Coder Extension Development Guidelines

Build and Test Commands

Build: yarn build
Watch mode: yarn watch
Package: yarn package
Lint: yarn lint
Lint with auto-fix: yarn lint:fix
Run all tests: yarn test:ci (always use CI mode for reliable results, runs all test files automatically)
Watch mode (development only): yarn test
Run tests with coverage: yarn test:coverage
View coverage in browser: yarn test:coverage:ui

TypeScript with strict typing
No semicolons (see .prettierrc)
Trailing commas for all multi-line lists
120 character line width
Use ES6 features (arrow functions, destructuring, etc.)
Use const by default; let only when necessary
Prefix unused variables with underscore (e.g., _unused)
Sort imports alphabetically in groups: external → parent → sibling
Error handling: wrap and type errors appropriately
Use async/await for promises, avoid explicit Promise construction where possible
Test files must be named *.test.ts and use Vitest