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The steps are essentially:
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1) Install required packages
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npm install --no-save mdn-polyfills url-polyfill regenerator-runtime core-js-bundle
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2) Join them all together:
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cd node_modules/mdn-polyfills
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cat CustomEvent.* Element.* Function.* HTMLCanvasElement.* MouseEvent.* Node.prototype.* NodeList.* > ../../lib/polyfills/polyfill.js
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cd ../url-polyfill/
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cat url-polyfill.min.js >> ../../lib/polyfills/polyfill.js
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cd ../regenerator-runtime
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cat runtime.js >> ../../lib/polyfills/polyfill.js
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cd ../core-js-bundle
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cat minified.js >> ../../lib/polyfills/polyfill.js
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sed -i '/\/\/\# sourceMappingURL=minified.js.map/d' ../../lib/polyfills/polyfill.js
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3) Uninstall the packages again
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npm uninstall --no-save mdn-polyfills url-polyfill regenerator-runtime core-js-bundle
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