Editing JavaScript

.js and .jsx files use the same language service as TypeScript: completions, peek definition, rename, and quick fixes. Add // @ts-check, or "checkJs": true in jsconfig.json, and you get richer type-aware diagnostics without turning the project into TypeScript.

Automatic type acquisition

For many npm packages, Gyaanmitra can download @types/* packages in the background so hover and completion know the library's API. This uses npm on your machine. If it fails, check that npm is installed and reachable from the integrated terminal.

The settings live under JS/TS › Automatic Type Acquisition (and the older typescript.disableAutomaticTypeAcquisition aliases).

Project configuration

A jsconfig.json (or a tsconfig.json with allowJs) says which files belong to the project, sets path aliases, and tunes checking. Without one, Gyaanmitra still offers language features for the files you have open. With one, workspace symbols and cross-file refactorings are more reliable.

See also TypeScript and Node.js.