Apologies, I thought that by marking my initial feedback as a spoiler, it would be inherited by all further comments.
Yeah, I did end up using that to solve the Kata.
I thought you had seen my solution and were hinting that there was a different one I could/should have used.

I know you asked this question a long time ago, but I think it is because trim() removes leading and trailing white spaces. The Kata asks you to remove all spaces, including the ones in between strings of characters.

Ok so what is the similar function that does the same job?

I checked https://node.green/#ES2021-features, which shows that replaceAll is not supported on v14.x, but it does not present an alternative.