@omneedia/socketcluster/sample/node_modules/is-promise/index.js

SocketCluster - A Highly parallelized WebSocket server cluster to make the most of multi-core machines/instances.

module.exports = isPromise;

function isPromise(obj) {
  return !!obj && (typeof obj === 'object' || typeof obj === 'function') && typeof obj.then === 'function';
}