tmu
49a78f3683
The same facts were restated in up to three files, and the restatements had already drifted: two claimed timings were 2-5x off, and the maintain rationale existed in four copies with different numbers each. Duplicated prose is a liability, not redundancy. Each fact now has exactly one owner, with links from the others: - tool inventory: README § Tooling - configuration rationale: README § Tooling decisions - prefix taxonomy: CONTRIBUTING § Script prefix convention - what runs when and at what cost: CONTRIBUTING § Feedback tiers - publish procedure: CONTRIBUTING § Publishing workflow README loses its whole Script prefix convention section and the Workflows section; CONTRIBUTING loses the Why-these-splits bullets that repeated the tier table and the rules list. Prose is 23KB to 17KB, with no rule or rationale dropped.
43 lines
3.8 KiB
Markdown
43 lines
3.8 KiB
Markdown
# AGENTS.md
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Machine entry point for AI coding agents working in this repo. The authoritative
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guidance for humans lives in [CONTRIBUTING.md](./CONTRIBUTING.md) and
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[README.md](./README.md); this file only points at it and states the stable
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first-action facts. Do not restate evolving prose here — it will drift.
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## First action
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- Project: F#-style pattern matching for TypeScript/ESM. Node `>=26` (pinned via `.node-version`), ESM-only (no CommonJS shim).
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- **While iterating:** `npm run test` (`check:tsc` + the unit suite) for fast feedback on the files you changed.
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- **Definition of done — run this before you call the work finished:** `npm run verify`. If all green, commit. If red, look at the output, fix the root cause, and re-run.
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- **On commit:** write a good message (see [CONTRIBUTING.md § Commit messages](./CONTRIBUTING.md#commit-messages)). Lefthook's pre-commit hook already runs the fast, offline, staged-file checks — don't run them by hand. If the hook fails on style, `npm run fix`, restage, recommit.
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- **`npm run maintain` is NOT part of the feature loop.** Its scans are advisory, never a gate; run them only on an explicit maintenance / update-deps branch.
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```sh
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npm run test # while iterating (fast feedback)
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npm run verify # definition of done: whole-project correctness, one shot
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```
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## Never do
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Don't silence the type system to force a green run. As an agent these are forbidden:
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- `// @ts-nocheck`, `// @ts-ignore`, `// @ts-expect-error`
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- `// oxlint-disable` / `// oxlint-disable-next-line`
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- `as` casts used to push an expression through (type-aware oxlint already flags unsafe assertions)
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Fix the root cause with the type system instead — narrowing, generics, `satisfies`, conditional / mapped types, utility types (`NonNullable`, `Exclude`, …). TypeScript can express it; that's the intended tool. The `oxlint-disable`-location rule in [CONTRIBUTING.md § Rules the tools don't enforce](./CONTRIBUTING.md#rules-the-tools-dont-enforce) is a **human** last-resort convention (so a reviewer can spot a deliberate suppression) — it is not permission for you to add one. If the types genuinely cannot express something, stop and surface the conflict (commit message / MR) rather than suppress it.
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The same applies to the checks themselves: **never `git commit --no-verify`** (or otherwise skip a pre-commit / pre-push hook). The checks are fast and offline, so a redundant run is fine — bypassing a hook to get green is the identical anti-pattern. If a commit already skipped a hook, redo it through one: `git reset --soft HEAD~1 && git commit -C <skipped-sha>`.
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Never start a long-lived / blocking process such as `npm run watch`. It runs until a human stops it with Ctrl-C, so in an agent turn it hangs forever and floods the context with continuous output. Reach for a one-shot command instead — `npm run test` (or `npm run check`) — to get feedback.
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## Read these
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- [CONTRIBUTING.md § Rules the tools don't enforce](./CONTRIBUTING.md#rules-the-tools-dont-enforce) — the constraints the linters don't catch; CI/review bounce these. **The most important section.**
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- [CONTRIBUTING.md § Script prefix convention](./CONTRIBUTING.md#script-prefix-convention) — adding an `npm run` script? reuse an existing prefix or it doesn't belong.
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- [CONTRIBUTING.md § Commit messages](./CONTRIBUTING.md#commit-messages) — gitmoji + imperative + 50/72.
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- [CONTRIBUTING.md § Feedback tiers](./CONTRIBUTING.md#feedback-tiers) — what runs when and at what cost (`watch` / pre-commit / pre-push / `check` / `verify` / `fix` / `maintain` / CI).
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- [README.md § Tooling decisions](./README.md#tooling-decisions) — the rationale behind each tool choice; read before changing tooling.
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- [package.json `#scripts`](./package.json) — the source of truth for every command (the `LEFTHOOK_FILES` convention scopes them to staged files vs. the whole project).
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