JavaScript: get browser network files

Use performance.getEntries() to get a list of network files:

performance.getEntries();

To filter files by the .js extension:

performance
  .getEntries()
  .map((entry) => entry.name)
  .filter((url) => url.includes('.js'));

To filter files by the .css extension:

performance
  .getEntries()
  .map((entry) => entry.name)
  .filter((url) => url.includes('.css'));