Is there any way to skip checking to a specific keyword?

[donggyu04]

Hi, Is there any way to skip checking to a specific keyword?
I support only IE11. so specific keyword like const is ES6 syntax but, It is fully supported by IE11.

so when I check the version of es5, I want to pass the task even if const exists.
Is there any way for this?

Thanks in advance.

[lesleh]

It doesn't look doable, I checked the acorn documentation and there's nothing there about it.