fix(scripts): Set defaults for getValFromTrailingCommaConfig missings keys in objectConfig (#74)

Closes #48

Author: sirpeas

.all-contributorsrc

@@ -160,6 +160,17 @@
         "doc",
         "code"
       ]
+    },
+    {
+      "login": "Belir",
+      "name": "Patryk Peas",
+      "avatar_url": "https://avatars0.githubusercontent.com/u/4818642?v=3",
+      "profile": "https://github.com/Belir",
+      "contributions": [
+        "bug",
+        "code",
+        "test"
+      ]
     }
   ]
 }

README.md

@@ -9,7 +9,7 @@ Formats your JavaScript using [`prettier`][prettier] followed by [`eslint --fix`
 [![downloads][downloads-badge]][npm-stat]
 [![MIT License][license-badge]][LICENSE]
 
-[![All Contributors](https://img.shields.io/badge/all_contributors-16-orange.svg?style=flat-square)](#contributors)
+[![All Contributors](https://img.shields.io/badge/all_contributors-17-orange.svg?style=flat-square)](#contributors)
 [![PRs Welcome][prs-badge]][prs]
 [![Donate][donate-badge]][donate]
 [![Code of Conduct][coc-badge]][coc]
@@ -223,7 +223,7 @@ Thanks goes to these people ([emoji key][emojis]):
 | [<img src="https://avatars.githubusercontent.com/u/1500684?v=3" width="100px;"/><br /><sub>Kent C. Dodds</sub>](https://kentcdodds.com)<br />[💻](https://github.com/prettier/prettier-eslint/commits?author=kentcdodds) [📖](https://github.com/prettier/prettier-eslint/commits?author=kentcdodds) 🚇 [⚠️](https://github.com/prettier/prettier-eslint/commits?author=kentcdodds) | [<img src="https://avatars.githubusercontent.com/u/5554486?v=3" width="100px;"/><br /><sub>Gyandeep Singh</sub>](http://gyandeeps.com)<br />👀 | [<img src="https://avatars.githubusercontent.com/u/682584?v=3" width="100px;"/><br /><sub>Igor Pnev</sub>](https://github.com/exdeniz)<br />[🐛](https://github.com/prettier/prettier-eslint/issues?q=author%3Aexdeniz) | [<img src="https://avatars.githubusercontent.com/u/813865?v=3" width="100px;"/><br /><sub>Benjamin Tan</sub>](https://demoneaux.github.io/)<br />💬 👀 | [<img src="https://avatars.githubusercontent.com/u/622118?v=3" width="100px;"/><br /><sub>Eric McCormick</sub>](https://ericmccormick.io)<br />[💻](https://github.com/prettier/prettier-eslint/commits?author=edm00se) [📖](https://github.com/prettier/prettier-eslint/commits?author=edm00se) [⚠️](https://github.com/prettier/prettier-eslint/commits?author=edm00se) | [<img src="https://avatars.githubusercontent.com/u/2142817?v=3" width="100px;"/><br /><sub>Simon Lydell</sub>](https://github.com/lydell)<br />[📖](https://github.com/prettier/prettier-eslint/commits?author=lydell) | [<img src="https://avatars0.githubusercontent.com/u/981957?v=3" width="100px;"/><br /><sub>Tom McKearney</sub>](https://github.com/tommck)<br />[📖](https://github.com/prettier/prettier-eslint/commits?author=tommck) 💡 |
 | :---: | :---: | :---: | :---: | :---: | :---: | :---: |
 | [<img src="https://avatars.githubusercontent.com/u/463105?v=3" width="100px;"/><br /><sub>Patrik Åkerstrand</sub>](https://github.com/PAkerstrand)<br />[💻](https://github.com/prettier/prettier-eslint/commits?author=PAkerstrand) | [<img src="https://avatars.githubusercontent.com/u/1560301?v=3" width="100px;"/><br /><sub>Lochlan Bunn</sub>](https://twitter.com/loklaan)<br />[💻](https://github.com/prettier/prettier-eslint/commits?author=loklaan) | [<img src="https://avatars.githubusercontent.com/u/25886902?v=3" width="100px;"/><br /><sub>Daniël Terwiel</sub>](https://github.com/danielterwiel)<br />🔌 🔧 | [<img src="https://avatars1.githubusercontent.com/u/1834413?v=3" width="100px;"/><br /><sub>Robin Malfait</sub>](https://robinmalfait.com)<br />🔧 | [<img src="https://avatars0.githubusercontent.com/u/8161781?v=3" width="100px;"/><br /><sub>Michael McDermott</sub>](http://mgmcdermott.com)<br />[💻](https://github.com/prettier/prettier-eslint/commits?author=mgmcdermott) | [<img src="https://avatars3.githubusercontent.com/u/292365?v=3" width="100px;"/><br /><sub>Adam Stankiewicz</sub>](http://sheerun.net)<br />[💻](https://github.com/prettier/prettier-eslint/commits?author=sheerun) | [<img src="https://avatars3.githubusercontent.com/u/487068?v=3" width="100px;"/><br /><sub>Stephen John Sorensen</sub>](http://www.stephenjohnsorensen.com/)<br />[💻](https://github.com/prettier/prettier-eslint/commits?author=spudly) |
-| [<img src="https://avatars2.githubusercontent.com/u/1597820?v=3" width="100px;"/><br /><sub>Brian Di Palma</sub>](https://github.com/briandipalma)<br />[🐛](https://github.com/prettier/prettier-eslint/issues?q=author%3Abriandipalma) [💻](https://github.com/prettier/prettier-eslint/commits?author=briandipalma) | [<img src="https://avatars0.githubusercontent.com/u/6173488?v=3" width="100px;"/><br /><sub>Rob Wise</sub>](https://robwise.github.io)<br />[📖](https://github.com/prettier/prettier-eslint/commits?author=robwise) [💻](https://github.com/prettier/prettier-eslint/commits?author=robwise) |
+| [<img src="https://avatars2.githubusercontent.com/u/1597820?v=3" width="100px;"/><br /><sub>Brian Di Palma</sub>](https://github.com/briandipalma)<br />[🐛](https://github.com/prettier/prettier-eslint/issues?q=author%3Abriandipalma) [💻](https://github.com/prettier/prettier-eslint/commits?author=briandipalma) | [<img src="https://avatars0.githubusercontent.com/u/6173488?v=3" width="100px;"/><br /><sub>Rob Wise</sub>](https://robwise.github.io)<br />[📖](https://github.com/prettier/prettier-eslint/commits?author=robwise) [💻](https://github.com/prettier/prettier-eslint/commits?author=robwise) | [<img src="https://avatars0.githubusercontent.com/u/4818642?v=3" width="100px;"/><br /><sub>Patryk Peas</sub>](https://github.com/Belir)<br />[🐛](https://github.com/prettier/prettier-eslint/issues?q=author%3ABelir) [💻](https://github.com/prettier/prettier-eslint/commits?author=Belir) [⚠️](https://github.com/prettier/prettier-eslint/commits?author=Belir) |
 <!-- ALL-CONTRIBUTORS-LIST:END -->
 
 This project follows the [all-contributors][all-contributors] specification. Contributions of any kind welcome!

src/utils.js

@@ -214,7 +214,7 @@ function getTrailingComma(value, fallbacks, rules) {
 }
 
 function getValFromTrailingCommaConfig(objectConfig) {
-  const [, {arrays, objects, functions}] = objectConfig
+  const [, {arrays = '', objects = '', functions = ''}] = objectConfig
   const fns = isAlways(functions)
   const es5 = [arrays, objects].some(isAlways)
 

src/utils.test.js

@@ -168,6 +168,18 @@ const getPrettierOptionsFromESLintRulesTests = [
   },
   {rules: {'max-len': ['error', {code: 120}]}, options: {printWidth: 120}},
   {rules: {quotes: [2, 'double']}, options: {singleQuote: false}},
+  {
+    rules: {
+      'comma-dangle': [
+        2,
+        {
+          imports: 'never',
+          exports: 'never',
+        },
+      ],
+    },
+    options: {trailingComma: 'none'},
+  },
 
   // If an ESLint rule is disabled fall back to prettier defaults.
   {rules: {'max-len': [0, {code: 120}]}, options: {}},