Luckily, it is usually fairly easy to deduce 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. 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. JavaScript IntelliSense in Visual Studio 2017 will now display a lot more information on parameter and member lists. Automatic acquisition of type definitions.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 in VS Code. Details are included here in this topic, and you might also want to read this blog post. The JavaScript language service in Visual Studio 2017 uses a new engine for the language service (former code name 'Salsa'). Powered by a TypeScript based language service, Visual Studio delivers richer IntelliSense, support for modern JavaScript features, and improved productivity features such as Go to Definition, refactoring, and more. Visual Studio 2017 provides a powerful JavaScript editing experience right out of the box.

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