[magicalist]

You have it backwards with ActionScript. ActionScript 2.0 came out of the initial years of work of ES4, and ActionScript 3.0 came out after yet more work from TC39. Both were designed to directly take what came out of the ES4 process and fold it into ActionScript (so much so that you'll recall that originally Mozilla was going to use Adobe's Tamarin ActionScript JIT compiler as a starting point for their Firefox ES4 engine[1]).

Adobe was a big proponent of many of the big features in ES4, but so were Mozilla and others on the committee. Adobe was hoping that the work in AS2 (and eventually AS3) would anticipate what was coming and that JavaScript developers would be able to easily move back and forth between the web and Flash/Flex/whatever else they had planned at the time.

Of course influence went the other way as well: Adobe's experience with the needs of ActionScript 1.0 developers were informing what was focused on in designing ES4...but that's exactly why you bring people into committees, to help guide what comes out of them.

[1] http://www-archive.mozilla.org/projects/tamarin/