Typescript Definition Patterns | Typescript Tutorial | Tutorial 2021 | typescript

Typescript Definition Patterns | Typescript Tutorial | Tutorial 2021 | typescript | Applying Advanced TypeScript Definition Patterns

TypeScript is a programming language developed and maintained by Microsoft. It is a strict syntactical superset of JavaScript and adds optional static typing to the language. TypeScript is designed for the development of large applications and transcompiles to JavaScript.

Built-in Type Definitions

TypeScript includes declaration files for all of the standardized built-in APIs available in JavaScript runtimes. This includes things like methods and properties of built-in types like string or function, top-level names like Math and Object, and their associated types. By default, TypeScript also includes types for things available when running inside the browser, such as window and document; these are collectively referred to as the DOM APIs.

External Definitions

For non-built-in APIs, there are a variety of ways you can get declaration files. How you do this depends on exactly which library you’re getting types for.

Speaker: Ethan Arrowood

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