Early error behavior is proposed to be deferred (i.e. made lazy), not skipped. Additionally, it is one of many things that require frontends to look at every character of the source.
I contend that the text format for JS is no way easy to implement or extend, though I can only offer my personal experience as an engine hacker.
I contend that the text format for JS is no way easy to implement or extend, though I can only offer my personal experience as an engine hacker.