.eslintrc.json

{
  "env": {
    "browser": true,
    "node": true,
    "es6": true
  },
  "extends": ["eslint:recommended"],
  "ignorePatterns": ["**/*.ejs"],
  "parserOptions": {
    "ecmaVersion": "latest",
    "sourceType": "module"
  },
  "root": true,
  "rules": {
    "array-bracket-newline": ["warn", { "multiline": true }],
    "arrow-body-style": ["warn", "as-needed"],
    "arrow-parens": "warn",
    "arrow-spacing": "warn",
    "block-spacing": "warn",
    "brace-style": ["warn", "1tbs", { "allowSingleLine": true }],
    "camelcase": "warn",
    "comma-dangle": ["warn", "never"],
    "comma-spacing": "warn",
    "comma-style": "warn",
    "curly": ["warn", "all"],
    "dot-location": ["warn", "property"],
    "dot-notation": "warn",
    "eol-last": "warn",
    "implicit-arrow-linebreak": "warn",
    "indent": ["warn", 2, { "SwitchCase": 1 }],
    "key-spacing": "warn",
    "keyword-spacing": "warn",
    "no-extra-parens": "warn",
    "no-multi-spaces": "warn",
    "no-multiple-empty-lines": ["warn", { "max": 2, "maxEOF": 0 }],
    "no-trailing-spaces": "warn",
    "no-unused-vars": ["warn", { "ignoreRestSiblings": true }],
    "no-whitespace-before-property": "warn",
    "object-curly-newline": ["warn", { "multiline": true }],
    "object-curly-spacing": ["warn", "always"],
    "quotes": ["warn", "single"],
    "semi": ["warn", "never"],
    "space-before-blocks": "warn",
    "space-before-function-paren": ["warn", { "anonymous": "never", "named": "never", "asyncArrow": "always" }],
    "switch-colon-spacing": "warn"
  }
}