TypeScript syntax within a JS file - is it possible?

Question

I've installed some third party library for React: react-draft-wysiwyg

While exploring the source code, i was surprised to see that my Visual Studio Code IDE gives me alot of syntax errors, within the JS files. For example, this function:

onEditorBlur: Function = (): void => {
this.setState({
  editorFocused: false
});
};

My editor tells me that "types can only be used in a TS file".

The package.json "main" filed points to an already bundled file, but when i try to switch it to the src folder, i get various errors, like "you need a special loader..."

Is there some way to use typescript within JS?

Ah yes, i see in the package.json various things related to Flow, including a special Babel plugin — i.brod
– i.brod, Commented May 13, 2018 at 4:43
Solutions to your problem may be available by telling vscode to treat .J's files as another type — Burt_Harris
– Burt_Harris, Commented May 13, 2018 at 5:41

basarat · Accepted Answer · 2018-05-14 00:38:25Z

1

Is there some way to use typescript within JS?

No. But you can (and this project does) use flow: https://flow.org/

To use Flow with VSCode : https://github.com/flowtype/flow-for-vscode

answered May 14, 2018 at 0:38

basarat

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