tween.umd.js

(function (global, factory) {
    typeof exports === 'object' && typeof module !== 'undefined' ? factory(exports) :
    typeof define === 'function' && define.amd ? define(['exports'], factory) :
    (global = typeof globalThis !== 'undefined' ? globalThis : global || self, factory(global.TWEEN = {}));
}(this, (function (exports) { 'use strict';

    /**
     * The Ease class provides a collection of easing functions for use with tween.js.
     */
    var Easing = {
        Linear: {
            None: function (amount) {
                return amount;
            },
        },
        Quadratic: {
            In: function (amount) {
                return amount * amount;
            },
            Out: function (amount) {
                return amount * (2 - amount);
            },
            InOut: function (amount) {
                if ((amount *= 2) < 1) {
                    return 0.5 * amount * amount;
                }
                return -0.5 * (--amount * (amount - 2) - 1);
            },
        },
        Cubic: {
            In: function (amount) {
                return amount * amount * amount;
            },
            Out: function (amount) {
                return --amount * amount * amount + 1;
            },
            InOut: function (amount) {
                if ((amount *= 2) < 1) {
                    return 0.5 * amount * amount * amount;
                }
                return 0.5 * ((amount -= 2) * amount * amount + 2);
            },
        },
        Quartic: {
            In: function (amount) {
                return amount * amount * amount * amount;
            },
            Out: function (amount) {
                return 1 - --amount * amount * amount * amount;
            },
            InOut: function (amount) {
                if ((amount *= 2) < 1) {
                    return 0.5 * amount * amount * amount * amount;
                }
                return -0.5 * ((amount -= 2) * amount * amount * amount - 2);
            },
        },
        Quintic: {
            In: function (amount) {
                return amount * amount * amount * amount * amount;
            },
            Out: function (amount) {
                return --amount * amount * amount * amount * amount + 1;
            },
            InOut: function (amount) {
                if ((amount *= 2) < 1) {
                    return 0.5 * amount * amount * amount * amount * amount;
                }
                return 0.5 * ((amount -= 2) * amount * amount * amount * amount + 2);
            },
        },
        Sinusoidal: {
            In: function (amount) {
                return 1 - Math.sin(((1.0 - amount) * Math.PI) / 2);
            },
            Out: function (amount) {
                return Math.sin((amount * Math.PI) / 2);
            },
            InOut: function (amount) {
                return 0.5 * (1 - Math.sin(Math.PI * (0.5 - amount)));
            },
        },
        Exponential: {
            In: function (amount) {
                return amount === 0 ? 0 : Math.pow(1024, amount - 1);
            },
            Out: function (amount) {
                return amount === 1 ? 1 : 1 - Math.pow(2, -10 * amount);
            },
            InOut: function (amount) {
                if (amount === 0) {
                    return 0;
                }
                if (amount === 1) {
                    return 1;
                }
                if ((amount *= 2) < 1) {
                    return 0.5 * Math.pow(1024, amount - 1);
                }
                return 0.5 * (-Math.pow(2, -10 * (amount - 1)) + 2);
            },
        },
        Circular: {
            In: function (amount) {
                return 1 - Math.sqrt(1 - amount * amount);
            },
            Out: function (amount) {
                return Math.sqrt(1 - --amount * amount);
