Feature request: Improved error async arrow functions are unsupported

[leotm]

Problem

async arrow functions (ignored by Babel) trigger Hermes error

hermes/lib/IRGen/ESTreeIRGen-func.cpp

Line 215 in 4ab9f17

AF->getSourceRange(), Twine("async functions are unsupported"));

causing ./gradlew :app:installRelease to fail
after Metro finishes bundling

Solution

it would be great if Hermes would output instead

async arrow functions are unsupported

Additional Context

• Async arrow functions are not supported, making 'show source' unusable inside them #1208

  The good news is that we will be releasing a beta version of Hermes supporting most ES6+ features in 2024 Q1, so at that time none of these plugins will be necessary.

• Importing files suppress async generators are unsupported errors #1389

nb: i think Static Hermes will be supporting arrow functions too

[tmikov]

That is a good point. So, basically we need to make the error message more specific. Can you please submit a PR for this?

[kleydon]

Has anyone figured out how to configure support for async arrow functions using plug-ins, in the meantime? Would really love to know how to do this.

[ChALkeR]

@kleydon yes: https://github.com/ExodusMovement/test/blob/6e928e7267eb5ef19d316e0b09b81d49553bfd8f/bundler/bundle.js#L57-L63 + rest is in esbuild config in the same file

[fbmal7]

FWIW, async arrows are implemented in SH

[kleydon]

@ChALkeR , @fbmal7 - thanks!