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VS Code uses TypeScript type declaration (typings) files (for example node.d.ts) to provide metadata to VS Code about the JavaScript based frameworks you are consuming in your application.
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Installation
Installation:
- VsCode: VS Code will install them automatically for you (Thanks to the Automatic Type Acquisition (ATA). ATA pulls down the npm Type Declaration files (*.d.ts) for the npm modules referenced in the package.json.
- Manually
npm install --save-dev @types/d3-sankey