Documentation - Introduction
The Declaration Files section is designed to teach you how to write a high-quality TypeScript Declaration File. We need to assume basic familiarity with the TypeScript language in order to get started. If you haven’t already, you should read the TypeScript Handbook to familiarize yourself with basic concepts, especially types and modules. The most common case for learning how .d.ts files work is t
TS Playground - An online editor for exploring TypeScript and JavaScript
Popular Documentation PagesEveryday TypesAll of the common types in TypeScript Creating Types from TypesTechniques to make more elegant types More on FunctionsHow to provide types to functions in JavaScript More on ObjectsHow to provide a type shape to JavaScript objects NarrowingHow TypeScript infers types based on runtime behavior Variable DeclarationsHow to create and type JavaScript variables
Documentation - Compiler Options in MSBuild
Overview When you have an MSBuild based project which utilizes TypeScript such as an ASP.NET Core project, you can configure TypeScript in two ways. Either via a tsconfig.json or via the project settings. Using a tsconfig.json We recommend using a tsconfig.json for your project when possible. To add one to an existing project, add a new item to your project which is called a “TypeScript JSON Confi
Documentation - Variable Declaration
let and const are two relatively new concepts for variable declarations in JavaScript. As we mentioned earlier, let is similar to var in some respects, but allows users to avoid some of the common “gotchas” that users run into in JavaScript. const is an augmentation of let in that it prevents re-assignment to a variable. With TypeScript being an extension of JavaScript, the language naturally supp
Documentation - Generics
A major part of software engineering is building components that not only have well-defined and consistent APIs, but are also reusable. Components that are capable of working on the data of today as well as the data of tomorrow will give you the most flexible capabilities for building up large software systems. In languages like C# and Java, one of the main tools in the toolbox for creating reusab
Documentation - Gulp
This quick start guide will teach you how to build TypeScript with gulp and then add Browserify, terser, or Watchify to the gulp pipeline. This guide also shows how to add Babel functionality using Babelify. We assume that you’re already using Node.js with npm. Minimal project Let’s start out with a new directory. We’ll name it proj for now, but you can change it to whatever you want.
Documentation - Templates
Popular Documentation PagesEveryday TypesAll of the common types in TypeScript Creating Types from TypesTechniques to make more elegant types More on FunctionsHow to provide types to functions in JavaScript More on ObjectsHow to provide a type shape to JavaScript objects NarrowingHow TypeScript infers types based on runtime behavior Variable DeclarationsHow to create and type JavaScript variables
Documentation - Do's and Don'ts
General Types Number, String, Boolean, Symbol and Object ❌ Don’t ever use the types Number, String, Boolean, Symbol, or Object These types refer to non-primitive boxed objects that are almost never used appropriately in JavaScript code.
Documentation - JSX
JSX is an embeddable XML-like syntax. It is meant to be transformed into valid JavaScript, though the semantics of that transformation are implementation-specific. JSX rose to popularity with the React framework, but has since seen other implementations as well. TypeScript supports embedding, type checking, and compiling JSX directly to JavaScript. Basic usage In order to use JSX you must do two t
JavaScript With Syntax For Types.
TypeScript is JavaScript with syntax for types.TypeScript is a strongly typed programming language that builds on JavaScript, giving you better tooling at any scale.
Documentation - tsc CLI Options
Using the CLI Running tsc locally will compile the closest project defined by a tsconfig.json, or you can compile a set of TypeScript files by passing in a glob of files you want. When input files are specified on the command line, tsconfig.json files are ignored.
Documentation - Creating Types from Types
TypeScript’s type system is very powerful because it allows expressing types in terms of other types. The simplest form of this idea is generics. Additionally, we have a wide variety of type operators available to use. It’s also possible to express types in terms of values that we already have. By combining various type operators, we can express complex operations and values in a succinct, maintai
Documentation - Everyday Types
In this chapter, we’ll cover some of the most common types of values you’ll find in JavaScript code, and explain the corresponding ways to describe those types in TypeScript. This isn’t an exhaustive list, and future chapters will describe more ways to name and use other types. Types can also appear in many more places than just type annotations. As we learn about the types themselves, we’ll also
Documentation - Decorators
NOTE This document refers to an experimental stage 2 decorators implementation. Stage 3 decorator support is available since Typescript 5.0. See: Decorators in Typescript 5.0 Introduction With the introduction of Classes in TypeScript and ES6, there now exist certain scenarios that require additional features to support annotating or modifying classes and class members. Decorators provide a way t
TS Playground - An online editor for exploring TypeScript and JavaScript
Popular Documentation PagesEveryday TypesAll of the common types in TypeScript Creating Types from TypesTechniques to make more elegant types More on FunctionsHow to provide types to functions in JavaScript More on ObjectsHow to provide a type shape to JavaScript objects NarrowingHow TypeScript infers types based on runtime behavior Variable DeclarationsHow to create and type JavaScript variables
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Documentation · TypeScript
https://www.typescriptlang.org/docs/handbook/modules.html
https://www.typescriptlang.org/docs/handbook/module-resolution.html
https://www.typescriptlang.org/docs/handbook/react-&-webpack.html
https://www.typescriptlang.org/docs/tutorial.html