            },
            InOut: function (amount) {
                if ((amount *= 2) < 1) {
                    return -0.5 * (Math.sqrt(1 - amount * amount) - 1);
                }
                return 0.5 * (Math.sqrt(1 - (amount -= 2) * amount) + 1);
            },
        },
        Elastic: {
            In: function (amount) {
                if (amount === 0) {
                    return 0;
                }
                if (amount === 1) {
                    return 1;
                }
                return -Math.pow(2, 10 * (amount - 1)) * Math.sin((amount - 1.1) * 5 * Math.PI);
            },
            Out: function (amount) {
                if (amount === 0) {
                    return 0;
                }
                if (amount === 1) {
                    return 1;
                }
                return Math.pow(2, -10 * amount) * Math.sin((amount - 0.1) * 5 * Math.PI) + 1;
            },
            InOut: function (amount) {
                if (amount === 0) {
                    return 0;
                }
                if (amount === 1) {
                    return 1;
                }
                amount *= 2;
                if (amount < 1) {
                    return -0.5 * Math.pow(2, 10 * (amount - 1)) * Math.sin((amount - 1.1) * 5 * Math.PI);
                }
                return 0.5 * Math.pow(2, -10 * (amount - 1)) * Math.sin((amount - 1.1) * 5 * Math.PI) + 1;
            },
        },
        Back: {
            In: function (amount) {
                var s = 1.70158;
                return amount === 1 ? 1 : amount * amount * ((s + 1) * amount - s);
            },
            Out: function (amount) {
                var s = 1.70158;
                return amount === 0 ? 0 : --amount * amount * ((s + 1) * amount + s) + 1;
            },
            InOut: function (amount) {
                var s = 1.70158 * 1.525;
                if ((amount *= 2) < 1) {
                    return 0.5 * (amount * amount * ((s + 1) * amount - s));
                }
                return 0.5 * ((amount -= 2) * amount * ((s + 1) * amount + s) + 2);
            },
        },
        Bounce: {
            In: function (amount) {
                return 1 - Easing.Bounce.Out(1 - amount);
            },
            Out: function (amount) {
                if (amount < 1 / 2.75) {
                    return 7.5625 * amount * amount;
                }
                else if (amount < 2 / 2.75) {
                    return 7.5625 * (amount -= 1.5 / 2.75) * amount + 0.75;
                }
                else if (amount < 2.5 / 2.75) {
                    return 7.5625 * (amount -= 2.25 / 2.75) * amount + 0.9375;
                }
                else {
                    return 7.5625 * (amount -= 2.625 / 2.75) * amount + 0.984375;
                }
            },
            InOut: function (amount) {
                if (amount < 0.5) {
                    return Easing.Bounce.In(amount * 2) * 0.5;
                }
                return Easing.Bounce.Out(amount * 2 - 1) * 0.5 + 0.5;
            },
        },
        generatePow: function (power) {
            if (power === void 0) { power = 4; }
            power = power < Number.EPSILON ? Number.EPSILON : power;
            power = power > 10000 ? 10000 : power;
            return {
                In: function (amount) {
                    return Math.pow(amount, power);
                },
                Out: function (amount) {
                    return 1 - Math.pow((1 - amount), power);
                },
                InOut: function (amount) {
                    if (amount < 0.5) {
                        return Math.pow((amount * 2), power) / 2;
                    }
                    return (1 - Math.pow((2 - amount * 2), power)) / 2 + 0.5;
                },
            };
        },
    };

