Migrate assets to use Webpacker

config/webpack/development.js

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+process.env.NODE_ENV = process.env.NODE_ENV || 'development'
+
+const environment = require('./environment')
+
+module.exports = environment.toWebpackConfig()

config/webpack/environment.js

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+const { environment } = require('@rails/webpacker')
+const erb =  require('./loaders/erb')
+const webpack = require('webpack');
+
+environment.loaders.append('scss.erb', {
+  test: /\.scss\.erb$/,
+  enforce: 'pre',
+  exclude: /node_modules/,
+  use: [
+    'style-loader',
+    'postcss-loader',
+    'sass-loader',
+    'rails-erb-loader'
+  ]
+});
+
+environment.loaders.append('erb', erb);
+
+environment.config.externals = {
+  jquery: "jQuery"
+}
+
+module.exports = environment

config/webpack/loaders/erb.js

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+module.exports = {
+  test: /\.erb$/,
+  enforce: 'pre',
+  exclude: /node_modules/,
+  use: [{
+    loader: 'rails-erb-loader',
+    options: {
+      runner: (/^win/.test(process.platform) ? 'ruby ' : '') + 'bin/rails runner'
+    }
+  }]
+}

config/webpack/production.js

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+process.env.NODE_ENV = process.env.NODE_ENV || 'production'
+
+const environment = require('./environment')
+
+module.exports = environment.toWebpackConfig()

config/webpack/test.js

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+process.env.NODE_ENV = process.env.NODE_ENV || 'development'
+
+const environment = require('./environment')
+
+module.exports = environment.toWebpackConfig()