Class Timer

src/core/Timer.js:15–232

 */

export class Timer {

	/**
	 * Constructs a new timer.
	 */

	constructor() {

		/**
		 * The start time in milliseconds.
		 *
		 * @type {Number}
		 * @private
		 */

		this.startTime = performance.now();

		/**
		 * The previous time in milliseconds.
		 *
		 * @type {Number}
		 * @private
		 */

		this.previousTime = 0;

		/**
		 * The current time in milliseconds.
		 *
		 * @type {Number}
		 * @private
		 */

		this.currentTime = 0;

		/**
		 * The most recent delta time in milliseconds.
		 *
		 * @type {Number}
		 * @private
		 * @see {@link delta}
		 */

		this._delta = 0;

		/**
		 * The total elapsed time in milliseconds.
		 *
		 * @type {Number}
		 * @private
		 * @see {@link elapsed}
		 */

		this._elapsed = 0;

		/**
		 * The fixed time step in milliseconds. Default is 16.667 (60 fps).
		 *