    var now;
    // Include a performance.now polyfill.
    // In node.js, use process.hrtime.
    // eslint-disable-next-line
    // @ts-ignore
    if (typeof self === 'undefined' && typeof process !== 'undefined' && process.hrtime) {
        now = function () {
            // eslint-disable-next-line
            // @ts-ignore
            var time = process.hrtime();
            // Convert [seconds, nanoseconds] to milliseconds.
            return time[0] * 1000 + time[1] / 1000000;
        };
    }
    // In a browser, use self.performance.now if it is available.
    else if (typeof self !== 'undefined' && self.performance !== undefined && self.performance.now !== undefined) {
        // This must be bound, because directly assigning this function
        // leads to an invocation exception in Chrome.
        now = self.performance.now.bind(self.performance);
    }
    // Use Date.now if it is available.
    else if (Date.now !== undefined) {
        now = Date.now;
    }
    // Otherwise, use 'new Date().getTime()'.
    else {
        now = function () {
            return new Date().getTime();
        };
    }
    var now$1 = now;

    /**
     * Controlling groups of tweens
     *
     * Using the TWEEN singleton to manage your tweens can cause issues in large apps with many components.
     * In these cases, you may want to create your own smaller groups of tween
     */
    var Group = /** @class */ (function () {
        function Group() {
            this._tweens = {};
            this._tweensAddedDuringUpdate = {};
        }
        Group.prototype.getAll = function () {
            var _this = this;
            return Object.keys(this._tweens).map(function (tweenId) {
                return _this._tweens[tweenId];
            });
        };
        Group.prototype.removeAll = function () {
            this._tweens = {};
        };
        Group.prototype.add = function (tween) {
            this._tweens[tween.getId()] = tween;
            this._tweensAddedDuringUpdate[tween.getId()] = tween;
        };
        Group.prototype.remove = function (tween) {
            delete this._tweens[tween.getId()];
            delete this._tweensAddedDuringUpdate[tween.getId()];
        };
        Group.prototype.update = function (time, preserve) {
            if (time === void 0) { time = now$1(); }
            if (preserve === void 0) { preserve = false; }
            var tweenIds = Object.keys(this._tweens);
            if (tweenIds.length === 0) {
                return false;
            }
            // Tweens are updated in "batches". If you add a new tween during an
            // update, then the new tween will be updated in the next batch.
            // If you remove a tween during an update, it may or may not be updated.
            // However, if the removed tween was added during the current batch,
            // then it will not be updated.
            while (tweenIds.length > 0) {
                this._tweensAddedDuringUpdate = {};
                for (var i = 0; i < tweenIds.length; i++) {
                    var tween = this._tweens[tweenIds[i]];
                    var autoStart = !preserve;
                    if (tween && tween.update(time, autoStart) === false && !preserve) {
                        delete this._tweens[tweenIds[i]];
                    }
                }
                tweenIds = Object.keys(this._tweensAddedDuringUpdate);
            }
            return true;
        };
        return Group;
    }());

    /**
     *
     */
    var Interpolation = {
        Linear: function (v, k) {
            var m = v.length - 1;
            var f = m * k;
            var i = Math.floor(f);
            var fn = Interpolation.Utils.Linear;
            if (k < 0) {
                return fn(v[0], v[1], f);
            }
            if (k > 1) {
                return fn(v[m], v[m - 1], m - f);
            }
            return fn(v[i], v[i + 1 > m ? m : i + 1], f - i);
        },
        Bezier: function (v, k) {
            var b = 0;
            var n = v.length - 1;
            var pw = Math.pow;
            var bn = Interpolation.Utils.Bernstein;
            for (var i = 0; i <= n; i++) {
                b += pw(1 - k, n - i) * pw(k, i) * v[i] * bn(n, i);
            }
            return b;
        },
        CatmullRom: function (v, k) {
            var m = v.length - 1;
            var f = m * k;
            var i = Math.floor(f);
            var fn = Interpolation.Utils.CatmullRom;
            if (v[0] === v[m]) {
                if (k < 0) {
                    i = Math.floor((f = m * (1 + k)));
                }
                return fn(v[(i - 1 + m) % m], v[i], v[(i + 1) % m], v[(i + 2) % m], f - i);
            }
            else {
                if (k < 0) {
                    return v[0] - (fn(v[0], v[0], v[1], v[1], -f) - v[0]);
                }
                if (k > 1) {
                    return v[m] - (fn(v[m], v[m], v[m - 1], v[m - 1], f - m) - v[m]);
                }
                return fn(v[i ? i - 1 : 0], v[i], v[m < i + 1 ? m : i + 1], v[m < i + 2 ? m : i + 2], f - i);
            }
        },
        Utils: {
            Linear: function (p0, p1, t) {
                return (p1 - p0) * t + p0;
            },
            Bernstein: function (n, i) {
                var fc = Interpolation.Utils.Factorial;
                return fc(n) / fc(i) / fc(n - i);
            },
            Factorial: (function () {
                var a = [1];
                return function (n) {
                    var s = 1;
                    if (a[n]) {
                        return a[n];
                    }
                    for (var i = n; i > 1; i--) {
                        s *= i;
                    }
                    a[n] = s;
                    return s;
                };
            })(),
            CatmullRom: function (p0, p1, p2, p3, t) {
                var v0 = (p2 - p0) * 0.5;
                var v1 = (p3 - p1) * 0.5;
                var t2 = t * t;
                var t3 = t * t2;
                return (2 * p1 - 2 * p2 + v0 + v1) * t3 + (-3 * p1 + 3 * p2 - 2 * v0 - v1) * t2 + v0 * t + p1;
            },
        },
    };

