EmscriptenAudioWorkletNodeCreateOptions has bindings for options of AudioWorkletNode itself, but AudioWorkletNode inherits from AudioNode which also accepts:

• channelCount
• channelCountMode
• channelInterpretation

Being able to configure those is useful when you e.g. care about only one input audio channel and don't want the Web Audio system to produce garbage Float32Arrays for other channels that you're going to ignore anyway.

cc @juj