Webpacker Server Rendering

lib/assets/javascripts/react_ujs.js

@@ -125,15 +125,16 @@ module.exports = function(ujs) {
 // Assume className is simple and can be found at top-level (window).
 // Fallback to eval to handle cases like 'My.React.ComponentName'.
 // Also, try to gracefully import Babel 6 style default exports
+var topLevel = typeof window === "undefined" ? this : window;
+
 module.exports = function(className) {
   var constructor;
-  var topLevel = typeof window === "undefined" ? this : window;
   // Try to access the class globally first
   constructor = topLevel[className];
 
   // If that didn't work, try eval
   if (!constructor) {
-    constructor = eval.call(topLevel, className);
+    constructor = eval(className);
   }
 
   // Lastly, if there is a default attribute try that
@@ -308,6 +309,12 @@ if (typeof window !== "undefined") {
   detectEvents(ReactRailsUJS)
 }
 
+// It's a bit of a no-no to populate the global namespace,
+// but we really need it!
+// We need access to this object for server rendering, and
+// we can't do a dynamic `require`, so we'll grab it from here:
+this.ReactRailsUJS = ReactRailsUJS
+
 module.exports = ReactRailsUJS
 
 

lib/react/rails/railtie.rb

@@ -20,6 +20,10 @@ class Railtie < ::Rails::Railtie
       # Changing files with these extensions in these directories will cause the server renderer to reload:
       config.react.server_renderer_directories = ["/app/assets/javascripts/"]
       config.react.server_renderer_extensions = ["jsx"]
+      if defined?(Webpacker)
+        config.react.server_renderer_directories << "app/javascript"
+        config.react.server_renderer_extensions << "js"
+      end
       # View helper implementation:
       config.react.view_helper_implementation = nil # Defaults to ComponentMount
 
@@ -30,6 +34,7 @@ class Railtie < ::Rails::Railtie
           memo[app_dir] = config.react.server_renderer_extensions
           memo
         end
+
         app.reloaders << ActiveSupport::FileUpdateChecker.new([], reload_paths) do
           React::ServerRendering.reset_pool
         end

lib/react/server_rendering/exec_js_renderer.rb

@@ -41,7 +41,7 @@ def render_from_parts(before, main, after)
 
       def main_render(component_name, props, prerender_options)
         render_function = prerender_options.fetch(:render_function, "renderToString")
-        "ReactRailsUJS.serverRender('#{render_function}', #{component_name}, #{props})"
+        "this.ReactRailsUJS.serverRender('#{render_function}', '#{component_name}', #{props})"
       end
 
       def compose_js(before, main, after)

lib/react/server_rendering/sprockets_renderer.rb

@@ -1,5 +1,6 @@
 require "react/server_rendering/environment_container"
 require "react/server_rendering/manifest_container"
+require "react/server_rendering/webpacker_manifest_container"
 require "react/server_rendering/yaml_manifest_container"
 
 module React
@@ -57,19 +58,7 @@ class << self
       #
       # @return [#find_asset(logical_path)] An object that returns asset contents by logical path
       def asset_container
-        @asset_container ||= if self.class.asset_container_class.present?
-          self.class.asset_container_class.new
-        elsif assets_precompiled? && ManifestContainer.compatible?
-          ManifestContainer.new
-        elsif assets_precompiled? && YamlManifestContainer.compatible?
-          YamlManifestContainer.new
-        else
-          EnvironmentContainer.new
-        end
-      end
-
-      def assets_precompiled?
-        !::Rails.application.config.assets.compile
+        @asset_container ||= asset_container_class.new
       end
 
