What happens once you wrap your app in strict mode?
<StrictMode> lets you find common bugs in your components early during development process. Although the Strict Mode checks only run in development, they help you find bugs that already exist in your code but can be tricky to reliably reproduce in production. Strict Mode lets you fix bugs before your users report them.
Strict Mode enables the following checks in development:
Your components will re-render an extra time to find bugs caused by impure rendering.
Your components will re-run Effects an extra time to find bugs caused by missing Effect cleanup.
Your components will be checked for usage of deprecated APIs.