typescript-pro

Generics let you parameterize types so functions and classes work across multiple type shapes, while conditional types select a type based on a condition using the extends keyword. This Skill guides you in combining them with mapped types and constraints for reusable, type-safe abstractions.

Enable strict mode along with flags like noImplicitAny, strictNullChecks, and noUncheckedIndexedAccess in your tsconfig.json. This Skill recommends compiler options and incremental compilation settings that balance safety with build performance.

Yes, the Skill covers typed patterns for React components, Node.js services, and Express APIs, including typed error boundaries and interface design. It also addresses module systems and namespace organization for these frameworks.

Prefer inference when the compiler can clearly derive the type, such as initialized variables and return values of well-typed functions. Use explicit annotations for public API boundaries, complex generics, and cases where inference produces overly wide types.

Strict mode may not fit when migrating large legacy JavaScript codebases incrementally or when the build pipeline cannot enforce TypeScript. In those cases, a gradual typing approach with relaxed flags is more practical.