typescript-tooling
Development tools, linting, and build config for TypeScript. Use when configuring ESLint, Prettier, Jest, Vitest, tsconfig, or any TS build tooling.
What this skill does
# TypeScript Tooling ## **Priority: P1 (OPERATIONAL)** ## Implementation Guidelines - **Compiler**: Use `tsc` for CI builds; `esbuild` or `ts-node` for development. - **Linting**: Enforce `ESLint` with `@typescript-eslint/recommended`. Enable strict type checking. - **Formatting**: Mandate `Prettier` via `lint-staged` and `.prettierrc`. - **Testing**: Use `Vitest` (or `Jest`) for unit/integration testing. Target > 80% line coverage. - **Builds**: Use `tsup` (library bundling) or `Vite` (web applications). - **TypeScript Config**: Aim for `strict: true` long-term. For existing projects, migrate incrementally: start with `strictNullChecks`, then `noImplicitAny`, `strictFunctionTypes`. Do NOT flip `strict: true` in one step. - **CI/CD**: Always run `tsc --noEmit` in build pipeline to catch type errors. - **Error Suppression**: Favor `@ts-expect-error` over `@ts-ignore` for documented edge-cases. ## ESLint Configuration Enable `@typescript-eslint/recommended` at minimum. When `strict: false` in tsconfig, `no-unsafe-*` rules may produce excessive noise — suppress selectively with `@ts-expect-error` rather than disabling globally. See [reference](references/REFERENCE.md) for common linting issues (request typing, unused params, test mock typing) and tsconfig migration examples. ## Verification Workflow (Mandatory) After editing any `.ts` / `.tsx` file: 1. Call `getDiagnostics` (typescript-lsp MCP tool) — surfaces type errors in real time. 2. Run `tsc --noEmit` in CI — catches project-wide errors LSP may miss. 3. Run `eslint --fix` — auto-fix formatting and lint violations. > **Fallback when typescript-lsp MCP unconfigured**: run `tsc --noEmit` directly. `getDiagnostics` fastest feedback loop. Use it before every commit on modified files. Use `getHover` to inspect inferred types, `getReferences` before renaming symbols. ## Anti-Patterns - **No `@ts-ignore`**: Use `@ts-expect-error` — self-documents intent, fails if error disappears. - **No `any` for request objects**: Import centralized interfaces from `src/common/interfaces/`. - **No `eslint-disable` (global)**: Suppress per-line; fix root cause instead. - **No atomic `strict: true` flip** on existing repos: migrate incrementally starting with `strictNullChecks`. ## References - [Config Examples & Linting Patterns](references/REFERENCE.md)
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