Why didn't you just recommend this from the start? Seems a lot simpler than to add // @ts-check to every single JS file like you said in your original comment :P
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Oh, I didn't know that I can run typescript compiler on javascript code without modifying the existing code. Thanks, I'll give it a try.
Set allowJs to true in the tsconfig.json file to tell typescript to look at the js.
Good luck!
Why didn't you just recommend this from the start? Seems a lot simpler than to add
// @ts-checkto every single JS file like you said in your original comment :P