NodeJS : How to check in Node.js if a file is open/being written to?

To Access My Live Chat Page,
On Google, Search for "hows tech developer connect"

As promised, I have a secret feature that I want to reveal to you.
This is a YouTube's feature which works on Desktop.
First, Make sure the video is currently in playing mode.
After that, type the word 'awesome' on your keyboard.
Your YouTube progress bar will transform into a flashing rainbow.

A little intro about me,
Salutations, my name is Delphi.
I am happy to help you with your questions.
I am available to answer your more specific queries, so feel free to comment or start a chat.
Your input is valuable, so please comment below if you have an answer or any insights to the answer.
Your answer will be acknowledged and appreciated, and I will 'heart' it as a sign of gratitude.