Agent-Skills.md

Agent Skills: Compiler Verify

Use when you need to run all compiler checks (tests, lint, format) before committing. Detects whether TS or Rust code changed and runs the appropriate checks.

UncategorizedID: facebook/react/compiler-verify

Repository

facebook/react
reactLicense: MIT
246,39351,188

Install this agent skill to your local

pnpm dlx add-skill https://github.com/react/react/tree/HEAD/compiler/.claude/skills/compiler-verify

Skill Files

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compiler/.claude/skills/compiler-verify/SKILL.md

Skill Metadata

Name
compiler-verify
Description
Use when you need to run all compiler checks (tests, lint, format) before committing. Detects whether TS or Rust code changed and runs the appropriate checks.

Compiler Verify

Run all verification steps for compiler changes.

Arguments:

  • $ARGUMENTS: Optional test pattern for yarn snap -p <pattern>

Instructions

  1. Detect what changed by running git diff --name-only HEAD (or vs the base branch). Categorize changes:

    • TS changes: files in compiler/packages/
    • Rust changes: files in compiler/crates/
    • Both: run all checks

  2. If TS changed, run these sequentially (stop on failure):

    • yarn snap (or yarn snap -p <pattern> if a pattern was provided) — compiler tests
    • yarn test — test full compiler
    • yarn workspace babel-plugin-react-compiler lint — lint compiler source

  3. If Rust changed, run these sequentially (stop on failure):

    • bash compiler/scripts/test-babel-ast.sh — Babel AST round-trip tests
    • bash compiler/scripts/test-rust-port.sh — full Rust port test suite (compares Rust vs TS compiler output across all passes; must have 0 failures — do not regress)
    • yarn snap --rust — end-to-end snap tests using the Rust compiler (compares compiled output and logger events against .expect.md fixtures; use yarn snap --rust -p <pattern> for focused checks)

  4. Always run (from the repo root):

    • yarn prettier-all — format all changed files

  5. If implementing a plan doc, check:

    • Plan doc has no unaddressed "Remaining Work" items
    • Plan doc status is updated to reflect current state

  6. Report results: list each step as passed/failed. On failure, stop and show the error with suggested fixes.

Common Mistakes

  • Running yarn snap without -p is fine for full verification, but slow. Use -p for focused checks.
  • Running prettier from compiler/ — must run from the repo root.
  • Forgetting Rust tests — if you touched .rs files, always run the round-trip test and yarn snap --rust.