use esm for requiring default and deprecated features

broccoli/features.js

@@ -1,35 +1,12 @@
 'use strict';
 
-const fs = require('fs');
-const ts = require('./typescript');
-
+const requireEsm = require('esm')(module);
 function getFeatures() {
-  let fileName = 'packages/@ember/canary-features/index.ts';
-  let fileContents = fs.readFileSync(fileName).toString();
-
-  let sourceFile = ts.createSourceFile(
-    fileName,
-    fileContents,
-    ts.ScriptTarget.ES2017,
-    /*setParentNodes */ true
+  const { default: features } = requireEsm(
+    '../packages/@ember/canary-features/default-features.js'
   );
 
-  let features;
-
-  ts.forEachChild(sourceFile, processVariableDeclarations);
-
-  function processVariableDeclarations(node) {
-    if (node.kind === ts.SyntaxKind.VariableDeclaration && node.name.text === 'DEFAULT_FEATURES') {
-      let featuresText = node.initializer.getFullText();
-      features = new Function(`return ${featuresText}`)();
-      return;
-    }
-
-    ts.forEachChild(node, processVariableDeclarations);
-  }
-
   let featureName;
-
   if (process.env.BUILD_TYPE === 'alpha') {
     for (featureName in features) {
       if (features[featureName] === null) {

package.json

@@ -140,6 +140,7 @@
     "eslint-plugin-node": "^8.0.1",
     "eslint-plugin-prettier": "^3.1.0",
     "eslint-plugin-qunit": "^4.0.0",
+    "esm": "^3.2.25",
     "execa": "^2.0.1",
     "express": "^4.17.1",
     "finalhandler": "^1.1.2",

packages/@ember/canary-features/default-features.js

@@ -0,0 +1,23 @@
+/*
+  This list of features is used both at build time (by `broccoli/features.js`)
+  and at runtime (by `@ember/canary-features`).
+
+  The valid values are:
+
+  - true - The feature is enabled at all times, and cannot be disabled.
+  - false - The feature is disabled at all times, and cannot be enabled.
+  - null - The feature is disabled by default, but can be enabled at runtime via `EmberENV`.
+*/
+export default {
+  EMBER_LIBRARIES_ISREGISTERED: null,
+  EMBER_IMPROVED_INSTRUMENTATION: null,
+  EMBER_MODULE_UNIFICATION: false,
+  EMBER_METAL_TRACKED_PROPERTIES: true,
+  EMBER_GLIMMER_FORWARD_MODIFIERS_WITH_SPLATTRIBUTES: true,
+  EMBER_GLIMMER_ANGLE_BRACKET_BUILT_INS: true,
+  EMBER_NATIVE_DECORATOR_SUPPORT: true,
+  EMBER_GLIMMER_FN_HELPER: true,
+  EMBER_CUSTOM_COMPONENT_ARG_PROXY: true,
+  EMBER_FRAMEWORK_OBJECT_OWNER_ARGUMENT: true,
+  EMBER_GLIMMER_SET_COMPONENT_TEMPLATE: null,
+};

packages/@ember/canary-features/index.ts

@@ -12,19 +12,8 @@ import { assign } from '@ember/polyfills';
   @public
 */
 
-export const DEFAULT_FEATURES = {
-  EMBER_LIBRARIES_ISREGISTERED: null,
-  EMBER_IMPROVED_INSTRUMENTATION: null,
-  EMBER_MODULE_UNIFICATION: false,
-  EMBER_METAL_TRACKED_PROPERTIES: true,
-  EMBER_GLIMMER_FORWARD_MODIFIERS_WITH_SPLATTRIBUTES: true,
-  EMBER_GLIMMER_ANGLE_BRACKET_BUILT_INS: true,
-  EMBER_NATIVE_DECORATOR_SUPPORT: true,
-  EMBER_GLIMMER_FN_HELPER: true,
-  EMBER_CUSTOM_COMPONENT_ARG_PROXY: true,
-  EMBER_FRAMEWORK_OBJECT_OWNER_ARGUMENT: true,
-  EMBER_GLIMMER_SET_COMPONENT_TEMPLATE: null,
-};
+import { default: DEFAULT_FEATURES } from '@ember/canary-features/default-features';
+export const DEFAULT_FEATURES;
 
 /**
   The hash of enabled Canary features. Add to this, any canary features

yarn.lock

@@ -3390,6 +3390,11 @@ eslint@^5.16.0:
     table "^5.2.3"
     text-table "^0.2.0"
 
+esm@^3.2.25:
+  version "3.2.25"
+  resolved "https://registry.yarnpkg.com/esm/-/esm-3.2.25.tgz#342c18c29d56157688ba5ce31f8431fbb795cc10"
+  integrity sha512-U1suiZ2oDVWv4zPO56S0NcR5QriEahGtdN2OR6FiOG4WJvcjBVFB0qI4+eKoWFH483PKGuLuu6V8Z4T5g63UVA==
+
 esm@^3.2.4:
   version "3.2.22"
   resolved "https://registry.yarnpkg.com/esm/-/esm-3.2.22.tgz#5062c2e22fee3ccfee4e8f20da768330da90d6e3"