       private
@@ -97,6 +86,29 @@ def render_function(opts)
       def prepare_props(props)
         props.is_a?(String) ? props : props.to_json
       end
+
+      def assets_precompiled?
+        !::Rails.application.config.assets.compile
+      end
+
+      def asset_container_class
+        if self.class.asset_container_class.present?
+          self.class.asset_container_class
+        elsif WebpackerManifestContainer.compatible?
+          WebpackerManifestContainer
+        elsif assets_precompiled?
+          if ManifestContainer.compatible?
+            ManifestContainer
+          elsif YamlManifestContainer.compatible?
+            YamlManifestContainer
+          else
+            # Even though they are precompiled, we can't find them :S
+            EnvironmentContainer
+          end
+        else
+          EnvironmentContainer
+        end
+      end
     end
   end
 end

lib/react/server_rendering/webpacker_manifest_container.rb

@@ -0,0 +1,27 @@
+require "open-uri"
+
+module React
+  module ServerRendering
+    # Get a compiled file from Webpacker
+    class WebpackerManifestContainer
+      def find_asset(logical_path)
+        asset_path = Webpacker::Manifest.lookup(logical_path) # raises if not found
+        if asset_path.start_with?("http")
+          # TODO: this includes webpack-dev-server code which causes ExecJS to 💥
+          dev_server_asset = open(asset_path).read
+        else
+          full_path = File.join(
+            # TODO: using `.parent` here won't work for nonstandard configurations
+            Webpacker::Configuration.output_path.parent,
+            asset_path
+          )
+          File.read(full_path)
+        end
+      end
+
+      def self.compatible?
+        !!defined?(Webpacker)
+      end
+    end
+  end
+end

lib/react/server_rendering/yaml_manifest_container.rb

@@ -1,6 +1,6 @@
 module React
   module ServerRendering
-    # Get asset content by reading the compiled file from disk using the generated maniftest.yml file
+    # Get asset content by reading the compiled file from disk using the generated manifest.yml file
     #
     # This is good for Rails production when assets are compiled to public/assets
     # but sometimes, they're compiled to other directories (or other servers)

react_ujs/dist/react_ujs.js

@@ -125,15 +125,16 @@ module.exports = function(ujs) {
 // Assume className is simple and can be found at top-level (window).
 // Fallback to eval to handle cases like 'My.React.ComponentName'.
 // Also, try to gracefully import Babel 6 style default exports
+var topLevel = typeof window === "undefined" ? this : window;
+
 module.exports = function(className) {
   var constructor;
-  var topLevel = typeof window === "undefined" ? this : window;
   // Try to access the class globally first
   constructor = topLevel[className];
 
   // If that didn't work, try eval
   if (!constructor) {
-    constructor = eval.call(topLevel, className);
+    constructor = eval(className);
   }
 
   // Lastly, if there is a default attribute try that
@@ -308,6 +309,12 @@ if (typeof window !== "undefined") {
   detectEvents(ReactRailsUJS)
 }
 
+// It's a bit of a no-no to populate the global namespace,
+// but we really need it!
+// We need access to this object for server rendering, and
+// we can't do a dynamic `require`, so we'll grab it from here:
+this.ReactRailsUJS = ReactRailsUJS
+
 module.exports = ReactRailsUJS
 
 

react_ujs/index.js

@@ -109,4 +109,10 @@ if (typeof window !== "undefined") {
   detectEvents(ReactRailsUJS)
 }
 
+// It's a bit of a no-no to populate the global namespace,
+// but we really need it!
+// We need access to this object for server rendering, and
+// we can't do a dynamic `require`, so we'll grab it from here:
+self.ReactRailsUJS = ReactRailsUJS
+
 module.exports = ReactRailsUJS

react_ujs/src/getConstructor/fromGlobal.js

@@ -1,15 +1,16 @@
 // Assume className is simple and can be found at top-level (window).
 // Fallback to eval to handle cases like 'My.React.ComponentName'.
 // Also, try to gracefully import Babel 6 style default exports
+var topLevel = typeof window === "undefined" ? this : window;
+
 module.exports = function(className) {
   var constructor;
-  var topLevel = typeof window === "undefined" ? this : window;
   // Try to access the class globally first
   constructor = topLevel[className];
 
   // If that didn't work, try eval
   if (!constructor) {
-    constructor = eval.call(topLevel, className);
+    constructor = eval(className);
   }
 
