injectedJavaScript stopped working after 9.0.0

Bug description:

The injectedJavaScript parameter no longer works.

To Reproduce:

This used to work:

<WebView injectedJavaScript={`try{var audioCtx = new (window.AudioContext || window.webkitAudioContext)();
  var oscillator = audioCtx.createOscillator();
  oscillator.type = 'sine';
  oscillator.frequency.setValueAtTime(420, audioCtx.currentTime);
  oscillator.start();
  var oscillator_volume = audioCtx.createGain();
  oscillator_volume.gain.linearRampToValueAtTime(1, 0);
  oscillator.connect(oscillator_volume);
  oscillator_volume.connect(audioCtx.destination);
  }catch(e){}
  true;`} />

but no longer does. Expected behavior:

That the above js code gets ejected into the WebView, executes and plays the sound created by the oscillator.

Screenshots/Videos:

Environment:

• OS: iOS
• OS version:
• react-native version:
• react-native-webview version:

[redpandatronicsuk]

@shirakaba Thanks, when passing an empty function to onMessage it works again.

[plaa]

I had the same issue, and yes, adding an empty onMessage function fixed the issue. But this is documented nowhere! The injectedJavaScript documentation should have a big red box saying that you need to define onMessage as well in order for this to work.

It should also be trivial to check that if injectedJavaScript is defined but onMessage is not, then add an empty onMessage in the lib itself, which would fix this issue once and for all.

Please open this issue and fix it or at least document it.