message: time is optional in toSeconds
diff: @@ -78,7 +78,7 @@ export abstract class ToneWithContext<Options extends ToneWithContextOptions> ex
  /**
  * Convert the incoming time to seconds
  */
  - toSeconds(time: Time): Seconds {
  + toSeconds(time?: Time): Seconds {
  return new TimeClass(this.context, time).toSeconds();
  }
  