.eslintrc.json

{
  "env": {
    "browser": true,
    "es2021": true,
    "jest": true
  },
  "extends": [
    "react-app",
    "react-app/jest",
    "plugin:react/recommended",
    "standard-with-typescript",
    "plugin:prettier/recommended"
  ],
  "overrides": [],
  "parser": "@typescript-eslint/parser",
  "parserOptions": {
    "ecmaFeatures": {
      "jsx": true
    },
    "ecmaVersion": "latest",
    "sourceType": "module",
    "project": [
      "./tsconfig.json"
    ]
  },
  "plugins": [
    "react",
    "prettier",
    "@typescript-eslint"
  ],
  "rules": {
    "@typescript-eslint/strict-boolean-expressions": "off",
    // Limit Cyclomatic Complexity
    "complexity": [
      "error",
      20
    ],
    // Enforce a maximum depth that blocks can be nested
    "max-depth": [
      "error",
      4
    ],
    // Enforce a maximum file length
    "max-lines": [
      "warn",
      {
        "max": 300,
        "skipBlankLines": true,
        "skipComments": true
      }
    ],
    // Enforce a maximum function length
    "max-lines-per-function": [
      "warn",
      {
        "max": 150,
        "skipBlankLines": true,
        "skipComments": true,
        "IIFEs": true
      }
    ],
    // Enforce a maximum depth that callbacks can be nested
    "max-nested-callbacks": [
      "error",
      3
    ],
    // Enforce a maximum number of parameters in function definitions
    "max-params": [
      "error",
      3
    ],
    // Enforce a maximum number of statements allowed per line
    "max-statements": [
      "error",
      20
    ],
    // 15
    "no-param-reassign": 0,
    "import/order": [
      "error",
      {
        "groups": [
          "builtin",
          "external",
          "internal",
          "unknown",
          "parent",
          "sibling",
          "index"
        ],
        "pathGroups": [
          {
            "pattern": "{react**,react/**}",
            "group": "builtin",
            "position": "before"
          }
        ],
        // sort the order within each group in alphabetical manner based on import path
        "alphabetize": {
          "order": "asc",
          "caseInsensitive": true
        },
        // defines import types that are not handled by configured pathGroups
        "pathGroupsExcludedImportTypes": [
          "react"
        ],
        "newlines-between": "always"
      }
    ],
    "sort-imports": [
      "error",
      {
        // case-sensitivity of the imports local name: B > a
        "ignoreCase": true,
        // sort ascending, base on variable name: a > b
        "ignoreDeclarationSort": true
      }
    ],
    "import/extensions": [
      "error",
      "ignorePackages",
      {
        "": "never"
      }
    ],
    "no-unused-vars": "off",
    "@typescript-eslint/no-unused-vars": "warn",
    "@typescript-eslint/no-misused-promises": "off",
    "@typescript-eslint/explicit-function-return-type": "off",
    "@typescript-eslint/explicit-module-boundary-types": "error"
  }
}