[v4] Drop ember-compatibility-helpers]

addon/-private/data-view/elements/occluded-content.js

@@ -1,6 +1,5 @@
 import { set } from '@ember/object';
 import { DEBUG } from '@glimmer/env';
-import { IS_GLIMMER_2, gte as emberVersionGTE } from 'ember-compatibility-helpers';
 
 import document from '../../utils/document-shim';
 
@@ -27,12 +26,6 @@ export default class OccludedContent {
     this.isOccludedContent = true;
     this.rendered = false;
 
-    if (!emberVersionGTE('3.0.0')) {
-      // In older versions of Ember, binding anything on an object in the template
-      // adds observers which creates __ember_meta__
-      this.__ember_meta__ = null; // eslint-disable-line camelcase
-    }
-
     if (DEBUG) {
       Object.preventExtensions(this);
     }
@@ -57,11 +50,11 @@ export default class OccludedContent {
   }
 
   get realUpperBound() {
-    return IS_GLIMMER_2 ? this.upperBound : this.upperBound.previousSibling;
+    return this.upperBound;
   }
 
   get realLowerBound() {
-    return IS_GLIMMER_2 ? this.lowerBound : this.lowerBound.nextSibling;
+    return this.lowerBound;
   }
 
   get parentNode() {

addon/-private/data-view/elements/virtual-component.js

@@ -1,7 +1,6 @@
 import { set } from '@ember/object';
 import { assert } from '@ember/debug';
 import { DEBUG } from '@glimmer/env';
-import { IS_GLIMMER_2, gte as emberVersionGTE } from 'ember-compatibility-helpers';
 
 import document from '../../utils/document-shim';
 
@@ -22,23 +21,17 @@ export default class VirtualComponent {
 
     this.rendered = false;
 
-    if (!emberVersionGTE('3.0.0')) {
-      // In older versions of Ember, binding anything on an object in the template
-      // adds observers which creates __ember_meta__
-      this.__ember_meta__ = null; // eslint-disable-line camelcase
-    }
-
     if (DEBUG) {
       Object.preventExtensions(this);
     }
   }
 
   get realUpperBound() {
-    return IS_GLIMMER_2 ? this.upperBound : this.upperBound.previousSibling;
+    return this.upperBound;
   }
 
   get realLowerBound() {
-    return IS_GLIMMER_2 ? this.lowerBound : this.lowerBound.nextSibling;
+    return this.lowerBound;
   }
 
   getBoundingClientRect() {

package.json

@@ -58,7 +58,6 @@
     "ember-cli-babel": "^7.12.0",
     "ember-cli-htmlbars": "^6.0.0",
     "ember-cli-version-checker": "^5.1.2",
-    "ember-compatibility-helpers": "^1.2.1",
     "ember-raf-scheduler": "^0.3.0"
   },
   "devDependencies": {

tests/integration/basic-test.js

@@ -21,34 +21,12 @@ import {
   standardTemplate
 } from 'dummy/tests/helpers/test-scenarios';
 
-import { scheduler } from 'ember-raf-scheduler';
-import { gte as emberVersionGTE } from 'ember-compatibility-helpers';
-
-// Assert an odd timing: After initial render but before settledness. Because
-// of changes to the `render` helper in test-helpers, this should be done
-// differently in ember-test-helpers 1.x and 2.x.
-//
-// Use ember-compatibility-helpers < 3 as a proxy for identifying
-// ember-test-helpers 1.x.
-//
-// This helpers can be killed off when Ember 2.18 support is dropped. The
-// gte Ember 3 version can be inlined where the helper is used.
+// Assert an odd timing: After initial render but before settledness.
 //
 async function assertAfterInitialRender(renderFn, assertFn) {
-  if (emberVersionGTE('3.0.0')) {
-    renderFn();
-    await new Promise(resolve => requestAnimationFrame(resolve));
-    assertFn();
-  } else {
-    // After ember-raf-schedulers queues have flushed.
-    // The schedule of sync inside measure starts a second flush.
-    scheduler.schedule('measure', () => {
-      scheduler.schedule('sync', () => {
-        assertFn();
-      });
-    });
-    renderFn();
-  }
+  renderFn();
+  await new Promise(resolve => requestAnimationFrame(resolve));
+  assertFn();
 }
 
 module('vertical-collection', 'Integration | Basic Tests', function(hooks) {