Fixed that Firefox does not support null for optional callback arguments.

Author: KristofferStrube

src/KristofferStrube.Blazor.WebAudio/BaseAudioContext.cs

@@ -387,10 +387,11 @@ public async Task<AudioBuffer> DecodeAudioDataAsync(
         Func<AudioBuffer, Task>? successCallback = null,
         Func<DOMException, Task>? errorCallback = null)
     {
-        IJSObjectReference helper = new ErrorHandlingJSObjectReference(JSRuntime, await webAudioHelperTask.Value);
+        ErrorHandlingJSObjectReference helper = new(JSRuntime, await webAudioHelperTask.Value);
 
         using DotNetObjectReference<DecodeSuccessCallback>? successCallbackObjRef = successCallback is null ? null : DotNetObjectReference.Create(new DecodeSuccessCallback(JSRuntime, successCallback));
         using DotNetObjectReference<DecodeErrorCallback>? errorCallbackObjRef = errorCallback is null ? null : DotNetObjectReference.Create(new DecodeErrorCallback(JSRuntime, errorCallback));
+
         IJSObjectReference jSInstance = await helper.InvokeAsync<IJSObjectReference>("decodeAudioData", JSReference, audioData, successCallbackObjRef, errorCallbackObjRef);
 
         return await AudioBuffer.CreateAsync(JSRuntime, jSInstance, new() { DisposesJSReference = true });

src/KristofferStrube.Blazor.WebAudio/wwwroot/KristofferStrube.Blazor.WebAudio.js

@@ -87,9 +87,10 @@ export function constructOfflineAudioCompletionEvent(type, eventInitDict) {
 }
 
 export async function decodeAudioData(audioContext, audioData, successCallbackObjRef, errorCallbackObjRef) {
-    let successCallback = successCallbackObjRef == null ? null : async (decodedData) => await successCallbackObjRef.invokeMethodAsync('Invoke', DotNet.createJSObjectReference(decodedData));
-    let errorCallback = errorCallbackObjRef == null ? null : async (error) => await errorCallbackObjRef.invokeMethodAsync('Invoke', DOMExceptionInformation(error));
-    return audioContext.decodeAudioData(audioData, successCallback, errorCallback)
+    let successCallback = successCallbackObjRef == null ? () => { } : async (decodedData) => await successCallbackObjRef.invokeMethodAsync('Invoke', DotNet.createJSObjectReference(decodedData));
+    let errorCallback = errorCallbackObjRef == null ? () => { } : async (error) => await errorCallbackObjRef.invokeMethodAsync('Invoke', DOMExceptionInformation(error));
+
+    return audioContext.decodeAudioData(audioData, successCallback, errorCallback);
 }
 
 function DOMExceptionInformation(error) {