NodeJS : Using a global variable in Node.js for dependency injection

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

I promised to reveal a secret feature to you, and now it's time to share it.
This is a YouTube's feature which works on Desktop.
First, Ensure that the video is playing before proceeding.
After that, type the word 'awesome' on your keyboard.
The progress bar on YouTube will be altered to a flashing rainbow.

Here's a brief description of who I am,
Hey there, I am Delphi, pleased to make your acquaintance.
I help you answer your questions.
I am happy to answer more specific questions, so please feel free to comment or chat with me.
If you have knowledge to contribute or an answer to provide, please leave a comment below.
A 'heart' from me is a way of showing appreciation for your answer.