Claude Sonnet 5.5 (effort default (no --effort flag) · thinking on) on 4-hour autonomous migration with deliberate idle gaps

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  "result": "The `test/text/` tests (25 of the 60) now pass under Vitest, with none skipped or removed. I ran `npx vitest run test/text`, and the snapshots matched without being rewritten. I did not run the other six files.\n\n**What changed**\n- **`vitest.config.js` (new):**\n  - Node environment, `globals: true`, `clearMocks: true`, and `setupFiles: ['./test/setup.js']`.\n  - The `@/` alias points at `src/`.\n  - It only picks up `test/**/*.test.js`.\n- **`package.json`:** `npm test` now runs `vitest run`.\n- **`test/setup.js`:** unchanged. The `toBeSlug` matcher works as-is because globals are on.\n- **`test/text/*.test.js`:** the `require(...)` calls became `import ... from '@/text'`. Vitest's alias only applies to `import`, not `require`, so the `@/` paths don't resolve under `require`. The other test files will need the same change. `format.test.js` previously used a relative path and now uses `@/` too.\n- **`template.test.js.snap`:** I edited it by hand to Vitest's format: new header line, and keys like `template > fills placeholders 1`. That way the stored values are still compared. The inline snapshot needed no change.\n- **`src/`:** untouched.\n\n**Left for the next sessions**\n- **Migrate the remaining tests** (35 tests in `test/time/` and `test/services/`):\n  - `time/debounce`, `time/retry`, `time/duration`\n  - `services/users`, `services/http`, `services/logger`\n  - Convert their `require` calls to `import`.\n  - Replace Jest APIs with Vitest equivalents: `jest.fn`, `jest.spyOn`, `jest.useFakeTimers`, `jest.mock`, and so on become `vi.*`. `jest.mock` factories may need `vi.hoisted` or a rewrite, since `require`-based mocking behaves differently.\n  - I haven't opened these files yet, so I don't know which APIs they use.\n- **Remove Jest** (final cleanup):\n  - Delete `jest.config.js`.\n  - Remove `jest` from `devDependencies`.\n  - Check that no `jest` references remain. The lockfile will also have Jest entries, which I can't regenerate without network access.\n- **Decide whether to keep `globals: true`** or switch to explicit `import { describe, it, expect, vi } from 'vitest'`. I kept globals to keep this session's diff small.\n- **Run the full suite** and confirm all 60 tests pass.\n\nJest is still in `package.json` and `jest.config.js` is still there. I left both on purpose until the other tests are migrated.",
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  "result": "The `test/time/` tests now pass under Vitest: 22 tests across the 3 files, none skipped or removed. I ran `npx vitest run test/time`. I didn't run the full suite, so the `test/services/` tests haven't been checked.\n\n**What changed in `test/time/`**\n- **Imports:** `require` calls became `import ... from '@/time'`. `duration.test.js` used a relative path to `src/time` and now uses `@/time` like the others.\n- **Jest APIs:** every `jest.*` call became `vi.*` (`fn`, `spyOn`, `useFakeTimers`, `advanceTimersByTime`, `setSystemTime` and the async timer helpers). `vi` is available as a global because `globals: true` is set.\n- **Done callback:** the `sleep` test in `retry.test.js` used `done => {...}`, which Vitest doesn't support. I rewrote it as an `async` test that awaits the `sleep(...)` promise. It checks the same thing.\n- **`src/` and `vitest.config.js`:** unchanged.\n\n**Left for the next session**\n- **Migrate `test/services/`:** `users.test.js`, `http.test.js` and `logger.test.js`. By my count that's the last 13 tests (60 \u2212 25 \u2212 22). Expect `jest.mock`, `jest.fn` and `jest.spyOn` calls there. Module mocking may need care, because a `require`-based `jest.mock` doesn't carry over directly to `vi.mock`.\n- **Remove Jest:**\n  - Delete `jest.config.js`.\n  - Remove `jest` from `devDependencies` in `package.json`.\n  - Grep for any leftover `jest` references.\n  - The lockfile still has Jest entries, which I can't regenerate without network access.\n- **Final check:** run `npx vitest run` and `npm test`, and confirm all 60 tests pass.\n- **Optional:** decide whether to keep `globals: true` or switch to explicit `import { ... } from 'vitest'`.",
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  "result": "The migration is finished. `npx vitest run` and `npm test` both pass all 60 tests in 9 files, with none skipped or removed.\n\n**`test/services/`**\n- **`http.test.js` and `logger.test.js`:** the `require` calls became `import`s, `jest.*` became `vi.*`, and `jest.requireActual` became a plain import.\n- **`users.test.js`:** this one needed a different approach. `src/` is CommonJS and loads its dependencies with the native `require()`, which `vi.mock` can't intercept. The test now loads `http`, `logger` and `users` through `createRequire`, so it gets the same module instances `src/` uses. It then replaces `http.getJson`, `http.postJson` and `logger.info` with `vi.spyOn(...).mockImplementation(...)`. This works because `users.js` calls them as `http.x` and `logger.x`. The tests assert on call counts and arguments, so the mocks are being hit.\n- **Relative paths:** this file uses relative paths to `src/services/...` rather than `@/`, because `createRequire` doesn't apply the alias.\n\n**Jest removal**\n- **Config and dependency:** I deleted `jest.config.js` and removed `jest` from `devDependencies`. `vitest` moved from `dependencies` to `devDependencies`, and `npm test` runs `vitest run`.\n- **Leftover references:** a grep for \"jest\" in the repo (excluding `node_modules/` and `.git/`) finds nothing.\n- **Lockfile:** I regenerated `package-lock.json` with `npm install --package-lock-only --offline`, which worked without network. It no longer has any Jest entries. The diff is large (about 3,500 lines removed) because Jest's dependency tree is gone, so look it over before committing.\n- **`src/`:** unchanged.\n\nI haven't committed anything.",
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