    /**
     * Utils
     */
    var Sequence = /** @class */ (function () {
        function Sequence() {
        }
        Sequence.nextId = function () {
            return Sequence._nextId++;
        };
        Sequence._nextId = 0;
        return Sequence;
    }());

    var mainGroup = new Group();

    /**
     * Tween.js - Licensed under the MIT license
     * https://github.com/tweenjs/tween.js
     * ----------------------------------------------
     *
     * See https://github.com/tweenjs/tween.js/graphs/contributors for the full list of contributors.
     * Thank you all, you're awesome!
     */
    var Tween = /** @class */ (function () {
        function Tween(_object, _group) {
            if (_group === void 0) { _group = mainGroup; }
            this._object = _object;
            this._group = _group;
            this._isPaused = false;
            this._pauseStart = 0;
            this._valuesStart = {};
            this._valuesEnd = {};
            this._valuesStartRepeat = {};
            this._duration = 1000;
            this._initialRepeat = 0;
            this._repeat = 0;
            this._yoyo = false;
            this._isPlaying = false;
            this._reversed = false;
            this._delayTime = 0;
            this._startTime = 0;
            this._easingFunction = Easing.Linear.None;
            this._interpolationFunction = Interpolation.Linear;
            // eslint-disable-next-line
            this._chainedTweens = [];
            this._onStartCallbackFired = false;
            this._onEveryStartCallbackFired = false;
            this._id = Sequence.nextId();
            this._isChainStopped = false;
            this._goToEnd = false;
        }
        Tween.prototype.getId = function () {
            return this._id;
        };
        Tween.prototype.isPlaying = function () {
            return this._isPlaying;
        };
        Tween.prototype.isPaused = function () {
            return this._isPaused;
        };
        Tween.prototype.to = function (properties, duration) {
            // TODO? restore this, then update the 07_dynamic_to example to set fox
            // tween's to on each update. That way the behavior is opt-in (there's
            // currently no opt-out).
            // for (const prop in properties) this._valuesEnd[prop] = properties[prop]
            this._valuesEnd = Object.create(properties);
            if (duration !== undefined) {
                this._duration = duration;
            }
            return this;
        };
        Tween.prototype.duration = function (d) {
            if (d === void 0) { d = 1000; }
            this._duration = d;
            return this;
        };
        Tween.prototype.start = function (time) {
            if (time === void 0) { time = now$1(); }
            if (this._isPlaying) {
                return this;
            }
            // eslint-disable-next-line
            this._group && this._group.add(this);
            this._repeat = this._initialRepeat;
            if (this._reversed) {
                // If we were reversed (f.e. using the yoyo feature) then we need to
                // flip the tween direction back to forward.
                this._reversed = false;
                for (var property in this._valuesStartRepeat) {
                    this._swapEndStartRepeatValues(property);
                    this._valuesStart[property] = this._valuesStartRepeat[property];
                }
            }
            this._isPlaying = true;
            this._isPaused = false;
            this._onStartCallbackFired = false;
            this._onEveryStartCallbackFired = false;
            this._isChainStopped = false;
            this._startTime = time;
            this._startTime += this._delayTime;
            this._setupProperties(this._object, this._valuesStart, this._valuesEnd, this._valuesStartRepeat);
            return this;
        };
        Tween.prototype._setupProperties = function (_object, _valuesStart, _valuesEnd, _valuesStartRepeat) {
            for (var property in _valuesEnd) {
                var startValue = _object[property];
                var startValueIsArray = Array.isArray(startValue);
                var propType = startValueIsArray ? 'array' : typeof startValue;
                var isInterpolationList = !startValueIsArray && Array.isArray(_valuesEnd[property]);
                // If `to()` specifies a property that doesn't exist in the source object,
                // we should not set that property in the object
                if (propType === 'undefined' || propType === 'function') {
                    continue;
                }
                // Check if an Array was provided as property value
                if (isInterpolationList) {
                    var endValues = _valuesEnd[property];
                    if (endValues.length === 0) {
                        continue;
                    }
                    // handle an array of relative values
                    endValues = endValues.map(this._handleRelativeValue.bind(this, startValue));
                    // Create a local copy of the Array with the start value at the front
                    _valuesEnd[property] = [startValue].concat(endValues);
                }
                // handle the deepness of the values
                if ((propType === 'object' || startValueIsArray) && startValue && !isInterpolationList) {
                    _valuesStart[property] = startValueIsArray ? [] : {};
                    // eslint-disable-next-line
                    for (var prop in startValue) {
                        // eslint-disable-next-line
                        // @ts-ignore FIXME?
                        _valuesStart[property][prop] = startValue[prop];
                    }
                    _valuesStartRepeat[property] = startValueIsArray ? [] : {}; // TODO? repeat nested values? And yoyo? And array values?
                    // eslint-disable-next-line
                    // @ts-ignore FIXME?
