.eslintrc.json

{
  "root": true,
  "env": {
    "browser": true,
    "commonjs": true,
    "es6": true,
    "node": true,
    "mocha": true
  },
  "parserOptions": {"ecmaVersion": 8, "sourceType": "module"},
  "extends": ["eslint:recommended"],
  "rules": {
    "array-bracket-spacing": ["warn", "never"],
    "arrow-body-style": ["warn", "as-needed"],
    "arrow-parens": ["warn", "as-needed"],
    "arrow-spacing": "warn",
    "brace-style": "off",
    "camelcase": "warn",
    "comma-spacing": ["warn", {"after": true}],
    "comma-dangle": ["warn", "only-multiline"],
    "dot-notation": "warn",
    "func-call-spacing": ["warn", "never"],
    "indent": ["warn", 2, {
      "SwitchCase": 1,
      "FunctionDeclaration": {"parameters": 1},
      "MemberExpression": 1,
      "CallExpression": {"arguments": 1}
    }],
    "key-spacing": ["warn", {"beforeColon": false, "afterColon": true, "mode": "minimum"}],
    "keyword-spacing": "warn",
    "linebreak-style": ["warn", "unix"],
    "lines-around-directive": ["warn", { "before": "never", "after": "always"}],
    "max-len": ["off", {"code": 120, "tabWidth": 2, "ignoreTrailingComments": true, "ignoreTemplateLiterals": true}],
    "no-console": "off",
    "no-constant-condition": "off",
    "no-else-return": "warn",
    "no-empty": "off",
    "no-extra-bind": "warn",
    "no-floating-decimal": "warn",
    "no-multi-spaces": ["warn", {"ignoreEOLComments": true}],
    "no-multiple-empty-lines": ["warn", {"max": 2, "maxBOF": 0, "maxEOF": 0}],
    "no-redeclare": "off",
    "no-restricted-globals": ["warn"],
    "no-trailing-spaces": "warn",
    "no-undef": "error",
    "no-unused-vars": ["warn", {"args": "none"}],
    "no-useless-return": "error",
    "no-var": "warn",
    "no-whitespace-before-property": "warn",
    "object-curly-spacing": ["warn", "never"],
    "prefer-const": "warn",
    "quotes": ["warn", "single"],
    "quote-props": ["warn", "as-needed"],
    "require-await": "warn",
    "semi": ["warn", "always"],
    "semi-spacing": "warn",
    "space-before-blocks": ["warn", "always"],
    "space-before-function-paren": ["warn", {
      "anonymous": "never",
      "named": "never",
      "asyncArrow": "always"
    }],

    "space-in-parens": ["warn", "never"],
    "strict": "warn"
  }
}