Javascript file cause React (Typescript) fail to start

Question

I have a React project with Typescript. One day I create a javascript file in src/ and then my React app failed to start on localhost. Any explanation about this would be appriciated.
Evironment: Node 16.13.1
Step to reproduce:

git clone [email protected]:manaclan/fun-pms-frontend.git
cd fun-pms-frontend
git checkout vinhngo

Inside package.json remove:

"@types/react-facebook-login": "^4.1.4"
"react-facebook-login": "^4.1.1"

Then npm install and npm start will notify that localhost:3000 failed to connect. Removing src/setupProxy.js will make the server start as normal

gobsej · Accepted Answer · 2021-12-26 13:11:20Z

1

That's because JavaScript is not allowed in Typescript projects, you would need to modify your Typescript config, add the following flag to to the config file

--allowJs

Depending on the module bundler you probably also have to set the output directory for the transpiled Typescript files.

answered Dec 26, 2021 at 13:11

gobsej

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2 Comments

manaclan Over a year ago

tks for the response but can you provide some reference links about this ?

gobsej Over a year ago

Sorry here is some reference typescriptlang.org/tsconfig/allowJs.html . What exactly is the error? Maybe there is another reason, I only suggested this, because I also had some issues regarding js inside of ts project and that solved the problem.

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