code: function applyProperty(scrollPosition, propertyData, startPosition, duration, style, easing) {
    const {
      startValue,
      endValue,
      property,
      unit,
    } = propertyData;
  
    // If property is one of the color properties
    // Use it's parallax method
    const isColor = COLOR_PROPERTIES.indexOf(property) > -1;
    const parallaxMethod = isColor ? colorParallax : parallax;
  
    // Get new CSS value
    const value = parallaxMethod(
      scrollPosition,
      startPosition,
      duration,
      startValue,
      endValue,
      easing
    );
  
    // Get transform function
    const transformMethod = TRANSFORM_MAP[property];
    const filterMethod = FILTER_MAP[property];
    const newStyle = style;
  
    if (transformMethod) {
      // Get CSS unit
      const propertyUnit = getUnit(property, unit);
      // Transforms, apply value to transform function
      newStyle.transform[property] = transformMethod(value, propertyUnit);
    } else if (filterMethod) {
      // Get CSS unit
      const propertyUnit = getUnit(property, unit);
      // Filters, apply value to filter function
      newStyle.filter[property] = filterMethod(value, propertyUnit);
    } else {
      // All other properties
      newStyle[property] = value;
  
      // Add unit if it is passed
      if (unit) {
        newStyle[property] += unit;
      }
    }
  
    return newStyle;
  }
docs: Applies property parallax to the style object