feat: OfflineContext returns a ToneAudioBuffer

instead of an AudioBuffer

Author: tambien

Tone/core/context/OfflineContext.ts

@@ -2,6 +2,7 @@ import { createOfflineAudioContext } from "../context/AudioContext";
 import { Context } from "../context/Context";
 import { Seconds } from "../type/Units";
 import { isOfflineAudioContext } from "../util/AdvancedTypeCheck";
+import { ToneAudioBuffer } from "./ToneAudioBuffer";
 
 /**
  * Wrapper around the OfflineAudioContext
@@ -91,10 +92,11 @@ export class OfflineContext extends Context {
 	 * Render the output of the OfflineContext
 	 * @param async If the clock should be rendered asynchronously, which will not block the main thread, but be slightly slower.
 	 */
-	async render(asynchronous: boolean = true): Promise<AudioBuffer> {
+	async render(asynchronous: boolean = true): Promise<ToneAudioBuffer> {
 		await this.workletsAreReady();
 		await this._renderClock(asynchronous);
-		return this._context.startRendering();
+		const buffer = await this._context.startRendering();
+		return new ToneAudioBuffer(buffer);
 	}
 
 	/**

test/helper/Offline.ts

@@ -28,7 +28,7 @@ export async function Offline(
 	}
 	setContext(originalContext);
 	const buffer = await offline.render();
-	return new TestAudioBuffer(buffer);
+	return new TestAudioBuffer(buffer.get() as AudioBuffer);
 }
 
 export function whenBetween(value: Seconds, start: Seconds, stop: Seconds, callback: () => void): void {