source: node_modules/recharts/es6/animation/AnimationManager.js@ a762898

/**
 * Represents a single item in the ReactSmoothQueue.
 * The item can be:
 * - A number representing a delay in milliseconds.
 * - An object representing a style change
 * - A StartAnimationFunction that starts eased transition and calls different render
 *      because of course in Recharts we have to have three ways to do everything
 * - An arbitrary function to be executed
 */

export function createAnimateManager(timeoutController) {
  var currStyle;
  var handleChange = () => null;
  var shouldStop = false;
  var cancelTimeout = null;
  var setStyle = _style => {
    if (shouldStop) {
      return;
    }
    if (Array.isArray(_style)) {
      if (!_style.length) {
        return;
      }
      var styles = _style;
      var [curr, ...restStyles] = styles;
      if (typeof curr === 'number') {
        cancelTimeout = timeoutController.setTimeout(setStyle.bind(null, restStyles), curr);
        return;
      }
      setStyle(curr);
      cancelTimeout = timeoutController.setTimeout(setStyle.bind(null, restStyles));
      return;
    }
    if (typeof _style === 'string') {
      currStyle = _style;
      handleChange(currStyle);
    }
    if (typeof _style === 'object') {
      currStyle = _style;
      handleChange(currStyle);
    }
    if (typeof _style === 'function') {
      _style();
    }
  };
  return {
    stop: () => {
      shouldStop = true;
    },
    start: style => {
      shouldStop = false;
      if (cancelTimeout) {
        cancelTimeout();
        cancelTimeout = null;
      }
      setStyle(style);
    },
    subscribe: _handleChange => {
      handleChange = _handleChange;
      return () => {
        handleChange = () => null;
      };
    },
    getTimeoutController: () => timeoutController
  };
}