                    this._setupProperties(startValue, _valuesStart[property], _valuesEnd[property], _valuesStartRepeat[property]);
                }
                else {
                    // Save the starting value, but only once.
                    if (typeof _valuesStart[property] === 'undefined') {
                        _valuesStart[property] = startValue;
                    }
                    if (!startValueIsArray) {
                        // eslint-disable-next-line
                        // @ts-ignore FIXME?
                        _valuesStart[property] *= 1.0; // Ensures we're using numbers, not strings
                    }
                    if (isInterpolationList) {
                        // eslint-disable-next-line
                        // @ts-ignore FIXME?
                        _valuesStartRepeat[property] = _valuesEnd[property].slice().reverse();
                    }
                    else {
                        _valuesStartRepeat[property] = _valuesStart[property] || 0;
                    }
                }
            }
        };
        Tween.prototype.stop = function () {
            if (!this._isChainStopped) {
                this._isChainStopped = true;
                this.stopChainedTweens();
            }
            if (!this._isPlaying) {
                return this;
            }
            // eslint-disable-next-line
            this._group && this._group.remove(this);
            this._isPlaying = false;
            this._isPaused = false;
            if (this._onStopCallback) {
                this._onStopCallback(this._object);
            }
            return this;
        };
        Tween.prototype.end = function () {
            this._goToEnd = true;
            this.update(Infinity);
            return this;
        };
        Tween.prototype.pause = function (time) {
            if (time === void 0) { time = now$1(); }
            if (this._isPaused || !this._isPlaying) {
                return this;
            }
            this._isPaused = true;
            this._pauseStart = time;
            // eslint-disable-next-line
            this._group && this._group.remove(this);
            return this;
        };
        Tween.prototype.resume = function (time) {
            if (time === void 0) { time = now$1(); }
            if (!this._isPaused || !this._isPlaying) {
                return this;
            }
            this._isPaused = false;
            this._startTime += time - this._pauseStart;
            this._pauseStart = 0;
            // eslint-disable-next-line
            this._group && this._group.add(this);
            return this;
        };
        Tween.prototype.stopChainedTweens = function () {
            for (var i = 0, numChainedTweens = this._chainedTweens.length; i < numChainedTweens; i++) {
                this._chainedTweens[i].stop();
            }
            return this;
        };
        Tween.prototype.group = function (group) {
            if (group === void 0) { group = mainGroup; }
            this._group = group;
            return this;
        };
        Tween.prototype.delay = function (amount) {
            if (amount === void 0) { amount = 0; }
            this._delayTime = amount;
            return this;
        };
        Tween.prototype.repeat = function (times) {
            if (times === void 0) { times = 0; }
            this._initialRepeat = times;
            this._repeat = times;
            return this;
        };
        Tween.prototype.repeatDelay = function (amount) {
            this._repeatDelayTime = amount;
            return this;
        };
        Tween.prototype.yoyo = function (yoyo) {
            if (yoyo === void 0) { yoyo = false; }
            this._yoyo = yoyo;
            return this;
        };
        Tween.prototype.easing = function (easingFunction) {
            if (easingFunction === void 0) { easingFunction = Easing.Linear.None; }
            this._easingFunction = easingFunction;
            return this;
        };
        Tween.prototype.interpolation = function (interpolationFunction) {
            if (interpolationFunction === void 0) { interpolationFunction = Interpolation.Linear; }
            this._interpolationFunction = interpolationFunction;
            return this;
        };
        // eslint-disable-next-line
        Tween.prototype.chain = function () {
            var tweens = [];
            for (var _i = 0; _i < arguments.length; _i++) {
                tweens[_i] = arguments[_i];
            }
            this._chainedTweens = tweens;
            return this;
        };
        Tween.prototype.onStart = function (callback) {
            this._onStartCallback = callback;
            return this;
        };
        Tween.prototype.onEveryStart = function (callback) {
            this._onEveryStartCallback = callback;
            return this;
        };
        Tween.prototype.onUpdate = function (callback) {
            this._onUpdateCallback = callback;
            return this;
        };
        Tween.prototype.onRepeat = function (callback) {
            this._onRepeatCallback = callback;
            return this;
        };
        Tween.prototype.onComplete = function (callback) {
            this._onCompleteCallback = callback;
            return this;
        };
        Tween.prototype.onStop = function (callback) {
            this._onStopCallback = callback;
            return this;
        };
        /**
         * @returns true if the tween is still playing after the update, false
         * otherwise (calling update on a paused tween still returns true because
         * it is still playing, just paused).
         */
        Tween.prototype.update = function (time, autoStart) {
            if (time === void 0) { time = now$1(); }
            if (autoStart === void 0) { autoStart = true; }
            if (this._isPaused)
                return true;
            var property;
            var elapsed;
            var endTime = this._startTime + this._duration;
            if (!this._goToEnd && !this._isPlaying) {
