.eslintrc.json

{
  "env": {
    "browser": true,
    "es2021": true
  },
  "extends": [
    "react-app/jest",
    "plugin:react/recommended",
    "plugin:@typescript-eslint/eslint-recommended",
    "plugin:@typescript-eslint/recommended",
    "plugin:import/recommended"
  ],
  "parser": "@typescript-eslint/parser",
  "parserOptions": {
    "ecmaFeatures": {
      "jsx": true
    },
    "ecmaVersion": "latest",
    "sourceType": "module"
  },
  "plugins": ["react", "@typescript-eslint", "prettier"],
  "rules": {
    "no-console": ["warn"],
    "no-param-reassign": ["error", { "props": true, "ignorePropertyModificationsFor": ["state"] }],
    "no-use-before-define": "off",
    "react/jsx-uses-react": "off",
    "react/react-in-jsx-scope": "off",
    "prettier/prettier": [
      "warn",
      {
        "endOfLine": "auto"
      }
    ],
    "@typescript-eslint/no-use-before-define": ["error"],
    "react/jsx-filename-extension": ["warn", { "extensions": [".tsx"] }],
    "import/extensions": [
      "error",
      "ignorePackages",
      {
        "ts": "never",
        "tsx": "never"
      }
    ]
  },
  "overrides": [
    {
      // For test, ignore safe get of possibly undefined objects
      "files": ["*.spec.ts"],
      "rules": {
        "@typescript-eslint/no-non-null-assertion": "off"
      }
    }
  ],
  "settings": {
    "react": {
      "version": "detect"
    },
    "import/resolver": {
      "typescript": {}
    }
  }
}