reset using ember-cli-update --to 2.18 --reset

.eslintrc.js

@@ -4,10 +4,54 @@ module.exports = {
     ecmaVersion: 2017,
     sourceType: 'module'
   },
-  extends: 'eslint:recommended',
+  plugins: [
+    'ember'
+  ],
+  extends: [
+    'eslint:recommended',
+    'plugin:ember/recommended'
+  ],
   env: {
     browser: true
   },
   rules: {
-  }
+  },
+  overrides: [
+    // node files
+    {
+      files: [
+        'index.js',
+        'testem.js',
+        'ember-cli-build.js',
+        'config/**/*.js',
+        'tests/dummy/config/**/*.js'
+      ],
+      excludedFiles: [
+        'app/**',
+        'addon/**',
+        'tests/dummy/app/**'
+      ],
+      parserOptions: {
+        sourceType: 'script',
+        ecmaVersion: 2015
+      },
+      env: {
+        browser: false,
+        node: true
+      },
+      plugins: ['node'],
+      rules: Object.assign({}, require('eslint-plugin-node').configs.recommended.rules, {
+        // add your custom rules and overrides for node files here
+      })
+    },
+
+    // test files
+    {
+      files: ['tests/**/*.js'],
+      excludedFiles: ['tests/dummy/**/*.js'],
+      env: {
+        embertest: true
+      }
+    }
+  ]
 };

.github/workflows/ci.yml

@@ -22,8 +22,9 @@ jobs:
       - uses: actions/setup-node@v2
         with:
           node-version: ${{ env.NODE_VERSION }}
-      - run: yarn
-      - run: yarn lint:js
+      - run: npm i -g npm@6
+      - run: npm ci
+      - run: npm run lint:js
 
   test:
     name: Tests
@@ -34,8 +35,9 @@ jobs:
       - uses: actions/setup-node@v2
         with:
           node-version: ${{ env.NODE_VERSION }}
-      - run: yarn --ignore-engines
-      - run: yarn test:ember
+      - run: npm i -g npm@6
+      - run: npm ci
+      - run: npm run test:ember
 
   floating-dependencies:
     name: Floating Dependencies
@@ -46,8 +48,9 @@ jobs:
       - uses: actions/setup-node@v2
         with:
           node-version: ${{ env.NODE_VERSION }}
-      - run: yarn --no-lockfile --ignore-engines
-      - run: yarn test:ember
+      - run: npm i -g npm@6
+      - run: npm install --no-package-lock
+      - run: npm run test:ember
 
   try-scenarios:
     name: "ember-try: ${{ matrix.ember-try-scenario }}"
@@ -61,6 +64,8 @@ jobs:
         ember-try-scenario:
           - ember-lts-2.4
           - ember-lts-2.8
+          - ember-lts-2.12
+          - ember-lts-2.16
           - ember-release
           - ember-canary
 
@@ -69,6 +74,7 @@ jobs:
       - uses: actions/setup-node@v2
         with:
           node-version: ${{ env.NODE_VERSION }}
-      - run: yarn --ignore-engines
+      - run: npm i -g npm@6
+      - run: npm ci
       - name: test
         run: node_modules/.bin/ember try:one ${{ matrix.ember-try-scenario }} --skip-cleanup

.gitignore

@@ -14,4 +14,10 @@
 /coverage/*
 /libpeerconnection.log
 npm-debug.log*
+yarn-error.log
 testem.log
+
+# ember-try
+.node_modules.ember-try/
+bower.json.ember-try
+package.json.ember-try

.npmignore

@@ -7,10 +7,15 @@
 .bowerrc
 .editorconfig
 .ember-cli
-.gitignore
 .eslintrc.js
+.gitignore
 .watchmanconfig
 .travis.yml
 bower.json
 ember-cli-build.js
 testem.js
+
+# ember-try
+.node_modules.ember-try/
+bower.json.ember-try
+package.json.ember-try

LICENSE.md

@@ -1,6 +1,6 @@
 The MIT License (MIT)
 
-Copyright (c) 2015
+Copyright (c) 2021
 
 Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
 

README.md

@@ -1,6 +1,5 @@
-# Ember CLI Showdown
+# ember-cli-showdown
 
-[![Build Status](https://travis-ci.org/gcollazo/ember-cli-showdown.svg?branch=master)](https://travis-ci.org/gcollazo/ember-cli-showdown)
 [![Ember Observer Score](http://emberobserver.com/badges/ember-cli-showdown.svg)](http://emberobserver.com/addons/ember-cli-showdown)
 
 This addon provides a component that transforms [Markdown](http://en.wikipedia.org/wiki/Markdown) into valid HTML.
@@ -120,21 +119,23 @@ export default {
 
 ## Development
 
-* `git clone https://github.com/gcollazo/ember-cli-showdown.git`
+* `git clone git@github.com:ember-cli/ember-addon-output.git` this repository
 * `cd ember-cli-showdown`
 * `npm install`
-* `bower install`
 
-## Previewing
+## Running
 
-* `ember server`
-* Visit your app at http://localhost:4200.
+* `ember serve`
+* Visit your app at [http://localhost:4200](http://localhost:4200).
 
 ## Running Tests
 
+* `npm test` (Runs `ember try:each` to test your addon against multiple Ember versions)
 * `ember test`
 * `ember test --server`
 
 ## Building
 
 * `ember build`
+
+For more information on using ember-cli, visit [https://ember-cli.com/](https://ember-cli.com/).

config/ember-try.js

@@ -1,4 +1,3 @@
-/* eslint-env node */
 module.exports = {
   scenarios: [
     {
@@ -33,6 +32,22 @@ module.exports = {
         }
       }
     },
+    {
+      name: 'ember-lts-2.12',
+      npm: {
+        devDependencies: {
+          'ember-source': '~2.12.0'
+        }
+      }
+    },
+    {
+      name: 'ember-lts-2.16',
+      npm: {
+        devDependencies: {
+          'ember-source': '~2.16.0'
+        }
+      }
+    },
     {
       name: 'ember-release',
       bower: {
@@ -80,12 +95,6 @@ module.exports = {
           'ember-source': null
         }
       }
-    },
-    {
-      name: 'ember-default',
-      npm: {
-        devDependencies: {}
-      }
     }
   ]
 };

config/environment.js

@@ -1,4 +1,3 @@
-/* eslint-env node */
 'use strict';
 
 module.exports = function(/* environment, appConfig */) {

ember-cli-build.js

@@ -1,8 +1,9 @@
-/* eslint-env node */
+'use strict';
+
 const EmberAddon = require('ember-cli/lib/broccoli/ember-addon');
 
 module.exports = function(defaults) {
-  var app = new EmberAddon(defaults, {
+  let app = new EmberAddon(defaults, {
     // Add options here
   });
 

index.js

@@ -1,4 +1,3 @@
-/* eslint-env node */
 'use strict';
 
 const path = require('path');