.eslintrc.json

{
  "env": {
    "browser": true,
    "jquery": true,
    "es2021": true
  },
  "parserOptions": {
    "ecmaVersion": 12
  },
  "extends": ["prettier"],
  "plugins": ["prettier"],
  "rules": {
    // Formatting
    "prettier/prettier": "error",

    // Syntax and logic errors
    "for-direction": "error",
    "getter-return": "error",
    "no-async-promise-executor": "error",
    "no-constant-condition": "error",
    "no-control-regex": "error",
    "no-debugger": "error",
    "no-dupe-args": "error",
    "no-dupe-else-if": "error",
    "no-dupe-keys": "error",
    "no-duplicate-case": "error",
    "no-empty": "error",
    "no-empty-character-class": "error",
    "no-ex-assign": "error",
    "no-extra-boolean-cast": "error",
    "no-extra-semi": "error",
    "no-func-assign": "error",
    "no-import-assign": "error",
    "no-inner-declarations": "error",
    "no-invalid-regexp": "error",
    "no-irregular-whitespace": "error",
    "no-misleading-character-class": "error",
    "no-obj-calls": "error",
    "no-prototype-builtins": "error",
    "no-regex-spaces": "error",
    "no-setter-return": "error",
    "no-sparse-arrays": "error",
    "no-unexpected-multiline": "error",
    "no-unreachable": "error",
    "no-unsafe-finally": "error",
    "no-unsafe-negation": "error",
    "use-isnan": "error",
    "valid-typeof": "error",

    // Additional rules we find useful
    "prefer-const": "error"
  }
}