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TypeScript can use JSdoc annotations: https://github.com/Microsoft/TypeScript/wiki/JsDoc-support-in-JavaScript https://github.com/Microsoft/TypeScript/wiki/JsDo

• danmaz74 9y ago
  Thanks, but from a bit of research it's not clear to me: does this mean that it's possible to use TypeScript to type-check javascript files which include these annotations, without using .ts at all?
  • moogly 9y ago
    Yes, by using --allowJS and --checkJS switches (can also be set in tsconfig.json).
    • danmaz74 9y ago
      Thanks a lot - will try this!