Add webpacker and use it for new_design

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 webpack = require('webpack');
+environment.plugins.append('Provide', new webpack.ProvidePlugin({
+  $: 'jquery',
+  jQuery: 'jquery'
+}));
+
+module.exports = environment

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()