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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.