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

• #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.

• #1389

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

[Tzvetan Mikov]

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