|nanostores))"
-    ],
-    "moduleNameMapper": {
-      "^@anthropic-ai/claude-agent-sdk$": "<rootDir>/__mocks__/@anthropic-ai/claude-agent-sdk.ts",
-      "^@posthog/warlock$": "<rootDir>/__mocks__/@posthog/warlock.ts",
-      "^ink$": "<rootDir>/__mocks__/ink.ts",
-      "^@env$": "<rootDir>/src/env.ts",
-      "^@lib/(.*)$": "<rootDir>/src/lib/$1",
-      "^@utils/(.*)$": "<rootDir>/src/utils/$1",
-      "^@ui$": "<rootDir>/src/ui/index.ts",
-      "^@ui/(.*)$": "<rootDir>/src/ui/$1",
-      "^@steps$": "<rootDir>/src/steps/index.ts",
-      "^@steps/(.*)$": "<rootDir>/src/steps/$1",
-      "^@frameworks/(.*)$": "<rootDir>/src/frameworks/$1",
-      "^(\\.{1,2}/.*)\\.js$": "$1"
-    }
-  },
   "lint-staged": {
     ".claude/settings.json": "sh -c 'printf \"\\n\\033[31mDo not commit .claude/settings.json — use .claude/settings.local.json (gitignored).\\nUnstage with: git restore --staged .claude/settings.json\\033[0m\\n\\n\" >&2 && exit 1'",
     "*.{js,ts,tsx,jsx}": [