typescript-expert

This error comes from circular or deeply recursive types. Limit recursion depth with conditional types, replace type intersections with interfaces, and split large union types. The Skill provides a depth-limited NestedArray pattern as a concrete fix.

Enable skipLibCheck and incremental compilation, configure precise include/exclude patterns, and use project references in monorepos. Run tsc --extendedDiagnostics to measure check time, file count, and node count before and after changes.

Choose Biome when speed matters and you want one tool for linting and formatting with TypeScript-first defaults. Stay with ESLint when you need type-aware linting, custom rules, or Vue/Angular support, which Biome does not yet cover.

Module resolution failures usually come from a moduleResolution setting that mismatches your bundler, misaligned baseUrl and paths, or stale caches. Check tsconfig settings, verify workspace protocol in monorepos, and clear node_modules/.cache and .tsbuildinfo.

No, tsconfig paths only apply at compile time. For ts-node use tsconfig-paths/register, for Node ESM use loader alternatives or avoid TS paths, and for production pre-compile with resolved paths.

Enable allowJs and checkJs in tsconfig, rename files from .js to .ts gradually, add types file by file, then enable strict flags one at a time. Tools like ts-migrate and typesync can automate parts of the process.