Trouble using require(); Needing to convert JS file to ES module

When I use require() in my JS file, I get the following error: File is a CommonJS module; it may be converted to an ES module.

Why is it so? And how can I use require, ie, convert my JS file into an ES module?

I have tried to append "type":"module" to my javascript file, and that didn’t help solve the problem.

I want to use require(). How can I do that?
Also, I am a bit of a newbie to JS so thank you for your patience.

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