Native @ReactMethod promise asking a Callback will bug/crash

[FayDoom]

Description

If a Java @ReactMethod ask for a Callback and a Promise, React native will throw :

"Error: Exception in HostFunction: Malformed calls from JS: field sizes are different."

If Hermes is enabled, the app will just crash with :

"A/libc: Fatal signal 6 (SIGABRT), code -6 (SI_TKILL)"

React Native version:

I tried on 0.63.0 and 0.63.1. Same issue.

Steps To Reproduce

1. Init a new RN project
2. Create a Java module with a method asking a Callback and a Promise :
   @ReactMethod public void jCall(Callback cb, Promise p){ ... }
3. Call it from Javascript
   await _javaModule.jCall((e)=>{ ... })

Expected Results

The method should be called, passing the react.bridge.Callback and implicitly a react.bridge.Promise to the Java side and not crash.

Edit

After a few more tests (all with Hermes enabled), there are my results :

• When two Callback are required, everything works.
  @ReactMethod public void jCall(Callback res, Callback rej){ ... }
await _javaModule.jCall((e)=>{ ... }, (e)=>{ ... })

• When three Callback are required, It doesn't crash this time but throw an error.
  @ReactMethod public void jCall(Callback cb, Callback res, Callback rej){ ... }
await _javaModule.jCall((e)=>{ ... }, (e)=>{ ... }, (e)=>{ ... })
  Throw : Malformed calls from JS: field sizes are different

• It seems that we can't invoke multiple distincts callbacks. Which explain some of my results. Is it meant to be that way ? If so, the official documentation isn't clear.

[SudoPlz]

I just posted a long answer here about what's happening and how to troubleshoot that: https://stackoverflow.com/a/67100389/1658268

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[github-actions]

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