add note about serviceWorker.js

[jeffwillette]

I followed these instructions and converted all the js files to ts and it failed to compile. Added a note about serviceWorker.js needing to be converted to ts, or left as js

[petetnt]

There's also a typed version of the serviceWorker.js available in https://github.com/facebook/create-react-app/blob/master/packages/react-scripts/template-typescript/src/serviceWorker.ts

[jeffwillette]

hmm. shouldn't the typed version be used by default if they are making a typescript app?

[petetnt]

Actually I'd say yes, it could be a follow up for #5549

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[stale]

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[stale]

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[bugzpodder]

Thanks for the PR. we have this file now.