NextItem // here we know nextItem is a number Luckily, it is usually fairly easy to figure out a type given the surrounding code context.įor a variable or property, the type is typically the type of the value used to initialize it or the most recent value assignment. In JavaScript, most of the time there is no explicit type information available. Automatic acquisition of type definitions.IntelliSense based on TypeScript declaration files. TypeScript uses several sources to build up this information: This new information is provided by the TypeScript language service, which uses static analysis behind the scenes to better understand your code. Starting in Visual Studio 2017, JavaScript IntelliSense displays a lot more information on parameter and member lists. What's new in the JavaScript language service in Visual Studio 2017 See the VS Code docs for more info.įor more information about the general IntelliSense functionality of Visual Studio, see Using IntelliSense. The new editing experience also mostly applies to Visual Studio Code. Details are included in this article, and you can also read this blog post. Starting in Visual Studio 2017, the JavaScript language service uses a new engine for the language service (called "Salsa").
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