Function Parameter Bivariance When comparing the types of function parameters, assignment succeeds if either the source parameter is assignable

Initialize the project Now we’ll turn this folder into an npm package. npm

/// <reference no-default-lib="true"/> This directive marks a file as a default library. You will see this comment

Using with export = or import An important rule is that export and import declarations

Create a new project Choose File Choose New Project Choose Visual C#

Set up the build

Download packages from NPM Install PackageInstaller

Early Benefits Even at this point you can get some great benefits from TypeScript understanding your project. If you open up an editor like

Array destructuring The simplest form of destructuring is array destructuring assignment:

Write some code Let’s write our first TypeScript file using React. First, create a file named Hello.tsx in src/components