The @sinonjs/eslint-plugin-no-prototype-methods package is an ESLint plugin designed to prevent the use of direct prototype methods on native JavaScript objects. This helps avoid unintended side effects and potential conflicts when stubbing or mocking these methods with Sinon.js. This plugin promotes safer and more predictable testing practices by encouraging the use of recommended Sinon.js alternatives instead of directly patching prototypes. It ultimately leads to more robust and maintainable tests.