Add new dummy webpacker3 app

Author: BookOfGreg

test/dummy_webpacker3/.babelrc

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+{
+  "presets": [
+    [
+      "env",
+      {
+        "modules": false,
+        "targets": {
+          "browsers": "> 1%",
+          "uglify": true
+        },
+        "useBuiltIns": true
+      }
+    ],
+    "react"
+  ]
+}

test/dummy_webpacker3/.postcssrc.yml

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+plugins:
+  postcss-smart-import: {}
+  precss: {}
+  autoprefixer: {}

test/dummy_webpacker3/README.rdoc

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+== README
+
+This README would normally document whatever steps are necessary to get the
+application up and running.
+
+Things you may want to cover:
+
+* Ruby version
+
+* System dependencies
+
+* Configuration
+
+* Database creation
+
+* Database initialization
+
+* How to run the test suite
+
+* Services (job queues, cache servers, search engines, etc.)
+
+* Deployment instructions
+
+* ...
+
+
+Please feel free to use a different markup language if you do not plan to run
+<tt>rake doc:app</tt>.

test/dummy_webpacker3/Rakefile

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+# Add your own tasks in files placed in lib/tasks ending in .rake,
+# for example lib/tasks/capistrano.rake, and they will automatically be available to Rake.
+
+require File.expand_path('../config/application', __FILE__)
+
+Dummy::Application.load_tasks

test/dummy_webpacker3/app/assets/config/manifest.js

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+// Sprockets 4 expects this file
+//
+//= link application.js
+//= link turbolinks_only.js
+//= link application.css

test/dummy_webpacker3/app/assets/images/.keep

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+// This is a manifest file that'll be compiled into application.js, which will include all the files
+// listed below.
+//
+// Any JavaScript/Coffee file within this directory, lib/assets/javascripts, vendor/assets/javascripts,
+// or vendor/assets/javascripts of plugins, if any, can be referenced here using a relative path.
+//
+// It's not advisable to add code directly here, but if you do, it'll appear at the bottom of the
+// compiled file.
+//
+// Read Sprockets README (https://github.com/sstephenson/sprockets#sprockets-directives) for details
+// about supported directives.
+//
+//
+// es5-shim is necessary for PhantomJS to pass tests. See https://github.com/facebook/react/issues/303
+//
+//= require turbolinks
+//= require es5-shim/es5-shim
+//= require react
+//= require react_ujs
+//= require_tree ./components
+//= require ./pages

test/dummy_webpacker3/app/assets/javascripts/application.js

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+//= require_self
+//= require_tree ./components
+//= require ./pages

test/dummy_webpacker3/app/assets/javascripts/components.js

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+var Todo = React.createClass({
+  render: function() {
+    return React.createElement("li", null, this.props.todo)
+  }
+})

test/dummy_webpacker3/app/assets/javascripts/components/PlainJSTodo.js

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+Todo = React.createClass
+  render: ->
+    `<li>{this.props.todo}</li>`
+
+# Because Coffee files are in an anonymous function,
+# expose it for server rendering tests
+this.Todo = Todo