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Any IDE could do that for JavaScript; it has nothing to do with TypeScript.

• enobrev 7y ago
  I agree, and I've found that WebStorm (and other JetBrains software with JavaScript support) does a great job at it, although I do find TypeScript improves the experience.
• Rychard 7y ago
  How could this be done for JavaScript without any mechanism for signifying the type of object that is expected?
  • mikewhy 7y ago
    JS files can use JSDoc, which typescript handles (when you edit a JS file in VS Code, you're already secretly using typescript).
  • jamil7 7y ago
    If you're using a third party dependency that has type definitions tsserver / VSCode will pick it up regardless of whether you're writing js or ts.
    • Rapzid 7y ago
      I don't believe many understand how much tsserver is doing behind the scenes in Vscode for JS code bases.. Of course any IDE can do that, because they can use tsserver via the language server protocol haha.
      • jamil7 7y ago
        Yeah I use it with CoC in nvim and find it works as well as VSCode.
  • Roboprog 7y ago
    Type inference from analyzing data flow. Especially if you avoid making everything global.