Use overrides for better multi-file-format control of prettier

.prettierrc.js

@@ -1,8 +1,15 @@
 'use strict';
 
 module.exports = {
-  singleQuote: true,
-  trailingComma: 'es5',
   printWidth: 120,
-  arrowParens: 'avoid',
+  overrides: [
+    {
+      files: '*{js,ts}',
+      options: {
+        trailingComma: 'es5',
+        arrowParens: 'avoid',
+        singleQuote: true,
+      },
+    },
+  ],
 };

test-packages/sample-transforms/.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
-  - '8'
+  - "8"
 
 sudo: false
 dist: trusty
@@ -33,22 +33,22 @@ jobs:
   include:
     # runs linting and tests with current locked deps
 
-    - stage: 'Tests'
-      name: 'Tests'
+    - stage: "Tests"
+      name: "Tests"
       install:
         - yarn install --non-interactive
       script:
         - yarn lint:hbs
         - yarn lint:js
         - yarn test
 
-    - name: 'Floating Dependencies'
+    - name: "Floating Dependencies"
       script:
         - yarn test
 
     # we recommend new addons test the current and previous LTS
     # as well as latest stable release (bonus points to beta/canary)
-    - stage: 'Additional Tests'
+    - stage: "Additional Tests"
       env: EMBER_TRY_SCENARIO=ember-lts-2.18
     - env: EMBER_TRY_SCENARIO=ember-lts-3.4
     - env: EMBER_TRY_SCENARIO=ember-release

test-packages/sample-transforms/tests/dummy/app/templates/application.hbs

@@ -1,3 +1,3 @@
-<h2 id='title'>Welcome to Ember</h2>
+<h2 id="title">Welcome to Ember</h2>
 
 {{outlet}}

tests/addon-template/.prettierrc.js

@@ -1,5 +1,12 @@
 'use strict';
 
 module.exports = {
-  singleQuote: true,
+  overrides: [
+    {
+      files: '*{js,ts}',
+      options: {
+        singleQuote: true,
+      },
+    },
+  ],
 };

tests/addon-template/tests/dummy/app/templates/application.hbs

@@ -1,5 +1,5 @@
-{{page-title 'Dummy'}}
+{{page-title "Dummy"}}
 
-<h2 id='title'>Welcome to Ember</h2>
+<h2 id="title">Welcome to Ember</h2>
 
 {{outlet}}

tests/app-template/.prettierrc.js

@@ -0,0 +1,12 @@
+'use strict';
+
+module.exports = {
+  overrides: [
+    {
+      files: '*{js,ts}',
+      options: {
+        singleQuote: true,
+      },
+    },
+  ],
+};

tests/app-template/config/targets.js

@@ -1,6 +1,10 @@
 'use strict';
 
-const browsers = ['last 1 Chrome versions', 'last 1 Firefox versions', 'last 1 Safari versions'];
+const browsers = [
+  'last 1 Chrome versions',
+  'last 1 Firefox versions',
+  'last 1 Safari versions',
+];
 
 module.exports = {
   browsers,

tests/ts-app-template/app/templates/application.hbs

@@ -1,3 +1,3 @@
-{{page-title 'TsAppTemplate'}}
+{{page-title "TsAppTemplate"}}
 
 {{outlet}}