TypeScript Testing

Use this skill to choose verification for TypeScript changes.

Read references/test-commands.md before running broad checks or adding new test coverage.

Read references/effect-v4-cli.md before writing or modifying tests under ts/packages/cli/test/ — it covers it.effect/layer(...) conventions, explicit per-service test layers (no .Default auto-generation in v4), and the @effect/platform-bun subpath-import rule.