[pipeline operator] support await

[xtuc]

Choose one: is this a bug report or feature request?

Input Code

promise |> await

which is the equivalent of

await promise

Expected Behavior

var _promise;

_promise = promise, await _promise;

Current Behavior

Parse error: await is a reserved word (1:11)

Possible Solution

Context

Your Environment

software	version(s)
Babel
Babylon
node
npm
Operating System

As described in the spec here.

[lijialiang]

Will not continue to support await ? sorry to disturb.

[xtuc]

Sorry I don't understand your point @lilijialiang. This is only an addition to the existing support in Babel.

[ksmithbaylor]

Does the spec actually support this? The example in the README only shows

x |> await f

which is an equivalent of

await f

And in the current grammar defined in the spec draft, there is no option for a RHS without a LogicalORExpression expansion.

EDIT:

I just saw the discussion in tc39/proposal-pipeline-operator#66 and corresponding PR tc39/proposal-pipeline-operator#71 which explains that this used to be supported but no longer is.

[mAAdhaTTah]

This is not currently specced yet but will be supported in the parser in #7458 and eventually added as an option in the pipeline plugin.

[thiagoarrais]

Should this be closed?

[mAAdhaTTah]

@thiagoarrais I'll be implementing this as part of the F# parsing. It's not strictly necessary to track but isn't technically "resolved". Up to the maintainers what they want to do here.

[thiagoarrais]

Sorry for the noise. I interpreted that this was already implemented in F#.

[nicolo-ribaudo]

I added this to https://github.com/babel/babel/projects/9#card-17016058 so we don't forget to close it when it is fixed

[nicolo-ribaudo]

Supported by #9984