interactjs/src/utils/pointerExtend.js

Drag and drop, resizing and multi-touch gestures with inertia and snapping for modern browsers (and also IE8+)

function pointerExtend (dest, source) {
  for (const prop in source) {
    const prefixedPropREs = module.exports.prefixedPropREs;
    let deprecated = false;

    // skip deprecated prefixed properties
    for (const vendor in prefixedPropREs) {
      if (prop.indexOf(vendor) === 0 && prefixedPropREs[vendor].test(prop)) {
        deprecated = true;
        break;
      }
    }

    if (!deprecated && typeof source[prop] !== 'function') {
      dest[prop] = source[prop];
    }
  }
  return dest;
}

pointerExtend.prefixedPropREs = {
  webkit: /(Movement[XY]|Radius[XY]|RotationAngle|Force)$/,
};

module.exports = pointerExtend;