YarnSpinner for Godot - Play sounds when characters are revealed from the typewriter effect

DialogueTypewriterSounds.cs

using System;
using System.Threading;
using Godot;
using Godot.Collections;
using Yarn.Markup;
using YarnSpinnerGodot;

namespace MyGame;

public partial class DialogueTypewriterSounds : ActionMarkupHandler {
    [Export] public Array<AudioStream> typewriterSounds;


    private DateTime _lastTypeWriter = DateTime.Now;
    private const float TYPEWRITER_COOLDOWN = 0.05f;


    public override void OnLineDisplayComplete() { }

    public override void OnLineWillDismiss() { }


    public override void
        OnPrepareForLine(MarkupParseResult line, RichTextLabel text) { }

    public override void
        OnLineDisplayBegin(MarkupParseResult line, RichTextLabel text) { }

    public override YarnTask OnCharacterWillAppear(int currentCharacterIndex,
        MarkupParseResult line,
        CancellationToken cancellationToken) {
        var elapsed = DateTime.Now - _lastTypeWriter;
        if (elapsed <= TimeSpan.FromSeconds(TYPEWRITER_COOLDOWN)) {
            return YarnTask.CompletedTask;
        }
        // todo : <play a sound from typeWriterSounds here >
        _lastTypeWriter = DateTime.Now;
        return YarnTask.CompletedTask;
    }
}