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add log message for service worker doc #3684

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add log message for service worker doc #3684

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6 changes: 6 additions & 0 deletions packages/react-scripts/template/src/registerServiceWorker.js
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Original file line number Diff line number Diff line change
Expand Up @@ -19,6 +19,12 @@ const isLocalhost = Boolean(
);

export default function register() {
if (process.env.NODE_ENV !== 'production') {
console.log(
'This project is configured to add a service worker caching in the production build. Read more on %o',
'http://bit.ly/2vJdu84'
);
}
if (process.env.NODE_ENV === 'production' && 'serviceWorker' in navigator) {
// The URL constructor is available in all browsers that support SW.
const publicUrl = new URL(process.env.PUBLIC_URL, window.location);
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