chore: introduce cacheKeyForTree to avoid running treeForX multiple t…

…imes

index.js

@@ -16,6 +16,7 @@ const path = require('path');
 const getBabelOptions = require('./lib/get-babel-options');
 const findApp = require('./lib/find-app');
 const emberPlugins = require('./lib/ember-plugins');
+const cacheKeyForTree = require('calculate-cache-key-for-tree');
 
 const APP_BABEL_RUNTIME_VERSION = new WeakMap();
 const PROJECTS_WITH_VALID_EMBER_CLI = new WeakSet();
@@ -273,6 +274,17 @@ module.exports = {
     return polyfillTree;
   },
 
+  cacheKeyForTree(treeType) {
+    if (treeType === 'addon') {
+      let isRootBabel = this.parent === this.project;
+      let shouldIncludeHelpers = isRootBabel && _shouldIncludeHelpers(this._getAppOptions(), this);
+
+      return cacheKeyForTree('addon', this, [shouldIncludeHelpers]);
+    }
+
+    return cacheKeyForTree(treeType, this);
+  },
+
   included: function(app) {
     this._super.included.apply(this, arguments);
     this.app = app;

package.json

@@ -71,6 +71,7 @@
   "devDependencies": {
     "babel-eslint": "^10.1.0",
     "broccoli-test-helper": "^1.4.0",
+    "calculate-cache-key-for-tree": "^2.0.0",
     "chai": "^4.1.2",
     "co": "^4.6.0",
     "common-tags": "^1.8.0",

yarn.lock

@@ -3662,6 +3662,13 @@ calculate-cache-key-for-tree@^1.0.0:
   dependencies:
     json-stable-stringify "^1.0.1"
 
+calculate-cache-key-for-tree@^2.0.0:
+  version "2.0.0"
+  resolved "https://registry.yarnpkg.com/calculate-cache-key-for-tree/-/calculate-cache-key-for-tree-2.0.0.tgz#7ac57f149a4188eacb0a45b210689215d3fef8d6"
+  integrity sha512-Quw8a6y8CPmRd6eU+mwypktYCwUcf8yVFIRbNZ6tPQEckX9yd+EBVEPC/GSZZrMWH9e7Vz4pT7XhpmyApRByLQ==
+  dependencies:
+    json-stable-stringify "^1.0.1"
+
 call-bind@^1.0.0:
   version "1.0.2"
   resolved "https://registry.yarnpkg.com/call-bind/-/call-bind-1.0.2.tgz#b1d4e89e688119c3c9a903ad30abb2f6a919be3c"