                if (time > endTime)
                    return false;
                if (autoStart)
                    this.start(time);
            }
            this._goToEnd = false;
            if (time < this._startTime) {
                return true;
            }
            if (this._onStartCallbackFired === false) {
                if (this._onStartCallback) {
                    this._onStartCallback(this._object);
                }
                this._onStartCallbackFired = true;
            }
            if (this._onEveryStartCallbackFired === false) {
                if (this._onEveryStartCallback) {
                    this._onEveryStartCallback(this._object);
                }
                this._onEveryStartCallbackFired = true;
            }
            elapsed = (time - this._startTime) / this._duration;
            elapsed = this._duration === 0 || elapsed > 1 ? 1 : elapsed;
            var value = this._easingFunction(elapsed);
            // properties transformations
            this._updateProperties(this._object, this._valuesStart, this._valuesEnd, value);
            if (this._onUpdateCallback) {
                this._onUpdateCallback(this._object, elapsed);
            }
            if (elapsed === 1) {
                if (this._repeat > 0) {
                    if (isFinite(this._repeat)) {
                        this._repeat--;
                    }
                    // Reassign starting values, restart by making startTime = now
                    for (property in this._valuesStartRepeat) {
                        if (!this._yoyo && typeof this._valuesEnd[property] === 'string') {
                            this._valuesStartRepeat[property] =
                                // eslint-disable-next-line
                                // @ts-ignore FIXME?
                                this._valuesStartRepeat[property] + parseFloat(this._valuesEnd[property]);
                        }
                        if (this._yoyo) {
                            this._swapEndStartRepeatValues(property);
                        }
                        this._valuesStart[property] = this._valuesStartRepeat[property];
                    }
                    if (this._yoyo) {
                        this._reversed = !this._reversed;
                    }
                    if (this._repeatDelayTime !== undefined) {
                        this._startTime = time + this._repeatDelayTime;
                    }
                    else {
                        this._startTime = time + this._delayTime;
                    }
                    if (this._onRepeatCallback) {
                        this._onRepeatCallback(this._object);
                    }
                    this._onEveryStartCallbackFired = false;
                    return true;
                }
                else {
                    if (this._onCompleteCallback) {
                        this._onCompleteCallback(this._object);
                    }
                    for (var i = 0, numChainedTweens = this._chainedTweens.length; i < numChainedTweens; i++) {
                        // Make the chained tweens start exactly at the time they should,
                        // even if the `update()` method was called way past the duration of the tween
                        this._chainedTweens[i].start(this._startTime + this._duration);
                    }
                    this._isPlaying = false;
                    return false;
                }
            }
            return true;
        };
        Tween.prototype._updateProperties = function (_object, _valuesStart, _valuesEnd, value) {
            for (var property in _valuesEnd) {
                // Don't update properties that do not exist in the source object
                if (_valuesStart[property] === undefined) {
                    continue;
                }
                var start = _valuesStart[property] || 0;
                var end = _valuesEnd[property];
                var startIsArray = Array.isArray(_object[property]);
                var endIsArray = Array.isArray(end);
                var isInterpolationList = !startIsArray && endIsArray;
                if (isInterpolationList) {
                    _object[property] = this._interpolationFunction(end, value);
                }
                else if (typeof end === 'object' && end) {
                    // eslint-disable-next-line
                    // @ts-ignore FIXME?
                    this._updateProperties(_object[property], start, end, value);
                }
                else {
                    // Parses relative end values with start as base (e.g.: +10, -3)
                    end = this._handleRelativeValue(start, end);
                    // Protect against non numeric properties.
                    if (typeof end === 'number') {
                        // eslint-disable-next-line
                        // @ts-ignore FIXME?
                        _object[property] = start + (end - start) * value;
                    }
                }
            }
        };
        Tween.prototype._handleRelativeValue = function (start, end) {
            if (typeof end !== 'string') {
                return end;
            }
            if (end.charAt(0) === '+' || end.charAt(0) === '-') {
                return start + parseFloat(end);
            }
            else {
                return parseFloat(end);
            }
        };
        Tween.prototype._swapEndStartRepeatValues = function (property) {
            var tmp = this._valuesStartRepeat[property];
            var endValue = this._valuesEnd[property];
            if (typeof endValue === 'string') {
                this._valuesStartRepeat[property] = this._valuesStartRepeat[property] + parseFloat(endValue);
            }
            else {
                this._valuesStartRepeat[property] = this._valuesEnd[property];
            }
            this._valuesEnd[property] = tmp;
        };
        return Tween;
    }());

