[BUGFIX lts] Adds the babel-helpers injection plugin back

Helpers were no longer being externalized in our builds, which adds a
significant amount to the final payload. This adds them back into the
build.

Also fixes an issue where the template compiler was not being included
in the vendor folder for Ember.

lib/index.js

@@ -7,6 +7,7 @@ const resolve = require('resolve');
 const concatBundle = require('./concat-bundle');
 const buildDebugMacroPlugin = require('./build-debug-macro-plugin');
 const buildStripClassCallcheckPlugin = require('./build-strip-class-callcheck-plugin');
+const injectBabelHelpers = require('./transforms/inject-babel-helpers');
 
 const isProduction = process.env.EMBER_ENV === 'production';
 
@@ -79,6 +80,7 @@ module.exports = {
       babel: Object.assign({}, babelOptions, {
         loose: true,
         plugins: [
+          injectBabelHelpers,
           buildDebugMacroPlugin(!isProduction),
           [
             require.resolve('@babel/plugin-transform-block-scoping'),
@@ -157,6 +159,11 @@ module.exports = {
       files: ['jquery.js'],
     });
 
+    let templateCompiler = new Funnel(tree, {
+      destDir: 'ember',
+      include: ['ember-template-compiler.js', 'ember-template-compiler.map'],
+    });
+
     let ember;
     let targets = (this.project && this.project.targets && this.project.targets.browsers) || [];
 
@@ -174,6 +181,6 @@ module.exports = {
       });
     }
 
-    return new MergeTrees([ember, jquery]);
+    return new MergeTrees([ember, templateCompiler, jquery]);
   },
 };

package.json

@@ -48,6 +48,7 @@
     "test:browserstack": "node bin/run-browserstack-tests.js"
   },
   "dependencies": {
+    "@babel/helper-module-imports": "^7.0.0",
     "@babel/plugin-transform-block-scoping": "^7.4.4",
     "@babel/plugin-transform-object-assign": "^7.2.0",
     "babel-plugin-debug-macros": "^0.3.2",
@@ -70,7 +71,6 @@
     "silent-error": "^1.1.1"
   },
   "devDependencies": {
-    "@babel/helper-module-imports": "^7.0.0",
     "@babel/preset-env": "^7.5.5",
     "@glimmer/compiler": "0.38.5-alpha.2",
     "@glimmer/env": "^0.1.7",