Initial Webpacker setup

.browserslistrc

@@ -0,0 +1 @@
+defaults

.gitignore

@@ -37,3 +37,10 @@ desktop.ini
 /public/export
 
 /spec/examples.txt
+
+/public/packs
+/public/packs-test
+/node_modules
+/yarn-error.log
+yarn-debug.log*
+.yarn-integrity

app/javascript/packs/application.js

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+/* eslint no-console:0 */
+// This file is automatically compiled by Webpack, along with any other files
+// present in this directory. You're encouraged to place your actual application logic in
+// a relevant structure within app/javascript and only use these pack files to reference
+// that code so it'll be compiled.
+//
+// To reference this file, add <%= javascript_pack_tag 'application' %> to the appropriate
+// layout file, like app/views/layouts/application.html.erb
+
+
+// Uncomment to copy all static images under ../images to the output folder and reference
+// them with the image_pack_tag helper in views (e.g <%= image_pack_tag 'rails.png' %>)
+// or the `imagePath` JavaScript helper below.
+//
+// const images = require.context('../images', true)
+// const imagePath = (name) => images(name, true)
+
+console.log('Hello World from Webpacker')

babel.config.js

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+module.exports = function(api) {
+  var validEnv = ['development', 'test', 'production']
+  var currentEnv = api.env()
+  var isDevelopmentEnv = api.env('development')
+  var isProductionEnv = api.env('production')
+  var isTestEnv = api.env('test')
+
+  if (!validEnv.includes(currentEnv)) {
+    throw new Error(
+      'Please specify a valid `NODE_ENV` or ' +
+        '`BABEL_ENV` environment variables. Valid values are "development", ' +
+        '"test", and "production". Instead, received: ' +
+        JSON.stringify(currentEnv) +
+        '.'
+    )
+  }
+
+  return {
+    presets: [
+      isTestEnv && [
+        '@babel/preset-env',
+        {
+          targets: {
+            node: 'current'
+          }
+        }
+      ],
+      (isProductionEnv || isDevelopmentEnv) && [
+        '@babel/preset-env',
+        {
+          forceAllTransforms: true,
+          useBuiltIns: 'entry',
+          corejs: 3,
+          modules: false,
+          exclude: ['transform-typeof-symbol']
+        }
+      ]
+    ].filter(Boolean),
+    plugins: [
+      'babel-plugin-macros',
+      '@babel/plugin-syntax-dynamic-import',
+      isTestEnv && 'babel-plugin-dynamic-import-node',
+      '@babel/plugin-transform-destructuring',
+      [
+        '@babel/plugin-proposal-class-properties',
+        {
+          loose: true
+        }
+      ],
+      [
+        '@babel/plugin-proposal-object-rest-spread',
+        {
+          useBuiltIns: true
+        }
+      ],
+      [
+        '@babel/plugin-transform-runtime',
+        {
+          helpers: false
+        }
+      ],
+      [
+        '@babel/plugin-transform-regenerator',
+        {
+          async: false
+        }
+      ]
+    ].filter(Boolean)
+  }
+}

bin/webpack

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+#!/usr/bin/env ruby
+
+ENV["RAILS_ENV"] ||= ENV["RACK_ENV"] || "development"
+ENV["NODE_ENV"]  ||= "development"
+
+require "pathname"
+ENV["BUNDLE_GEMFILE"] ||= File.expand_path("../../Gemfile",
+  Pathname.new(__FILE__).realpath)
+
+require "bundler/setup"
+
+require "webpacker"
+require "webpacker/webpack_runner"
+
+APP_ROOT = File.expand_path("..", __dir__)
+Dir.chdir(APP_ROOT) do
+  Webpacker::WebpackRunner.run(ARGV)
+end

bin/webpack-dev-server

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+#!/usr/bin/env ruby
+
+ENV["RAILS_ENV"] ||= ENV["RACK_ENV"] || "development"
+ENV["NODE_ENV"]  ||= "development"
+
+require "pathname"
+ENV["BUNDLE_GEMFILE"] ||= File.expand_path("../../Gemfile",
+  Pathname.new(__FILE__).realpath)
+
+require "bundler/setup"
+
+require "webpacker"
+require "webpacker/dev_server_runner"
+
+APP_ROOT = File.expand_path("..", __dir__)
+Dir.chdir(APP_ROOT) do
+  Webpacker::DevServerRunner.run(ARGV)
+end

config/initializers/content_security_policy.rb

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+# allow webpack-dev-server host as allowed origin for connect-src
+policy.connect_src :self, :https, "http://localhost:3035", "ws://localhost:3035" if Rails.env.development?

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')
+
+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()

config/webpacker.yml

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+# Note: You must restart bin/webpack-dev-server for changes to take effect
+
+default: &default
+  source_path: app/javascript
+  source_entry_path: packs
+  public_root_path: public
+  public_output_path: packs
+  cache_path: tmp/cache/webpacker
+  webpack_compile_output: true
+
+  # Additional paths webpack should lookup modules
+  # ['app/assets', 'engine/foo/app/assets']
+  additional_paths: []
+
+  # Reload manifest.json on all requests so we reload latest compiled packs
+  cache_manifest: false
+
+  # Extract and emit a css file
+  extract_css: false
+
+  static_assets_extensions:
+    - .jpg
+    - .jpeg
+    - .png
+    - .gif
+    - .tiff
+    - .ico
+    - .svg
+    - .eot
+    - .otf
+    - .ttf
+    - .woff
+    - .woff2
+
+  extensions:
+    - .mjs
+    - .js
+    - .sass
+    - .scss
+    - .css
+    - .module.sass
+    - .module.scss
+    - .module.css
+    - .png
+    - .svg
+    - .gif
+    - .jpeg
+    - .jpg
+
+development:
+  <<: *default
+  compile: true
+
+  # Reference: https://webpack.js.org/configuration/dev-server/
+  dev_server:
+    https: false
+    host: localhost
+    port: 3035
+    public: localhost:3035
+    hmr: false
+    # Inline should be set to true if using HMR
+    inline: true
+    overlay: true
+    compress: true
+    disable_host_check: true
+    use_local_ip: false
+    quiet: false
+    pretty: false
+    headers:
+      'Access-Control-Allow-Origin': '*'
+    watch_options:
+      ignored: '**/node_modules/**'
+
+
+test:
+  <<: *default
+  compile: true
+
+  # Compile test packs to a separate directory
+  public_output_path: packs-test
+
+production:
+  <<: *default
+
+  # Production depends on precompilation of packs prior to booting for performance.
+  compile: false
+
+  # Extract and emit a css file
+  extract_css: true
+
+  # Cache manifest.json for performance
+  cache_manifest: true

package.json

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+{
+  "dependencies": {
+    "@rails/webpacker": "5.2.1"
+  },
+  "devDependencies": {
+    "webpack-dev-server": "^3.11.0"
+  }
+}

postcss.config.js

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+module.exports = {
+  plugins: [
+    require('postcss-import'),
+    require('postcss-flexbugs-fixes'),
+    require('postcss-preset-env')({
+      autoprefixer: {
+        flexbox: 'no-2009'
+      },
+      stage: 3
+    })
+  ]
+}