.eslintrc

{
  "env": {
    "browser": true,
    "es6": true,
    "node": true,
    "jest": true
  },
  "parserOptions": {
    "ecmaFeatures": {
      "jsx": true
    },
    "ecmaVersion": 2019,
    "sourceType": "module"
  },
  "globals": {
    "Atomics": "readonly",
    "SharedArrayBuffer": "readonly"
  },
  "plugins": ["react", "react-hooks", "jsx-a11y", "prettier", "jest"],
  "extends": [
    "plugin:react/recommended",
    "airbnb",
    "prettier",
    "plugin:jest/recommended",
    "plugin:jest/style",
    // Keep it last
    "plugin:prettier/recommended"
  ],
  // Docs: off=0, warn=1, error=2, see https://eslint.org/docs/user-guide/configuring/rules
  "rules": {
    "jest/prefer-strict-equal": "error",
    "jest/prefer-to-have-length": "warn",
    "prettier/prettier": "error",
    "import/prefer-default-export": "off",
    "react/prop-types": "off",
    "react/jsx-filename-extension": "off",
    "react/jsx-props-no-spreading": "off",
    "import/no-extraneous-dependencies": [
      "error",
      {
        "devDependencies": [
          "**/*.test.[jt]s",
          "**/*.spec.[jt]s",
          "**/*.test.[jt]sx",
          "**/*.spec.[jt]sx"
        ]
      }
    ],
    "import/extensions": [
      "error",
      "ignorePackages",
      {
        "ts": "never",
        "tsx": "never",
        "js": "never",
        "jsx": "never"
      }
    ],
    "react/function-component-definition": [
      2,
      {
        "namedComponents": "function-declaration"
      }
    ]
  },
  "overrides": [
    {
      "files": "**/*.+(ts|tsx)",
      "parser": "@typescript-eslint/parser",
      "parserOptions": {
        "project": "./tsconfig.json"
      },
      "plugins": ["@typescript-eslint/eslint-plugin"],
      "extends": [
        "plugin:@typescript-eslint/eslint-recommended", // React Runtime: See also https://github.com/jsx-eslint/eslint-plugin-react/blob/master/docs/rules/react-in-jsx-scope.md but we need to use the rule-"off" below
        "plugin:@typescript-eslint/recommended",
        "prettier",
        // Keep it last
        "plugin:prettier/recommended"
      ],
      "rules": {
        "react/react-in-jsx-scope": "off", // React Runtime: Required so we don't need to import React
        "@typescript-eslint/explicit-function-return-type": "off",
        "@typescript-eslint/no-explicit-any": "off",
        "@typescript-eslint/no-var-requires": "off",
        "no-use-before-define": ["off"],
        "@typescript-eslint/no-use-before-define": ["warn"],
        "import/no-unresolved": "off",
        "import/no-extraneous-dependencies": [
          "error",
          {
            "devDependencies": [
              "**/*.test.ts",
              "**/*.spec.ts",
              "**/*.test.tsx",
              "**/*.spec.tsx"
            ]
          }
        ],
        "quotes": "off",
        "@typescript-eslint/no-unused-vars": [
          "error",
          { "argsIgnorePattern": "^_" }
        ],
        "@typescript-eslint/quotes": [
          "error",
          "single",
          {
            "avoidEscape": true,
            "allowTemplateLiterals": true
          }
        ], // Modified rule
        "react/function-component-definition": [
          "error",
          {
            "namedComponents": "arrow-function",
            "unnamedComponents": "arrow-function"
          }
        ], // Modified rule (Bugfix, see  https://stackoverflow.com/a/69931909/729221)
        "react/require-default-props": "off", // Added rule
        "arrow-body-style": "off" // Modified rule
      }
    }
  ],
  "settings": {
    "import/resolver": {
      "typescript": {
        "project": "."
      }
    },
    "react": {
      "version": "detect"
    }
  }
}