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Currently, the JavaScript language service that is shipped as a part of the preview relies on a third party library to search DefinitelyTyped for. One of the features in Salsa that we are actively working on is to improve the automatic type acquisition by the language service. For more information on this feature, check out the wiki on GitHub. d.ts file that describes the specific library.

Visual javascript download download#

This type of information is stored in TypeScript definition files, or.d.ts files, and can be consumed by Salsa to provide improved JavaScript IntelliSense.īy default, the Salsa language service will try to detect which JavaScript libraries are in use and automatically download and reference the corresponding. This provides an excellent editing experience when working with modern frameworks that utilize JSX such as React.īecause the core of the new language service is also used to power TypeScript, JavaScript editing in Visual Studio can now benefit from the rich type information that the TypeScript community has created for popular JavaScript libraries and frameworks. Salsa adds rich support for the JSX syntax including colorizing and completions inside JSX elements. Imports in other files are resolved and IntelliSense is provided. Salsa understands the ES6 and commonjs module formats (both top user voice requests) and can provide IntelliSense across modules.Īssuming the file math-util.js exists: /**

New features provided by Salsa ES6 and commonjs modules 'UseTypeScriptExperimental'=dword:00000001 (Do the same with value 00000000 instead of 00000001 to disable at any point).

Visual javascript download update#

To enable Salsa in Visual Studio “15” Preview, save the below snippet as a local file named salsa.reg, run it to update the registry, and then restart Visual Studio. Salsa is not enabled by default because it is a preview, but please try it out and let us know what you think. Enabling Salsa in Visual Studio “15” Preview

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Finally, we can be more agile and add new features more often by unifying our code bases. Third, JavaScript inherits support for features from ES2015, ES2016 and beyond that currently exist in TypeScript. Second, JavaScript editing experiences can benefit from existing TypeScript definition to provide richer IntelliSense. First, static analysis provides a consistent experience for JavaScript across all Visual Studio setups by eliminating runtime bailouts. By basing the new language service on static analysis we hope to accomplish a number of goals. Salsa is powered by the same static analysis that provides type inference in TypeScript. In these scenarios, the language service was unable to provide any IntelliSense support. For example, the execution engine is subject to timeouts from long running code such as nested loops and http requests. The execution engine was great for handling the more dynamic aspects of the language, however, it also introduced significant complexity and inconsistency. Essentially, as you typed, a JavaScript engine constantly executed your code to provide “runtime-like” accuracy in completion lists, signature help, and other tooling features.

Until now, JavaScript editing in Visual Studio used an execution model for the language service.

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Salsa delivers many improvements over the existing JavaScript language service such as improved module support, full ES6/ES7 syntax coverage, and JSX support. Language services are responsible for providing syntax highlighting, completion lists, signature help, and other tooling features for a specific language inside the IDE. The new JavaScript language service, codenamed “Salsa”, is now available in Visual Studio “15” Preview.