.eslintrc.json

{
  "env": {
    "browser": true,
    "es6": true,
    "node": true,
    "mocha": true
  },
  "extends": "eslint:recommended",
  "parserOptions": {
    "ecmaVersion": 2020,
    "sourceType": "module"
  },
  "globals": {
    "BigInt": true,
    "Metacom": true
  },
  "rules": {
    "no-debugger": "warn",
    "indent": ["warn", 4],
    "linebreak-style": ["error", "unix"],
    "quotes": ["error", "single"],
    "semi": ["error", "always", {
      "omitLastInOneLineBlock": true
    }],
    "no-unused-vars": ["warn", {
      "vars": "all",
      "varsIgnorePattern": "^_.*"
    }],
    "no-loop-func": ["error"],
    "strict": ["error", "global"],
    "brace-style": ["error", "1tbs", {
      "allowSingleLine": true
    }],
    "key-spacing": ["error", {
      "mode": "minimum"
    }],
    "max-len": ["error", {
      "code": 120,
      "ignoreUrls": true
    }],
    "no-lonely-if": ["error"],
    "no-trailing-spaces": ["error"],
    "no-unneeded-ternary": ["error"],
    "no-whitespace-before-property": ["error"],
    "operator-linebreak": ["error", "after"],
    "space-before-function-paren": ["error", {
      "anonymous": "never",
      "named": "never",
      "asyncArrow": "always"
    }],
    "space-unary-ops": ["error", {
      "words": true,
      "nonwords": false,
      "overrides": {
        "typeof": false
      }
    }],
    "no-constant-condition": ["error", {
      "checkLoops": false
    }],
    "no-console": ["off"],
    "arrow-body-style": ["error", "always"],
    "arrow-spacing": ["error", {
      "before": true,
      "after": true
    }],
    "no-confusing-arrow": ["error"],
    "no-useless-computed-key": ["error"],
    "no-useless-rename": ["error"],
    "no-var": ["error"],
    "object-shorthand": ["error", "always"],
    "prefer-arrow-callback": ["error"],
    "prefer-numeric-literals": ["error"],
    "prefer-rest-params": ["error"],
    "prefer-spread": ["error"],
    "rest-spread-spacing": ["error", "never"],
    "template-curly-spacing": ["error", "never"],
    "require-await": ["warn"]
  }
}