How to use the ilib/lib/DurationFmt function in ilib

jump = (distance) => {
		if (this.state.sourceUnavailable) {
			return;
		}

		this.pulsedPlaybackRate = toUpperCase(new DurationFmt({length: 'long'}).format({second: this.props.jumpBy}));
		this.pulsedPlaybackState = distance > 0 ? 'jumpForward' : 'jumpBackward';
		this.showFeedback();
		this.startDelayedFeedbackHide();
		this.seek(this.state.currentTime + distance);
		this.startDelayedMiniFeedbackHide();
	}