[Webkit-unassigned] [Bug 220038] New: Unable to postMessage a WebAssembly module to a worklet

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=220038

            Bug ID: 220038
           Summary: Unable to postMessage a WebAssembly module to a
                    worklet
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Web Audio
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: rnewman at twinql.com
                CC: cdumez at apple.com

WebAssembly modules can be sent between workers and pages via postMessage.

Both Firefox and Chrome also allow WebAssembly modules to be sent from a page to an AudioWorklet via its MessagePort:

  https://developer.mozilla.org/en-US/docs/Web/API/AudioWorkletNode/port

E.g.,

```
  this.port.postMessage({ message: 'hey', module });
```

in Safari Technology Preview (117, WebKit 15611.1.7.2), this throws 

```
  DataCloneError: The object can not be cloned.
```

(FWIW, adding `module` to the transfer list doesn't help; I guess Safari doesn't support transfer lists either?)

The lack of this capability prevents a common code loading approach for AudioWorklets, where some large chunk of WebAssembly is loaded in a worker and sent via the page down to the AudioWorklet via the MessagePort. 

I have not yet verified whether there's a workaround by posting a multi-megabyte ArrayBuffer and compiling it inside the worklet.

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