import {saveAs} from ‘file-saver’: CommonJS or AMD dependencies can cause optimization bailouts

Use file-saver-es instead.

npm install -S file-saver-es

Then in your code import saveAs and other codes keep as before.

import { saveAs } from 'file-saver-es';

and if you’re using typescript add following to your tsconfig:

"paths": {
      "file-saver-es": [
        "@types/file-saver"
      ]
    }