[FEATURE] Adds support for parenless data decorators

Adds support for `@attr`, `@belongsTo`, `@hasMany` without parens

.eslintrc.js

@@ -3,7 +3,10 @@ module.exports = {
   parser: 'babel-eslint',
   parserOptions: {
     ecmaVersion: 2017,
-    sourceType: 'module'
+    sourceType: 'module',
+    ecmaFeatures: {
+      legacyDecorators: true
+    }
   },
   plugins: [
     'ember'

.travis.yml

@@ -3,7 +3,7 @@ language: node_js
 node_js:
   # we recommend testing addons with the same minimum supported node version as Ember CLI
   # so that your addon works for all apps
-  - '6'
+  - '8'
 
 sudo: false
 dist: trusty

config/ember-try.js

@@ -42,6 +42,15 @@ module.exports = function() {
             }
           }
         },
+        {
+          name: 'ember-lts-3.12',
+          npm: {
+            devDependencies: {
+              'ember-data': '~3.12.0',
+              'ember-source': '~3.12.0'
+            }
+          }
+        },
         {
           name: 'ember-release',
           npm: {

index.js

@@ -9,8 +9,9 @@ module.exports = {
 
     let checker = new VersionChecker(this.project);
     let emberVersion = checker.forEmber();
+    let emberDataVersion = checker.for('ember-data');
 
-    this.shouldPolyfill = emberVersion.lt('3.10.0-alpha.1');
+    this.shouldPolyfill = emberVersion.lt('3.10.0-alpha.0') || emberDataVersion.lt('3.10.0-alpha.0');
   },
 
   included() {

package.json

@@ -38,7 +38,7 @@
     "ember-cli-sri": "^2.1.1",
     "ember-cli-template-lint": "^1.0.0-beta.1",
     "ember-cli-uglify": "^2.1.0",
-    "ember-data": "^3.9.0",
+    "ember-data": "~3.9.0",
     "ember-disable-prototype-extensions": "^1.1.3",
     "ember-export-application-global": "^2.0.0",
     "ember-load-initializers": "^1.1.0",
@@ -54,7 +54,7 @@
     "qunit-dom": "^0.8.0"
   },
   "engines": {
-    "node": "6.* || 8.* || >= 10.*"
+    "node": "8.* || >= 10.*"
   },
   "ember-addon": {
     "configPath": "tests/dummy/config",

tests/unit/action-test.js

@@ -6,6 +6,7 @@ import { setupRenderingTest, skip } from 'ember-qunit';
 import { render, click, findAll } from '@ember/test-helpers';
 import hbs from 'htmlbars-inline-precompile';
 
+
 function registerComponent(
   test,
   name,

tests/unit/data-test.js

@@ -67,4 +67,44 @@ module('ember-data', function(hooks) {
 
     assert.equal(names, expectedNames, 'The correct records are in the array');
   });
+
+  test('@attr can be used without parens', async function(assert) {
+    let Post = class extends DS.Model {
+      @DS.attr name;
+    };
+
+    register(`model:post`, Post);
+    stubAdapter();
+
+    let store = getService('store');
+    let posts = await store.peekAll('post');
+    let names = posts
+      .toArray()
+      .map(post => get(post, 'name'))
+      .join();
+
+    assert.equal(names, expectedNames, 'The correct records are in the array');
+  });
+
+  if (gte('ember-data', '3.11.0')) {
+    test('@attr works with module imports without parens', async function(assert) {
+      let { default: Model, attr } = window.require('@ember-data/model');
+
+      let Post = class extends Model {
+        @attr name;
+      };
+
+      register(`model:post`, Post);
+      stubAdapter();
+
+      let store = getService('store');
+      let posts = await store.peekAll('post');
+      let names = posts
+        .toArray()
+        .map(post => get(post, 'name'))
+        .join();
+
+      assert.equal(names, expectedNames, 'The correct records are in the array');
+    });
+  }
 });