.eslintrc

{
  "env": {
    "es6": true,
    "node": true,
    "mocha": true
  },
  "parserOptions": {
    "ecmaVersion": 9,
    "sourceType": "module"
  },
  "extends": [
    "eslint:recommended"
  ],
  "rules": {
    "eqeqeq": ["error", "smart"],
    "no-else-return": "error",
    "no-fallthrough": 0,
    "no-multi-spaces": "error",
    "no-implicit-coercion": "error",
    "no-return-assign": "error",
    "no-self-compare": "error",
    "no-useless-return": "error",
    "yoda": "error",
    "no-param-reassign": "error",
    "no-shadow": "error",
    "no-shadow-restricted-names": "error",
    "no-use-before-define": "error",
    "array-bracket-spacing": ["error", "never"],
    "block-spacing": "error",
    "brace-style": ["error", "1tbs", { "allowSingleLine": true }],
    "camelcase": "error",
    "capitalized-comments": "error",
    "comma-dangle": ["error", "never"],
    "comma-spacing": ["error", { "before": false, "after": true }],
    "comma-style": ["error", "last"],
    "computed-property-spacing": ["error", "never"],
    "eol-last": ["error", "always"],
    "func-call-spacing": ["error", "never"],
    "func-style": ["error", "expression"],
    "indent": ["error", 2, { "SwitchCase": 1 }],
    "jsx-quotes": ["error", "prefer-single"],
    "key-spacing": ["error", { "mode": "strict", "beforeColon": false, "afterColon": true }],
    "keyword-spacing": ["error", { "before": true, "after": true }],
    "lines-around-comment": ["error", {
      "beforeBlockComment": true,
      "afterBlockComment": false,
      "beforeLineComment": true,
      "afterLineComment": false,
      "allowBlockStart": true
    }],
    "max-depth": ["error", 3],
    "max-lines": ["error", 150],
    "max-params": ["error", 3],
    "max-statements-per-line": ["error", { "max": 1 }],
    "max-statements": ["error", 15],
    "new-cap": "error",
    "new-parens": "error",
    "no-lonely-if": "error",
    "no-multi-assign": "error",
    "no-multiple-empty-lines": ["error", { "max": 1, "maxEOF": 1 }],
    "no-nested-ternary": "error",
    "no-trailing-spaces": "error",
    "no-unneeded-ternary": "error",
    "no-var": "error",
    "no-whitespace-before-property": "error",
    "object-curly-spacing": ["error", "always"],
    "one-var-declaration-per-line": ["error", "always"],
    "one-var": ["error", "never"],
    "operator-linebreak": ["error", "none"],
    "padded-blocks": ["error", "never"],
    "quote-props": ["error", "consistent-as-needed"],
    "quotes": ["error", "single", { "allowTemplateLiterals": true }],
    "semi-spacing": "error",
    "semi": ["error", "always"],
    "space-before-blocks": "error",
    "space-before-function-paren": ["error", {
      "anonymous": "always",
      "named": "never",
      "asyncArrow": "ignore"
    }],
    "space-in-parens": ["error", "never"],
    "space-infix-ops": "error",
    "space-unary-ops": ["error", {
      "words": true,
      "nonwords": false
    }],
    "spaced-comment": ["error", "always"],
    "no-duplicate-imports": "error",
    "no-useless-constructor": "error",
    "prefer-const": "error",
    "prefer-template": "error",
    "template-curly-spacing": "error",
    "no-console": 0
  }
}