pub trait TransformStreamDefaultControllerMethods<D>where
    D: DomTypes,{
    // Required methods
    fn GetDesiredSize(&self) -> Option<f64>;
    fn Enqueue(
        &self,
        cx: JSContext,
        chunk: Handle<'_, Value>,
        _can_gc: CanGc,
    ) -> Result<(), Error>;
    fn Error(
        &self,
        cx: JSContext,
        reason: Handle<'_, Value>,
        _can_gc: CanGc,
    ) -> Result<(), Error>;
    fn Terminate(&self, _can_gc: CanGc) -> Result<(), Error>;
}