WIP on ES6ification (v2)

.editorconfig

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+# See editorconfig.org
+root = true
+
+[*]
+charset = utf-8
+end_of_line = lf
+indent_size = 4
+indent_style = space
+insert_final_newline = true
+trim_trailing_whitespace = true

.eslintrc.json

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+{
+    "parser": "babel-eslint",
+    "extends": ["airbnb-base", "prettier"],
+    "env": {
+        "browser": true,
+        "es6": true
+    },
+    "rules": {
+        "no-const-assign": 1,
+        "no-shadow": 0,
+        "no-this-before-super": 1,
+        "no-undef": 1,
+        "no-unreachable": 1,
+        "no-unused-vars": 1,
+        "constructor-super": 1,
+        "valid-typeof": 1,
+        "indent": [2, 4, { "SwitchCase": 1 }],
+        "quotes": [2, "single", "avoid-escape"],
+        "semi": [2, "always"],
+        "eqeqeq": [2, "always"],
+        "one-var": [2, "never"],
+        "comma-dangle": [2, "always-multiline"],
+        "spaced-comment": [2, "always"],
+        "no-restricted-globals": 2,
+        "no-param-reassign": [2, { "props": false }]
+    },
+    "parserOptions": {
+        "sourceType": "module"
+    }
+}

.prettierrc

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+{
+    "useTabs": false,
+    "tabWidth": 4,
+    "singleQuote": true,
+    "trailingComma": "all"
+}

.stylelintrc.json

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+{
+    "extends": ["stylelint-config-recommended", "stylelint-config-prettier"],
+    "rules": {
+        "selector-class-pattern": null,
+        "selector-no-qualifying-type": [true, { "ignore": ["attribute", "class"] }],
+        "string-no-newline": null,
+        "indentation": 4,
+        "string-quotes": "single",
+        "max-nesting-depth": 2
+    }
+}

.vscode/extensions.json

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+{
+    // See http://go.microsoft.com/fwlink/?LinkId=827846
+    // for the documentation about the extensions.json format
+    "recommendations": [
+        // Extension identifier format: ${publisher}.${name}. Example: vscode.csharp
+        "dbaeumer.vscode-eslint",
+        "esbenp.prettier-vscode",
+        "shinnn.stylelint",
+        "wayou.vscode-todo-highlight"
+    ]
+}