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| How to fix “Only one instance of babel-polyfill is allowed” error ReactJS with Webpack v4 |
If the culprit is HtmlWebpackPlugin, you need to add the option
inject: false when instancing the plugin. Certain configurations without this option causes your built javascript code to be loaded twice.From: https://stackoverflow.com/questions/43902416/only-one-instance-of-babel-polyfill-is-allowed-error
