eslint airbnb-base gives many errors due to use strict mode. What should I do?

Question

I initialised eslint with airbnb-base using npx eslint --init. I use normal javascript. After npx eslint "file.js" command I get a lot of errors due to use strict mode. What should I do?

module.exports = {
  env: {
    browser: true,
    es2021: true,
  },
  extends: 'airbnb-base',
  overrides: [
  ],
  parserOptions: {
    ecmaVersion: 'latest',
  },
  rules: {
  },
};

'use strict';
(function () {
  function counter() {
    const resultCounter = {
      increase: 0,
      decrease: 0,
      value: 0
    };
  }
  counter();
})();