Searching For the most part, type declaration packages should always have the same name as the package name on npm, but prefixed with @types/, but if you need, you can check out https://aka.ms/types to find the package for your favorite library. Note: if the declaration file you are searching for is not present, you can always contribute one back and help out the next developer looking for it. Please see the DefinitelyTyped contribution guidelines page for details.

Update tsconfig.json Now that Angular 2 and its dependencies are installed, we need to enable TypeScript’s experimental support for decorators and include the es6-shim typings. In the future decorators and ES6 will be the default and these settings will not be needed. Add "experimentalDecorators": true, "emitDecoratorMetadata": true to the "compilerOptions" section, and add "./typings/index.d.ts" to the "files" section. Finally, we need to add a new entry in "files" for another file, "./src/mod

Write some code

Write some code Let’s write our first TypeScript file using Knockout. First, create a new file in your src directory named hello.ts. import * as ko from "knockout"; class HelloViewModel { language: KnockoutObservable<string> framework: KnockoutObservable<string> constructor(language: string, framework: string) { this.language = ko.observable(language); this.framework = ko.observable(framework); } } ko.applyBindings(new HelloViewModel("TypeScript", "Knockout")); N

Write an HTML page

Write an HTML page Add a New Item named index.html inside wwwroot. Use the following code for index.html: <!DOCTYPE html> <html> <head> <meta charset="utf-8" /> <script src="scripts/app.js"></script> <title></title> </head> <body> <div id="message"></div> <div> Compiler: <input id="compiler" value="TypeScript" onkeyup="document.getElementById('message').innerText = sayHello()" /><br /> Fr

TypeScript 2.0

Null- and undefined-aware types TypeScript has two special types, Null and Undefined, that have the values null and undefined respectively. Previously it was not possible to explicitly name these types, but null and undefined may now be used as type names regardless of type checking mode. The type checker previously considered null and undefined assignable to anything. Effectively, null and undefined were valid values of every type and it wasn’t possible to specifically exclude them (and theref

search

Symbol.search A regular expression method that returns the index within a string that matches the regular expression. Called by the String.prototype.search method.

webpack

Add TypeScript

Add TypeScript The next step is to add a folder for TypeScript. We’ll just call it src.

Add example code

Add example code Type the following code into app.ts. function sayHello() { const compiler = (document.getElementById("compiler") as HTMLInputElement).value; const framework = (document.getElementById("framework") as HTMLInputElement).value; return `Hello from ${compiler} and ${framework}!`; }

Definition File Theory: A Deep Dive

Definition File Theory: A Deep Dive Structuring modules to give the exact API shape you want can be tricky. For example, we might want a module that can be invoked with or without new to produce different types, has a variety of named types exposed in a hierarchy, and has some properties on the module object as well. By reading this guide, you’ll have the tools to write complex definition files that expose a friendly API surface. This guide focuses on module (or UMD) libraries because the optio