Linting and code formatting (#321)

* added prettier and changed indent

* added stylelint

* added pre-commit

* Improvements

* Merge remote-tracking branch 'upstream/master' into Linting-and-formatting

* Temporarily disable pre-commit hook to allow rebase

* Re-enable pre-commit hook after merge

* Lint merged files

* Add comma-dangle multiline rule

Co-authored-by: Olga Bulat <obulat@gmail.com>

Author: rohan-goel

.editorconfig

@@ -3,7 +3,8 @@ root = true
 [*]
 charset = utf-8
 indent_style = space
-indent_size = 4
+indent_size = 2
 end_of_line = lf
 insert_final_newline = true
 trim_trailing_whitespace = true
+

.eslintrc.js

@@ -1,33 +1,43 @@
 module.exports = {
-    root: true,
-    env: {
-        node: true
+  root: true,
+
+  env: {
+    node: true,
+    browser: true,
+  },
+
+  rules: {
+    'no-console': process.env.NODE_ENV === 'production' ? 'warn' : 'off',
+    'no-debugger': process.env.NODE_ENV === 'production' ? 'warn' : 'off',
+    indent: ['error', 2],
+    'comma-dangle': ["error", "always-multiline"],
+    'space-before-function-paren': ['warn', 'never'],
+    'vue/require-default-prop': 'off',
+    'vue/no-v-html': 'off',
+    'vue/html-indent': ['error', 2],
+  },
+
+  parserOptions: {
+    parser: 'babel-eslint',
+  },
+
+  overrides: [
+
+    {
+      files: [
+        '**/__tests__/*.{j,t}s?(x)',
+        '**/tests/unit/**/*.spec.{j,t}s?(x)',
+      ],
+      env: {
+        jest: true,
+      },
     },
-    extends: [
-        'plugin:vue/recommended',
-        '@vue/standard'
-    ],
-    rules: {
-        'no-console': process.env.NODE_ENV === 'production' ? 'error' : 'off',
-        'no-debugger': process.env.NODE_ENV === 'production' ? 'error' : 'off',
-        indent: ['error', 4],
-        'space-before-function-paren': ['warn', 'never'],
-        'vue/require-default-prop': 'off',
-        'vue/no-v-html': 'off',
-        'vue/html-indent': ['error', 4]
-    },
-    parserOptions: {
-        parser: 'babel-eslint'
-    },
-    overrides: [
-        {
-            files: [
-                '**/__tests__/*.{j,t}s?(x)',
-                '**/tests/unit/**/*.spec.{j,t}s?(x)'
-            ],
-            env: {
-                jest: true
-            }
-        }
-    ]
+  ],
+
+  extends: [
+    'plugin:vue/recommended',
+    '@vue/standard',
+    'prettier',
+    'prettier/vue',
+  ],
 }