What does non-shimmable mean?

Question

I read the vuejs2 documentation and found this part:

This function is only for ES5 and un- with the ability to adjust, so Vue does not support IE8 and lower.

I think this means that this function cannot be fixed, but I'm not sure.

So what is the (un-) shimmable function in JavaScript?

Answer 1

You understand correctly, a gasket is a patch that provides otherwise inaccessible functionality or a language function.

Some functions, however, require support from the main JS engine and cannot be created exclusively in Javascript. I guess what they meant.