Function Parameter Bivariance
  • References/JavaScript/TypeScript/Type Compatibility

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

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Initialize the project
  • References/JavaScript/TypeScript/Tutorials

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

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<reference no-default-lib="true"/>
  • References/JavaScript/TypeScript/Triple-Slash Directives

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

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Using with export = or import
  • References/JavaScript/TypeScript/Declaration Files

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

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Create a new project
  • References/JavaScript/TypeScript/Tutorials

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

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Set up the build
  • References/JavaScript/TypeScript/Tutorials

Set up the build

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Download packages from NPM
  • References/JavaScript/TypeScript/Tutorials

Download packages from NPM Install PackageInstaller

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Early Benefits
  • References/JavaScript/TypeScript/Tutorials

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

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Array destructuring
  • References/JavaScript/TypeScript/Variable Declarations

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

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Write some code
  • References/JavaScript/TypeScript/Tutorials

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

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