Jul 17, 2026· 6 min read
Ambient Declarations in TypeScript
Ambient declarations use the declare keyword to tell TypeScript about values that exist at runtime but were not written in TypeScript. Learn how and when to use them.
TypeScript
TypeScript
Type-safe JavaScript with TypeScript
187 tutorials
12 of 187 tutorials
Jul 17, 2026· 7 min read
Type Untyped Packages in TypeScript
Learn how to add TypeScript types to npm packages that ship without them. Create declaration files for untyped JavaScript libraries so you get autocomplete and type safety.
TypeScript
Jul 17, 2026· 6 min read
Install and Use @types Packages
Learn how to find, install, and use @types packages to add type definitions for JavaScript libraries in your TypeScript project.
TypeScript
Jul 17, 2026· 6 min read
DefinitelyTyped Explained for TypeScript
DefinitelyTyped is the community repository that powers @types packages. Learn what it is, how it works, and how to find and contribute type definitions.
TypeScript
Jul 17, 2026· 7 min read
Publish Type Declarations for a Package
Learn how to publish TypeScript declaration files for your npm package, whether by bundling types with your code or publishing to the @types organization.
TypeScript
Jul 17, 2026· 7 min read
Common Declaration File Mistakes
Avoid the most common mistakes when writing TypeScript declaration files. Learn the right patterns for types, callbacks, overloads, and module structure.
TypeScript
Jul 17, 2026· 7 min read
Important tsconfig Options Explained
Understand the most important tsconfig.json options: target, module, outDir, rootDir, strict, lib, sourceMap, and more. Learn what each one controls and how to choose the right values.
TypeScript
Jul 17, 2026· 6 min read
Strict Mode in TypeScript
Strict mode enables every type-safety check TypeScript offers. Learn what strict: true does, which checks it enables, and why you should use it from day one.
TypeScript
Jul 17, 2026· 5 min read
NoImplicitAny in TypeScript
noImplicitAny forces you to annotate types wherever TypeScript cannot infer them. Learn what it does, why it catches hidden bugs, and how to fix the errors it surfaces.
TypeScript
Jul 17, 2026· 5 min read
StrictNullChecks in TypeScript
strictNullChecks makes null and undefined their own distinct types. Learn how it catches the most common runtime error in JavaScript and how to handle nullable values safely.
TypeScript
Jul 17, 2026· 6 min read
Target and Lib in tsconfig
Target controls the JavaScript version TypeScript emits. Lib controls which built-in APIs are available for type-checking. Learn how they work together and how to choose the right values.
TypeScript
Jul 17, 2026· 4 min read
Incremental Builds in TypeScript
Incremental builds cache information about your project so TypeScript only rechecks what changed. Learn how to enable them and when they help speed up compilation.
TypeScript