.eslintrc.json

{
  "globals": {
    "__PATH_PREFIX__": true
  },
  "extends": ["react-app", "preact", "plugin:@typescript-eslint/recommended"],
  "plugins": ["@typescript-eslint" /*  "unused-imports" */],
  "overrides": [
    {
      "files": ["*.ts", "*.tsx"],
      "rules": {
        "no-console": "error",
        "no-shadow": "off",
        // "@typescript-eslint/no-shadow": "error",
        // "unused-imports/no-unused-imports": "error",
        // "unused-imports/no-unused-vars": "error",
        "@typescript-eslint/no-unused-vars": "off",
        "react/no-unused-state": "error",
        "prefer-template": "off",
        "no-nested-ternary": "error",
        "no-unneeded-ternary": "error",
        // "no-unnecessary-condition": "error",
        // "@typescript-eslint/no-unnecessary-condition": "error",
        // "no-uneces"
        "react/jsx-key": [
          2,
          {
            "warnOnDuplicates": true,
            "checkKeyMustBeforeSpread": true,
            "checkFragmentShorthand": true
          }
        ],
        "react/no-array-index-key": "warn",
        // "arrow-body-style": ["error", "as-needed"],
        "spaced-comment": ["error", "always"],
        "@typescript-eslint/explicit-member-accessibility": "error",
        "@typescript-eslint/explicit-function-return-type": "off",
        "@typescript-eslint/no-non-null-assertion": "off",
        "@typescript-eslint/no-empty-interface": "off",
        "@typescript-eslint/consistent-type-imports": "error",
        "@typescript-eslint/prefer-ts-expect-error": "error",
        "@typescript-eslint/no-extra-semi": "off",
        "react-hooks/exhaustive-deps": "off",
        "react/react-in-jsx-scope": "off",
        "react/jsx-uses-vars": "error",
        "react/jsx-uses-react": "error",
        "no-trailing-spaces": "error",
        "no-mixed-spaces-and-tabs": "error",
        "no-return-await": "error",
        "radix": ["error", "as-needed"]
      }
    }
  ],

  //
  //
  /* *
   *  fix eslint error "jest"
   * https://github.com/microsoft/vscode-eslint/issues/
   * 1145#issuecomment-781551124
   * */
  "settings": {
    "jest": {"version": 26}
  }
}