platform/video.videojs/dist/video.es.js
function mergeOptions() {
  var result = {};

  for (var _len = arguments.length, sources = Array(_len), _key = 0; _key < _len; _key++) {
    sources[_key] = arguments[_key];
  }

  sources.forEach(function (source) {
    if (!source) {
      return;
    }

    each(source, function (value, key) {
      if (!isPlain(value)) {
        result[key] = value;
        return;
      }

      if (!isPlain(result[key])) {
        result[key] = {};
      }

      result[key] = mergeOptions(result[key], value);
    });
  });

  return result;
}
function mergeOptions() {
  var result = {};

  for (var _len = arguments.length, sources = Array(_len), _key = 0; _key < _len; _key++) {
    sources[_key] = arguments[_key];
  }

  sources.forEach(function (source) {
    if (!source) {
      return;
    }

    each(source, function (value, key) {
      if (!isPlain(value)) {
        result[key] = value;
        return;
      }

      if (!isPlain(result[key])) {
        result[key] = {};
      }

      result[key] = mergeOptions(result[key], value);
    });
  });

  return result;
}
@file merge-options.js
@module merge-options
 
Deep-merge one or more options objects, recursively merging **only** plain
object properties.

@param   {Object[]} sources
One or more objects to merge into a new object.

@returns {Object}
A new object that is the merged result of all sources.