upgrade to ember-cli 3.20 and other dependencies

.eslintrc.js

@@ -20,9 +20,7 @@ module.exports = {
   env: {
     browser: true
   },
-  rules: {
-    'ember/no-jquery': 'error'
-  },
+  rules: {},
   overrides: [
     // node files
     {
@@ -50,9 +48,7 @@ module.exports = {
         node: true
       },
       plugins: ['node'],
-      rules: Object.assign({}, require('eslint-plugin-node').configs.recommended.rules, {
-        // add your custom rules and overrides for node files here
-      })
+      extends: ['plugin:node/recommended']
     }
   ]
 };

.travis.yml

@@ -5,7 +5,7 @@ node_js:
   # so that your addon works for all apps
   - "10"
 
-dist: trusty
+dist: xenial
 
 addons:
   chrome: stable

config/ember-try.js

@@ -37,16 +37,6 @@ module.exports = async function() {
           }
         }
       },
-      // The default `.travis.yml` runs this scenario via `npm test`,
-      // not via `ember try`. It's still included here so that running
-      // `ember try:each` manually or from a customized CI config will run it
-      // along with all the other scenarios.
-      {
-        name: 'ember-default',
-        npm: {
-          devDependencies: {}
-        }
-      },
       {
         name: 'ember-default-with-jquery',
         env: {

package.json

@@ -30,14 +30,14 @@
     "ember-compatibility-test": "ember try:each"
   },
   "dependencies": {
-    "@glimmer/component": "^1.0.0",
-    "@glimmer/tracking": "^1.0.0",
+    "@glimmer/component": "^1.0.1",
+    "@glimmer/tracking": "^1.0.1",
     "broccoli-concat": "^4.2.4",
-    "broccoli-funnel": "^3.0.2",
-    "ember-auto-import": "^1.5.3",
-    "ember-cli-babel": "^7.18.0",
-    "ember-cli-htmlbars": "^4.2.3",
-    "ember-composable-helpers": "^3.1.1",
+    "broccoli-funnel": "^3.0.3",
+    "ember-auto-import": "^1.6.0",
+    "ember-cli-babel": "^7.21.0",
+    "ember-cli-htmlbars": "^5.2.0",
+    "ember-composable-helpers": "^3.2.0",
     "ember-concurrency": "^1.2.1",
     "ember-concurrency-test-waiter": "^0.3.2",
     "ember-moment": "^8.0.0",
@@ -48,37 +48,37 @@
   },
   "devDependencies": {
     "@ember/optional-features": "^1.3.0",
-    "@percy/ember": "^2.1.0",
+    "@percy/ember": "^2.1.3",
     "auto-changelog": "github:mansona/auto-changelog#epic",
     "babel-eslint": "^10.1.0",
     "broccoli-asset-rev": "^3.0.0",
-    "ember-cli": "~3.17.0",
+    "ember-cli": "~3.20.0",
     "ember-cli-dependency-checker": "^3.2.0",
-    "ember-cli-fastboot": "^2.2.1",
+    "ember-cli-fastboot": "^2.2.3",
     "ember-cli-inject-live-reload": "^2.0.2",
     "ember-cli-sri": "^2.1.1",
     "ember-cli-uglify": "^3.0.0",
-    "ember-data": "^3.17.0",
+    "ember-data": "^3.20.0",
     "ember-disable-prototype-extensions": "^1.1.3",
     "ember-export-application-global": "^2.0.1",
-    "ember-fetch": "^7.0.1",
+    "ember-fetch": "^8.0.2",
     "ember-load-initializers": "^2.1.1",
     "ember-maybe-import-regenerator": "^0.1.6",
     "ember-qunit": "^4.6.0",
-    "ember-resolver": "^7.0.0",
-    "ember-source": "~3.17.0",
+    "ember-resolver": "^8.0.0",
+    "ember-source": "~3.20.2",
     "ember-source-channel-url": "^2.0.1",
-    "ember-template-lint": "^2.4.0",
-    "ember-test-selectors": "^4.0.0",
+    "ember-template-lint": "^2.9.1",
+    "ember-test-selectors": "^4.1.0",
     "ember-try": "^1.4.0",
-    "empress-blog": "^1.8.1",
-    "eslint": "^6.8.0",
-    "eslint-plugin-ember": "^7.10.1",
-    "eslint-plugin-node": "^11.0.0",
+    "empress-blog": "^1.9.0",
+    "eslint": "^7.5.0",
+    "eslint-plugin-ember": "^8.9.1",
+    "eslint-plugin-node": "^11.1.0",
     "loader.js": "^4.7.0",
     "npm-run-all": "^4.1.5",
-    "prember": "^1.0.3",
-    "qunit-dom": "^1.1.0"
+    "prember": "^1.0.5",
+    "qunit-dom": "^1.2.0"
   },
   "engines": {
     "node": "10.* || >= 12"

tests/dummy/app/app.js

@@ -1,7 +1,7 @@
 import Application from '@ember/application';
 import Resolver from 'ember-resolver';
 import loadInitializers from 'ember-load-initializers';
-import config from './config/environment';
+import config from 'dummy/config/environment';
 
 export default class App extends Application {
   modulePrefix = config.modulePrefix;

tests/dummy/app/router.js

@@ -1,5 +1,5 @@
 import EmberRouter from '@ember/routing/router';
-import config from './config/environment';
+import config from 'dummy/config/environment';
 
 export default class Router extends EmberRouter {
   location = config.locationType;

tests/dummy/config/ember-cli-update.json

@@ -0,0 +1,20 @@
+{
+  "schemaVersion": "1.0.0",
+  "packages": [
+    {
+      "name": "ember-cli",
+      "version": "3.20.0",
+      "blueprints": [
+        {
+          "name": "addon",
+          "outputRepo": "https://github.com/ember-cli/ember-addon-output",
+          "codemodsSource": "ember-addon-codemods-manifest@1",
+          "isBaseBlueprint": true,
+          "options": [
+            "--no-welcome"
+          ]
+        }
+      ]
+    }
+  ]
+}

tests/dummy/config/targets.js

@@ -6,7 +6,7 @@ const browsers = [
   'last 1 Safari versions'
 ];
 
-const isCI = !!process.env.CI;
+const isCI = Boolean(process.env.CI);
 const isProduction = process.env.EMBER_ENV === 'production';
 
 if (isCI || isProduction) {

tests/test-helper.js

@@ -1,5 +1,5 @@
-import Application from '../app';
-import config from '../config/environment';
+import Application from 'dummy/app';
+import config from 'dummy/config/environment';
 import { setApplication } from '@ember/test-helpers';
 import { start } from 'ember-qunit';