Create React App does not lint TypeScript

[kumar303]

For some reason, linting is broken. I cannot get yarn react-scripts-start to show lint output.

Here's an example of how it should work. I followed these steps:

• npx create-react-app lint
• cd lint
• yarn start
• I added const unsuedVar = 2 to the top of render() in App.js

Now I see this in the console:

If I try to trigger the same lint error in addons-code-manager, I do not see the lint error. Instead I see Compiled successfully.

[bobsilverberg]

Is this because we're using ESLint instead of TSLint?

[bobsilverberg]

Scratch that - this is an ESLint error.

[kumar303]

I'm digging into it right now. So far, adding typescript to CRA seems to kill the linting features so I'm trying to figure out why.

[kumar303]

Ah, ok, linting was never supported for TypeScript. I illustrated the problem here: facebook/create-react-app#5641 (comment)

[willdurand]

This will be fixed by #633

[willdurand]

Fixed.

[AlexandraMoga]

Could you also add a qa:not needed label to this?
Thanks you