fetch not defined in Safari (ReferenceError: Can't find variable: fetch)

You can use https://github.com/github/fetch polyfill for unsupported browsers.

npm install whatwg-fetch --save;

Edit: (per the comments)

add

import 'whatwg-fetch';

in each file before using fetch – oliviergg

Use whatwg-fetch polyfill. If you use webpack, you could just add it to entry point

entry: {
  app: ['whatwg-fetch', 'your-index.js']
}

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