    var VERSION = '18.6.4';

    /**
     * Tween.js - Licensed under the MIT license
     * https://github.com/tweenjs/tween.js
     * ----------------------------------------------
     *
     * See https://github.com/tweenjs/tween.js/graphs/contributors for the full list of contributors.
     * Thank you all, you're awesome!
     */
    var nextId = Sequence.nextId;
    /**
     * Controlling groups of tweens
     *
     * Using the TWEEN singleton to manage your tweens can cause issues in large apps with many components.
     * In these cases, you may want to create your own smaller groups of tweens.
     */
    var TWEEN = mainGroup;
    // This is the best way to export things in a way that's compatible with both ES
    // Modules and CommonJS, without build hacks, and so as not to break the
    // existing API.
    // https://github.com/rollup/rollup/issues/1961#issuecomment-423037881
    var getAll = TWEEN.getAll.bind(TWEEN);
    var removeAll = TWEEN.removeAll.bind(TWEEN);
    var add = TWEEN.add.bind(TWEEN);
    var remove = TWEEN.remove.bind(TWEEN);
    var update = TWEEN.update.bind(TWEEN);
    var exports$1 = {
        Easing: Easing,
        Group: Group,
        Interpolation: Interpolation,
        now: now$1,
        Sequence: Sequence,
        nextId: nextId,
        Tween: Tween,
        VERSION: VERSION,
        getAll: getAll,
        removeAll: removeAll,
        add: add,
        remove: remove,
        update: update,
    };

    exports.Easing = Easing;
    exports.Group = Group;
    exports.Interpolation = Interpolation;
    exports.Sequence = Sequence;
    exports.Tween = Tween;
    exports.VERSION = VERSION;
    exports.add = add;
    exports.default = exports$1;
    exports.getAll = getAll;
    exports.nextId = nextId;
    exports.now = now$1;
    exports.remove = remove;
    exports.removeAll = removeAll;
    exports.update = update;

    Object.defineProperty(exports, '__esModule', { value: true });

})));