function isInitializerDescriptor(desc) {
  return !!desc && isFunction(desc.initializer) && isBoolean(desc.configurable) && isBoolean(desc.enumerable) && isBoolean(desc.writable);
}
function isInitializerDescriptor(desc) {
  return !!desc && isFunction(desc.initializer) && isBoolean(desc.configurable) && isBoolean(desc.enumerable) && isBoolean(desc.writable);
}
function isInitializerDescriptor ( desc ) { return ! ! desc && isFunction ( desc . initializer ) && isBoolean ( desc . configurable ) && isBoolean ( desc . enumerable ) && isBoolean ( desc . writable ) ; }
to check if the descirptor is an initiallizer descriptor
@param {descriptor} desc it should be a descriptor better
to check if the descirptor is an initiallizer descriptor