three.js/src/animation/KeyframeTrackConstructor.js

import { AnimationUtils } from './AnimationUtils.js';

function KeyframeTrackConstructor( name, times, values, interpolation ) {

	if ( name === undefined ) throw new Error( 'track name is undefined' );

	if ( times === undefined || times.length === 0 ) {

		throw new Error( 'no keyframes in track named ' + name );

	}

	this.name = name;

	this.times = AnimationUtils.convertArray( times, this.TimeBufferType );
	this.values = AnimationUtils.convertArray( values, this.ValueBufferType );

	this.setInterpolation( interpolation || this.DefaultInterpolation );

	this.validate();
	this.optimize();

}

export { KeyframeTrackConstructor };