Consider the following example:

```
const offlineAudioContext = new OfflineAudioContext({ length: 128, sampleRate: 44100 });

const processor = `class InputOnlyProcessor extends AudioWorkletProcessor {
    static get parameterDescriptors() {
        return [ ];
    }
    process () {
        this.port.postMessage(null);
        return false;
    }
}
registerProcessor('input-only-processor', InputOnlyProcessor);`;

const blob = new Blob([ processor ], { type: 'application/javascript; charset=utf-8' });
const url = URL.createObjectURL(blob);

await offlineAudioContext.audioWorklet.addModule(url);

const audioWorkletNode = new AudioWorkletNode(offlineAudioContext, 'input-only-processor', { numberOfInputs: 1, numberOfOutputs: 0 });
const constantSourceNode = new ConstantSourceNode(offlineAudioContext);

audioWorkletNode.port.onmessage = () => {
    console.log('process() was called');
};

constantSourceNode.connect(audioWorkletNode);
constantSourceNode.start();

offlineAudioContext.startRendering();
```

The AudioWorkletNode's process method does not get called. The only solution is to create a bogus output and connect it to the destination.