Function decay

Libraries/Animated/src/AnimatedImplementation.js:2112–2149

(
  value: AnimatedValue | AnimatedValueXY,
  config: DecayAnimationConfig,
)

};

var decay = function(
  value: AnimatedValue | AnimatedValueXY,
  config: DecayAnimationConfig,
): CompositeAnimation {
  var start = function(
    animatedValue: AnimatedValue | AnimatedValueXY,
    configuration: DecayAnimationConfig,
    callback?: ?EndCallback): void {
      callback = _combineCallbacks(callback, configuration);
      var singleValue: any = animatedValue;
      var singleConfig: any = configuration;
      singleValue.stopTracking();
      singleValue.animate(new DecayAnimation(singleConfig), callback);
  };

  return maybeVectorAnim(value, config, decay) || {
    start: function(callback?: ?EndCallback): void {
      start(value, config, callback);
    },

    stop: function(): void {
      value.stopAnimation();
    },

    reset: function(): void {
      value.resetAnimation();
    },

    _startNativeLoop: function(iterations?: number): void {
      var singleConfig = { ...config, iterations };
      start(value, singleConfig);
    },

    _isUsingNativeDriver: function(): boolean {
      return config.useNativeDriver || false;
    }
  };
};

var sequence = function(
  animations: Array<CompositeAnimation>,