Can we skip some token check like 'const'

[kiner-tang]

Sometime, we need check es5 but want to skip some token check like 'const'.

[yowainwright]

Hey, @kiner-tang! I think const will fail to be parsed many es5 based-browsers—or at lease it did. 😄
Can you provide more feedback on what you're looking for? Maybe we can back an optional feature in.
Thank you! Sorry for the slow response!