write bang-syntax convertor

We’d like to be able to use “bang syntax” in userspace Vat code: x ! foo(y). This should be converted into E(x).foo(y). This probably wants to be a plugin to our use of rollup when bundling the vat code into a single string.

If we can accomplish that, we should jump ahead to converting it into E('send', x, 'foo', y), and change the E object to match. By providing the method name as a string, we can avoid the need for a Proxy (to glean the method name when it gets looked up), which would be faster and simpler.

The original Promises proposal (http://web.archive.org/web/20161026162206/http://wiki.ecmascript.org/doku.php?id=strawman:concurrency) describes the syntax, although we might need to update some parts of it.

[michaelfig]

I may have a go at this for Tessie… I’m already using Babel to do the rewrites from Tessie to Jessie.

(And I would like to use Tessie to write vat code for SwingSet.)

[warner]

in the old repo. this was SwingSet issue 6