frogc doesn't work with fields on interfaces that wrap native JavaScript objects

[skybrian]

The html API generates a bunch of interfaces that are wrappers around JavaScript objects. Many of them have fields. For example:

interface AudioProcessingEvent extends Event {
  AudioBuffer get inputBuffer();
  AudioBuffer get outputBuffer();
}

When I actually try to use any of these fields in Dart, I get an error:

Uncaught TypeError: Object #<AudioProcessingEvent> has no method 'get$outputBuffer'

It appears that frogc is using its own calling convention (calling a method) instead of doing it the native JavaScript way (accessing a field).

(Also, shouldn't this

[jmesserly]

I'm guessing fields aren't using the hidden native convention.

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Added Area-Frog label.

[skybrian]

This is likely not a real compiler issue. It's due to how I'm working around bugs in the html library. I'm not using the generated wrappers. Instead I'm using a native function to create a JavaScript object and "cast" it directly to the interface type.

[jmesserly]

Ah, that makes sense.

If you're using native JS, you might be able to put a block of Dart code after the native, like this:
makeFoo() native "... JS code to create a Foo ...";
...
  if (false) {
 // trick compiler to think AudioProcessingEvent is used:
    AudioProcessingEvent e;
    e is AudioProcessingEvent;
    e.inputBuffer;
    e.outputBuffer;
  }

I'm not sure if that will work (since AudioProcessingEvent is an interface) but worth a shot.

[DartBot]

This comment was originally written by [email protected]

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Added Triaged label.

[dgrove]

Added this to the FrogEditor milestone.

[jmesserly]

based on comments above, I don't think this was a real compiler issue.

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Added Invalid label.