   // Lastly, if there is a default attribute try that

react_ujs/yarn.lock

@@ -993,8 +993,8 @@ [email protected]:
   resolved "https://registry.yarnpkg.com/ms/-/ms-0.7.2.tgz#ae25cf2512b3885a1d95d7f037868d8431124765"
 
 nan@^2.3.0:
-  version "2.5.1"
-  resolved "https://registry.yarnpkg.com/nan/-/nan-2.5.1.tgz#d5b01691253326a97a2bbee9e61c55d8d60351e2"
+  version "2.6.1"
+  resolved "https://registry.yarnpkg.com/nan/-/nan-2.6.1.tgz#8c84f7b14c96b89f57fbc838012180ec8ca39a01"
 
 node-libs-browser@^2.0.0:
   version "2.0.0"
@@ -1252,8 +1252,8 @@ randombytes@^2.0.0, randombytes@^2.0.1:
   resolved "https://registry.yarnpkg.com/randombytes/-/randombytes-2.0.3.tgz#674c99760901c3c4112771a31e521dc349cc09ec"
 
 rc@^1.1.7:
-  version "1.2.0"
-  resolved "https://registry.yarnpkg.com/rc/-/rc-1.2.0.tgz#c7de973b7b46297c041366b2fd3d2363b1697c66"
+  version "1.2.1"
+  resolved "https://registry.yarnpkg.com/rc/-/rc-1.2.1.tgz#2e03e8e42ee450b8cb3dce65be1bf8974e1dfd95"
   dependencies:
     deep-extend "~0.4.0"
     ini "~1.3.0"
@@ -1275,7 +1275,7 @@ read-pkg@^1.0.0:
     normalize-package-data "^2.3.2"
     path-type "^1.0.0"
 
-"readable-stream@^2.0.0 || ^1.1.13", readable-stream@^2.0.1, readable-stream@^2.0.2, readable-stream@^2.0.5, readable-stream@^2.1.0, readable-stream@^2.1.4:
+"readable-stream@^2.0.0 || ^1.1.13", readable-stream@^2.0.1, readable-stream@^2.0.2, readable-stream@^2.0.5, readable-stream@^2.1.4, readable-stream@^2.2.6:
   version "2.2.6"
   resolved "https://registry.yarnpkg.com/readable-stream/-/readable-stream-2.2.6.tgz#8b43aed76e71483938d12a8d46c6cf1a00b1f816"
   dependencies:
@@ -1447,12 +1447,12 @@ stream-browserify@^2.0.1:
     readable-stream "^2.0.2"
 
 stream-http@^2.3.1:
-  version "2.6.3"
-  resolved "https://registry.yarnpkg.com/stream-http/-/stream-http-2.6.3.tgz#4c3ddbf9635968ea2cfd4e48d43de5def2625ac3"
+  version "2.7.0"
+  resolved "https://registry.yarnpkg.com/stream-http/-/stream-http-2.7.0.tgz#cec1f4e3b494bc4a81b451808970f8b20b4ed5f6"
   dependencies:
     builtin-status-codes "^3.0.0"
     inherits "^2.0.1"
-    readable-stream "^2.1.0"
+    readable-stream "^2.2.6"
     to-arraybuffer "^1.0.0"
     xtend "^4.0.0"
 

test/dummy/app/controllers/server_controller.rb

@@ -1,5 +1,6 @@
 class ServerController < ApplicationController
   def show
+    @component_name = params[:component_name] || "TodoList"
     @todos = %w{todo1 todo2 todo3}
   end
 

test/dummy/app/javascript/components/GreetingMessage.js

@@ -0,0 +1,23 @@
+var React = require("react")
+
+module.exports = React.createClass({
+  getInitialState: function() {
+    var initialGreeting = 'Hello';
+    if (typeof global !== "undefined" && global.ctx && global.ctx.greeting) {
+      initialGreeting = global.ctx.greeting
+    }
+
+    return {
+      greeting: initialGreeting
+    }
+  },
+  goodbye: function() {
+    this.setState({greeting: 'Goodbye'});
+  },
+  render: function() {
+    return React.DOM.div({},
+      React.DOM.div({}, this.state.greeting, ' ', this.props.name),
+      React.DOM.button({onClick: this.goodbye}, 'Goodbye')
+    );
+  }
+});

