JavaScript and TypeScript

Follow the repository's runtime, package manager, lockfile, module system, framework, compiler, and browser support. Inspect configuration and CI before changing dependencies or syntax.

Workflow

1. Read local instructions and identify the runtime boundary.
2. Reproduce the behavior with the existing package manager and scripts.
3. Trace types and data from untrusted input to side effects.
4. Implement the smallest coherent change without mixing unrelated dependency or formatting churn.
5. Run configured typecheck, lint, tests, and build.
6. Check bundle/runtime compatibility, accessibility, security, and cleanup.

Use repository scripts rather than assuming command names: