Is there a way to debug Javascript with "break at first line javascript" setting?

Question

JavaScript

There is a very large file with functions. We need to find a function that is executed a couple of seconds after the page is loaded.
What program can be used to "break at first line javascript"? Tell me which way to dig. Thank you!

Answer 1

debugger;at the very beginning of the file, insert and search step by step

Answer 2

1. Open DevTools - F12
2. Go to the debugger tab
3. ???
4. PROFIT! We now have a full-fledged debugger