test/dummy/app/javascript/components/Todo.js

@@ -0,0 +1,6 @@
+var React = require("react")
+module.exports = React.createClass({
+  render: function() {
+    return React.createElement("li", null, this.props.todo)
+  }
+})

test/dummy/app/javascript/components/TodoList.js

@@ -0,0 +1,21 @@
+var React = require("react")
+
+module.exports = React.createClass({
+  getInitialState: function() {
+    return({mounted: "nope"});
+  },
+  componentWillMount: function() {
+    this.setState({mounted: 'yep'});
+  },
+  render: function() {
+    return (
+      <ul>
+        <li id='status'>{this.state.mounted}</li>
+        {this.props.todos.map(function(todo, i) {
+          return (<li key={i}>{todo}</li>)
+        })}
+        <li>From Webpacker</li>
+      </ul>
+    )
+  }
+})

test/dummy/app/javascript/components/TodoListWithConsoleLog.js

@@ -0,0 +1,25 @@
+var React = require("react")
+
+module.exports = React.createClass({
+  getInitialState: function() {
+    console.log('got initial state');
+    return({mounted: "nope"});
+  },
+  componentWillMount: function() {
+    console.warn('mounted component');
+    this.setState({mounted: 'yep'});
+  },
+  render: function() {
+    var x = 'foo';
+    console.error('rendered!', x);
+    return (
+      <ul>
+        <li>Console Logged</li>
+        <li id='status'>{this.state.mounted}</li>
+        {this.props.todos.map(function(todo, i) {
+          return (<li key={i}>{todo}</li>)
+        })}
+      </ul>
+    )
+  }
+})

test/dummy/app/javascript/components/WithSetTimeout.js

@@ -0,0 +1,10 @@
+var React = require("react")
+module.exports = React.createClass({
+  componentWillMount: function () {
+    setTimeout(function () {}, 1000)
+    clearTimeout(0)
+  },
+  render: function () {
+    return <span>I am rendered!</span>
+  }
+})

test/dummy/app/javascript/packs/server_rendering.js

@@ -0,0 +1,5 @@
+// By default, this pack is loaded for server-side rendering.
+// It must expose react_ujs as `ReactRailsUJS` and prepare a require context.
+var componentRequireContext = require.context("components", true)
+var ReactRailsUJS = require("../../../../../react_ujs/index")
+ReactRailsUJS.loadContext(componentRequireContext)

test/dummy/app/views/server/show.html.erb

@@ -1 +1 @@
-<%= react_component "TodoList", {todos: @todos}, {prerender: true} %>
+<%= react_component @component_name, {todos: @todos}, {prerender: true} %>

test/helper_files/TodoListWithUpdates.js

@@ -0,0 +1,10 @@
+var React = require("react")
+module.exports = React.createClass({
+  render: function() {
+    return (
+      <ul>
+        <li>Updated</li>
+      </ul>
+    )
+  }
+})

test/react/rails/component_mount_test.rb

@@ -3,6 +3,7 @@
 when_sprockets_available do
   class ComponentMountTest < ActionDispatch::IntegrationTest
     setup do
+      WebpackerHelpers.compile_if_missing
       @helper = React::Rails::ComponentMount.new
     end
 

test/react/rails/controller_lifecycle_test.rb

@@ -24,6 +24,7 @@ def react_component(*args)
 
 class ControllerLifecycleTest < ActionDispatch::IntegrationTest
   def setup
+    WebpackerHelpers.compile_if_missing
     @previous_helper_implementation = React::Rails::ViewHelper.helper_implementation_class
     React::Rails::ViewHelper.helper_implementation_class = DummyHelperImplementation
   end