Merge pull request #41 from alexBaizeau/support-dce-babili

Replace featureFlags inline by their values when minifying

index.js

@@ -16,7 +16,7 @@ module.exports = {
 
     var checker = new VersionChecker(this);
     checker.forEmber().assertAbove('2.9.0');
-    
+
     this.htmlbarsVersion = checker.for('ember-cli-htmlbars', 'npm');
   },
 
@@ -57,6 +57,33 @@ module.exports = {
     target.registry.add('htmlbars-ast-plugin', templateCompilerInstance);
   },
 
+  setupPreprocessorRegistry: function(type, registry) {
+    registry.add('js', {
+      name: 'ember-cli-conditional-compile',
+      ext: 'js',
+      toTree: (tree) => this.transpileTree(tree)
+    });
+  },
+
+  /**
+   * Inline feature flags value so that babili's dead code elimintation plugin
+   * removes the code non reachable.
+   */
+  transpileTree(tree, config) {
+    var esTranspiler = require('broccoli-babel-transpiler');
+    var inlineFeatureFlags = require('babel-plugin-inline-replace-variables');
+    var config = this.project.config(EmberApp.env());
+    if (!this.enableCompile) {
+      return tree;
+    }
+    return esTranspiler(tree, {
+      plugins: [
+        [ inlineFeatureFlags, config.featureFlags ]
+      ]
+    });
+  },
+
+
   postprocessTree: function(type, tree) {
     if (type !== 'js') return tree;
 

package.json

@@ -47,6 +47,8 @@
     "loader.js": "4.2.3"
   },
   "dependencies": {
+    "babel-plugin-inline-replace-variables": "https://github.com/alexBaizeau/babel-plugin-inline-replace-variables.git#8d55becd00acca84b6f301ad346aeed9507949a3",
+    "broccoli-babel-transpiler": "^6.0.0",
     "broccoli-funnel": "~1.1.0",
     "broccoli-replace": "0.12.0",
     "chalk": "~1.1.0",

yarn.lock

@@ -489,6 +489,12 @@ babel-plugin-inline-environment-variables@^1.0.1:
   version "1.0.1"
   resolved "https://registry.yarnpkg.com/babel-plugin-inline-environment-variables/-/babel-plugin-inline-environment-variables-1.0.1.tgz#1f58ce91207ad6a826a8bf645fafe68ff5fe3ffe"
 
+"babel-plugin-inline-replace-variables@https://github.com/alexBaizeau/babel-plugin-inline-replace-variables.git#8d55becd00acca84b6f301ad346aeed9507949a3":
+  version "1.3.0"
+  resolved "https://github.com/alexBaizeau/babel-plugin-inline-replace-variables.git#8d55becd00acca84b6f301ad346aeed9507949a3"
+  dependencies:
+    babylon "^6.17.0"
+
 babel-plugin-jscript@^1.0.4:
   version "1.0.4"
   resolved "https://registry.yarnpkg.com/babel-plugin-jscript/-/babel-plugin-jscript-1.0.4.tgz#8f342c38276e87a47d5fa0a8bd3d5eb6ccad8fcc"
@@ -848,6 +854,10 @@ babylon@^6.11.0, babylon@^6.15.0, babylon@^6.16.1:
   version "6.16.1"
   resolved "https://registry.yarnpkg.com/babylon/-/babylon-6.16.1.tgz#30c5a22f481978a9e7f8cdfdf496b11d94b404d3"
 
+babylon@^6.17.0:
+  version "6.17.1"
+  resolved "https://registry.yarnpkg.com/babylon/-/babylon-6.17.1.tgz#17f14fddf361b695981fe679385e4f1c01ebd86f"
+
 backbone@^1.1.2:
   version "1.3.3"
   resolved "https://registry.yarnpkg.com/backbone/-/backbone-1.3.3.tgz#4cc80ea7cb1631ac474889ce40f2f8bc683b2999"