docs: function getInjectedValue(component, propertyName, source) {
    var value;
    var primitiveDefaults = source.defaultComponentsFromPrimitive || {};
    var aFrameDefaults = source.defaultComponents || {};
    var defaultSources = [primitiveDefaults, aFrameDefaults];
    for (var i = 0; value === undefined && i < defaultSources.length; i++) {
      var defaults = defaultSources[i];
      if (defaults.hasOwnProperty(component.name)) {
        if (!propertyName) {
          value = defaults[component.name];
        } else {
          value = defaults[component.name][propertyName];
        }
      }
    }
    return value;
  }