Update this addon to a more modern approach

.editorconfig

@@ -4,7 +4,6 @@
 
 root = true
 
-
 [*]
 end_of_line = lf
 charset = utf-8

.eslintignore

@@ -0,0 +1,22 @@
+# unconventional js
+/blueprints/*/files/
+/vendor/
+
+# compiled output
+/dist/
+/tmp/
+
+# dependencies
+/bower_components/
+/node_modules/
+
+# misc
+/coverage/
+!.*
+.*/
+.eslintcache
+
+# ember-try
+/.node_modules.ember-try/
+/bower.json.ember-try
+/package.json.ember-try

.eslintrc.js

@@ -1,13 +1,59 @@
+'use strict';
+
 module.exports = {
   root: true,
+  parser: 'babel-eslint',
   parserOptions: {
-    ecmaVersion: 2017,
-    sourceType: 'module'
+    ecmaVersion: 2018,
+    sourceType: 'module',
+    ecmaFeatures: {
+      legacyDecorators: true,
+    },
   },
-  extends: 'eslint:recommended',
+  plugins: ['ember'],
+  extends: [
+    'eslint:recommended',
+    'plugin:ember/recommended',
+    'plugin:prettier/recommended',
+  ],
   env: {
-    browser: true
+    browser: true,
   },
-  rules: {
-  }
+  rules: {},
+  overrides: [
+    // node files
+    {
+      files: [
+        '.eslintrc.js',
+        '.prettierrc.js',
+        '.template-lintrc.js',
+        'ember-cli-build.js',
+        'index.js',
+        'testem.js',
+        'blueprints/*/index.js',
+        'config/**/*.js',
+        'tests/dummy/config/**/*.js',
+      ],
+      excludedFiles: [
+        'addon/**',
+        'addon-test-support/**',
+        'app/**',
+        'tests/dummy/app/**',
+      ],
+      parserOptions: {
+        sourceType: 'script',
+      },
+      env: {
+        browser: false,
+        node: true,
+      },
+      plugins: ['node'],
+      extends: ['plugin:node/recommended'],
+    },
+    {
+      // Test files:
+      files: ['tests/**/*-test.{js,ts}'],
+      extends: ['plugin:qunit/recommended'],
+    },
+  ],
 };

.github/workflow/ci.yml

@@ -0,0 +1,136 @@
+name: CI
+
+on:
+  push:
+    branches:
+      - main
+    tags:
+      - '*'
+  pull_request:
+  schedule:
+    - cron: '0 4 * * 5' # Fridays at 4am
+
+jobs:
+  dependencies:
+    name: Install dependencies
+    runs-on: ubuntu-latest
+    timeout-minutes: 10
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v2
+
+      - name: Setup node
+        uses: actions/setup-node@v2
+        with:
+          node-version: '12.x'
+
+      - name: Use Yarn cache
+        uses: actions/cache@v2
+        id: yarn-cache
+        with:
+          path: '**/node_modules'
+          key: ${{ runner.os }}-yarn-12.x-${{ hashFiles('**/yarn.lock') }}
+          restore-keys: |
+            ${{ runner.os }}-yarn-12.x
+      - run: yarn install --frozen-lockfile
+        if: steps.yarn-cache.outputs.cache-hit != 'true'
+
+  lint:
+    needs: dependencies
+    name: Lint
+    runs-on: ubuntu-latest
+    timeout-minutes: 5
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v2
+
+      - name: Setup node
+        uses: actions/setup-node@v2
+        with:
+          node-version: '12.x'
+
+      - name: Use Yarn cache
+        uses: actions/cache@v2
+        id: yarn-cache
+        with:
+          path: '**/node_modules'
+          key: ${{ runner.os }}-yarn-12.x-${{ hashFiles('**/yarn.lock') }}
+          restore-keys: |
+            ${{ runner.os }}-yarn-12.x
+      - name: ESLint
+        uses: wearerequired/lint-action@v1
+        with:
+          eslint: true
+          prettier: true
+
+      - name: Ember Template Lint
+        run: yarn lint:hbs
+
+  test:
+    needs: dependencies
+    name: Tests
+    runs-on: ubuntu-latest
+    timeout-minutes: 20
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v2
+
+      - name: Setup node
+        uses: actions/setup-node@v2
+        with:
+          node-version: '12.x'
+
+      - name: Use Yarn cache
+        uses: actions/cache@v2
+        id: yarn-cache
+        with:
+          path: '**/node_modules'
+          key: ${{ runner.os }}-yarn-12.x-${{ hashFiles('**/yarn.lock') }}
+          restore-keys: |
+            ${{ runner.os }}-yarn-12.x
+      - name: Run tests
+        run: yarn test:ember
+
+  test-try:
+    name: Scenario Tests
+    runs-on: ubuntu-latest
+    timeout-minutes: 5
+    continue-on-error: ${{ matrix.allow-failure || false }}
+    needs:
+      - test
+    strategy:
+      fail-fast: true
+      matrix:
+        scenario:
+          - ember-lts-3.16
+          - ember-lts-3.20
+          - ember-lts-3.24
+          - ember-release
+          - ember-beta
+          - ember-default-with-jquery
+          - ember-classic
+          - embroider-safe
+          - embroider-optimized
+        allow-failure: [false]
+        include:
+          - scenario: ember-canary
+            allow-failure: true
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v2
+
+      - name: Setup node
+        uses: actions/setup-node@v2
+        with:
+          node-version: '12.x'
+
+      - name: Use Yarn cache
+        uses: actions/cache@v2
+        id: yarn-cache
+        with:
+          path: '**/node_modules'
+          key: ${{ runner.os }}-yarn-12.x-${{ hashFiles('**/yarn.lock') }}
+          restore-keys: |
+            ${{ runner.os }}-yarn-12.x
+      - name: Test
+        run: yarn ember try:one ${{ matrix.scenario }}

