Safari needs a workaround for unary await expressions without parens

[diagramatics]

If you run if (!await test()) { return true } in Safari 10/11, it will throw you a parsing error, needing await test() to be wrapped in parentheses so the parser doesn't trip up. CC thinks the parens is unnecessary and strips it out though.

Here's a replication link to the CC UI.

This has been reported in Webkit fixed in later versions, documented and fixed in UglifyJS here and here.

[nreid260]

Created Google internal issue http://b/144427249

[diagramatics]

Heya just following up on this if there's anything that has been done for it?

[nreid260]

This issue hasn't been prioritized. The best workaround I can suggest is transpiling to ES5, so that await is no longer emitted.