ES6 doesn't need opt-in

Allen Wirfs-Brock allen at
Tue Jan 3 12:16:25 PST 2012

On Jan 3, 2012, at 12:01 PM, Brendan Eich wrote:

> On Jan 3, 2012, at 1:29 AM, Andreas Rossberg wrote:
>> ...
>> For multi-part scripts we need a way to switch the
>> _proper_ top-level into extended mode. Or should I not be able to
>> write (the relevant bits of) a multi-part script in extended mode at
>> all?
> The proposal may have been unclear on this point: the top level would allow as much new syntax and semantics as can be tolerated backwards-compatibly. The hard cases are let, lexical scope in the free-variables-are-errors sense Dave described (extant globals at start of module body are imported), and any runtime shifts we want (completion reform, typeof null).

I suspect there will also be issue related to legacy function declarations within blocks.


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