.gitignore

@@ -1,23 +1,26 @@
 # See https://help.github.com/ignore-files/ for more about ignoring files.
 
 # compiled output
-/dist
-/tmp
+/dist/
+/tmp/
 
 # dependencies
-/node_modules
-/bower_components
+/bower_components/
+/node_modules/
 
 # misc
+/.env*
+/.pnp*
 /.sass-cache
+/.eslintcache
 /connect.lock
-/coverage/*
+/coverage/
 /libpeerconnection.log
-npm-debug.log*
-yarn-error.log
-testem.log
+/npm-debug.log*
+/testem.log
+/yarn-error.log
 
 # ember-try
-.node_modules.ember-try/
-bower.json.ember-try
-package.json.ember-try
+/.node_modules.ember-try/
+/bower.json.ember-try
+/package.json.ember-try

.npmignore

@@ -1,16 +1,36 @@
-/bower_components
+# compiled output
+/dist/
+/tmp/
+
+# dependencies
+/bower_components/
+
+# misc
+/.bowerrc
+/.editorconfig
+/.ember-cli
+/.env*
+/.eslintcache
+/.eslintignore
+/.eslintrc.js
+/.git/
+/.gitignore
+/.prettierignore
+/.prettierrc.js
+/.template-lintrc.js
+/.travis.yml
+/.watchmanconfig
+/bower.json
 /config/ember-try.js
-/dist
-/tests
-/tmp
-**/.gitkeep
-.bowerrc
-.editorconfig
-.ember-cli
-.gitignore
-.eslintrc.js
-.watchmanconfig
-.travis.yml
-bower.json
-ember-cli-build.js
-testem.js
+/CONTRIBUTING.md
+/ember-cli-build.js
+/testem.js
+/tests/
+/yarn-error.log
+/yarn.lock
+.gitkeep
+
+# ember-try
+/.node_modules.ember-try/
+/bower.json.ember-try
+/package.json.ember-try

.prettierignore

@@ -0,0 +1,21 @@
+# unconventional js
+/blueprints/*/files/
+/vendor/
+
+# compiled output
+/dist/
+/tmp/
+
+# dependencies
+/bower_components/
+/node_modules/
+
+# misc
+/coverage/
+!.*
+.eslintcache
+
+# ember-try
+/.node_modules.ember-try/
+/bower.json.ember-try
+/package.json.ember-try

.prettierrc.js

@@ -0,0 +1,5 @@
+'use strict';
+
+module.exports = {
+  singleQuote: true,
+};

.template-lintrc.js

@@ -0,0 +1,5 @@
+'use strict';
+
+module.exports = {
+  extends: 'recommended',
+};