typescript-type-system

Strict mode enforces rigorous type checking by setting `strict: true` in tsconfig.json, which enables all strict type-checking compiler options. This prevents implicit any types, null/undefined errors, and unsafe property access, making your code safer by default.

Generics let you write flexible, reusable types and functions that work with multiple data types. Define a generic with angle brackets like `<T>`, then use it across functions, interfaces, and classes to maintain type safety while avoiding code duplication.

Type guards are conditional checks that narrow variable types within a code block, enabling the compiler to infer more specific types. Use `typeof`, `instanceof`, or custom guard functions to safely access properties without type errors.

Key compiler options include `strict`, `noImplicitAny`, `strictNullChecks`, and `strictFunctionTypes` in tsconfig.json. These options control type inference, null/undefined handling, and function parameter checking to enforce comprehensive type safety.

Yes. Union types (`Type1 | Type2`) represent multiple possible types, while intersection types (`Type1 & Type2`) combine multiple types into one. Both enable precise modeling of complex data structures with full type safety.

Set `declaration: true`, `declarationMap: true`, and `sourceMap: true` in tsconfig.json to generate type declarations and source maps. Configure `module` and `moduleResolution` to ensure safe interop with your module system and dependencies.