Issue 3692 - Add base ESLint configuration

.eslintrc.json

+{
+  "extends": "eslint:recommended",
+  "env": {
+    "es6": true,
+    "browser": true

[Wladimir Palant, 2017/02/06 09:55:19]

This is wrong IMHO - this environment should be specified in the respective
projects. E.g. in Firefox we are currently running in a pure CommonJS
environment, no browser APIs available by default.

[kzar, 2017/02/06 10:00:27]

Done.

+  },
+  "rules": {
+    "array-bracket-spacing": "error",
+    "arrow-spacing": "error",
+    "block-scoped-var": "error",
+    "block-spacing": "error",
+    "brace-style": ["error", "allman", {"allowSingleLine": true}],
+    "camelcase": ["error", {"properties": "never"}],
+    "comma-dangle": "error",
+    "comma-spacing": "error",
+    "comma-style": "error",
+    "computed-property-spacing": "error",
+    "curly": ["error", "multi-or-nest", "consistent"],
+    "eol-last": "error",
+    "func-call-spacing": "error",
+    "indent": ["error", 2, {"SwitchCase": 1, "ArrayExpression": "first"}],
+    "key-spacing": "error",
+    "keyword-spacing": "error",
+    "linebreak-style": "error",
+    "lines-around-directive": "error",
+    "max-len": ["error", 80, {"ignoreUrls": true}],
+    "new-parens": "error",
+    "no-array-constructor": "error",
+    "no-caller": "error",
+    "no-catch-shadow": "error",
+    "no-cond-assign": "off",
+    "no-console": ["error", {"allow": ["warn", "error", "trace"]}],
+    "no-control-regex": "off",
+    "no-else-return": "error",
+    "no-eval": "error",
+    "no-extra-bind": "error",
+    "no-extra-label": "error",
+    "no-implied-eval": "error",
+    "no-labels": "error",
+    "no-lone-blocks": "error",
+    "no-lonely-if": "error",
+    "no-multi-spaces": "error",
+    "no-new-func": "error",
+    "no-new-object": "error",
+    "no-proto": "error",
+    "no-self-compare": "error",
+    "no-shadow": "error",
+    "no-trailing-spaces": "error",
+    "no-unneeded-ternary": "error",
+    "no-unused-vars": "off",
+    "no-useless-computed-key": "error",
+    "no-useless-concat": "error",
+    "no-useless-escape": "error",
+    "no-useless-return": "error",
+    "no-var": "error",
+    "no-warning-comments": "error",
+    "no-whitespace-before-property": "error",
+    "no-with": "error",
+    "object-curly-spacing": "error",
+    "object-shorthand": ["error", "always", {
+      "avoidExplicitReturnArrows": true
+    }],
+    "one-var": ["error", "never"],
+    "operator-assignment": "error",
+    "operator-linebreak": "error",
+    "padded-blocks": ["error", "never"],
+    "prefer-arrow-callback": "error",
+    "prefer-destructuring": ["error", {"array": false}],
+    "prefer-numeric-literals": "error",
+    "prefer-rest-params": "error",
+    "prefer-spread": "error",
+    "quote-props": ["error", "as-needed"],
+    "quotes": ["error", "double", {"avoidEscape": true}],
+    "radix": "error",
+    "rest-spread-spacing": "error",
+    "semi": "error",
+    "semi-spacing": "error",
+    "space-before-function-paren": ["error", "never"],
+    "space-in-parens": "error",
+    "space-infix-ops": "error",
+    "space-unary-ops": "error",
+    "spaced-comment": "error",
+    "strict": ["error", "global"],
+    "valid-jsdoc": ["error", {
+      "requireParamDescription": false,
+      "requireReturn": false,
+      "requireReturnDescription": false
+    }],
+    "yield-star-spacing": "error",
+    "yoda": "error"
+  }
+}