It is possible to access Rails config (for example secrets) from within your webpack bundles, thanks to rails-erb-loader Show archive.org snapshot . When using webpacker, the setup is like this:

1. Install rails-erb-loader:

   yarn add rails-erb-loader
   

2. Add this to your config/webpacker/environment.js:

   environment.loaders.prepend('erb', {
     test: /\.erb$/,
     enforce: 'pre',
     use: [{
       loader: 'rails-erb-loader',
     }]
   })
   

3. Start using erb. For example, in a file api_config.js.erb:

   /* rails-erb-loader-dependencies ../config/secrets.yml */
   
   export default {
     apiKey: '<%= Rails.application.secrets[:api][:key] %>'
   }
   

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This works by simply calling bin/rails runner with the correct environment. The rails-erb-loader-dependencies comment is only needed to make the webpack-dev-server automatically regenerate the file, when your secrets.yml changes.