.eslintrc

{
  "env": {
    "browser": true,
    "es6": true,
    "jest": true
  },
  "extends": "eslint:recommended",
  "parserOptions": {
    "ecmaVersion": 2020,
    "sourceType": "module"
  },
  "rules": {
    "no-debugger": "error",
    "no-dupe-keys": "warn",
    "no-dupe-args": "warn",
    "no-duplicate-case": "warn",
    "no-empty": "warn",
    "no-extra-semi": "warn",
    "no-func-assign": "warn",
    "no-obj-calls": "warn",
    "no-sparse-arrays": "warn",
    "no-unreachable": "warn",
    "valid-typeof": "warn",
    "no-multi-spaces": "warn",
    "no-with": "warn",
    "curly": "warn",
    "no-unused-expressions": "warn",
    "no-shadow-restricted-names": "warn",
    "no-undefined": "off",
    "camelcase": "warn",

    "indent": ["warn", 2, {
      "MemberExpression": "off"
    }],

    "array-bracket-spacing": ["warn", "never"],
    "comma-spacing": "warn",
    "comma-style": "warn",
    "computed-property-spacing": "warn",
    "func-call-spacing": "warn",
    "key-spacing": "warn",
    "keyword-spacing": "warn",
    "new-cap": "warn",
    "no-mixed-spaces-and-tabs": "warn",
    "one-var": ["warn", {
      "var": "never",
      "let": "never",
      "const": "never"
    }],
    "semi": "warn",
    "space-in-parens": ["warn", "never"],
    "space-before-blocks": "warn",
    "unicode-bom": "warn",
    "new-parens": "warn",
    "no-nested-ternary": "warn",
    "space-infix-ops": "warn",
    "space-unary-ops": ["warn", {
      "words": true,
      "nonwords": false
    }],

    // ES2015
    "constructor-super": "warn",
    "no-this-before-super": "warn",
    "no-var": "warn"
  }
}