Allow user to update peaks and/or duration with setOptions

src/wavesurfer.ts

@@ -353,14 +353,25 @@ class WaveSurfer extends Player<WaveSurferEvents> {
   /** Set new wavesurfer options and re-render it */
   public setOptions(options: Partial<WaveSurferOptions>) {
     this.options = Object.assign({}, this.options, options)
-    this.renderer.setOptions(this.options)
 
     if (options.audioRate) {
       this.setPlaybackRate(options.audioRate)
     }
     if (options.mediaControls != null) {
       this.getMediaElement().controls = options.mediaControls
     }
+    if (options.duration && !options.peaks) {
+      this.decodedData = Decoder.createBuffer(this.exportPeaks(), options.duration)
+    }
+    if (options.peaks && options.duration) {
+      // Create new decoded data buffer from peaks and duration
+      this.decodedData = Decoder.createBuffer(
+        options.peaks,
+        options.duration
+      );
+    }
+
+    this.renderer.setOptions(this.options)
   }
 
   /** Register a wavesurfer.js plugin */