For more details about how IntelliSense information is acquired, see JavaScript IntelliSense. For most common JavaScript libraries, d.ts files are automatically acquired. To provide IntelliSense information, the language service can use TypeScript d.ts files and JSDoc comments. IntelliSense can also show you information about types when you hover over programming elements. If you put your cursor after the data string in the following code and type get, IntelliSense will show you functions defined earlier in the code or defined in a third-party library that you've added to your project. You can also use IntelliSense to complete a word after you type enough characters to disambiguate it. In the following code, when you type Router(), you see the argument types that you can pass. It can show you information about available members of a type, or parameter details for different overloads of a method. IntelliSense is an invaluable resource when you're coding. The new file gets added to your project and it opens in the editor. In the New File dialog box, under the General category, choose the file type that you want to add, such as JavaScript File, and then choose Open. With your project open in Visual Studio, right-click on a folder or your project node in Solution Explorer (right pane), and choose Add > New Item. You can use the IDE to add new files to your project. If you aren't, we suggest you look at a tutorial such as Create a Node.js and Express app first. This article assumes you're already familiar with JavaScript development. For more information in getting the language service for TypeScript, see TypeScript support. Depending on the type of app development you're doing, you may need to install the Node.js development workload with Visual Studio. If you haven't already installed Visual Studio, go to the Visual Studio downloads page to install it for free.
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