redux-promise-thunk/examples/todo-mvc/node_modules/history/es6/runTransitionHook.js

Thunk generator to dispatch Flux-Standard-Action in each phase of promise

'use strict';

import warning from 'warning';

function runTransitionHook(hook, location, callback) {
  var result = hook(location, callback);

  if (hook.length < 2) {
    // Assume the hook runs synchronously and automatically
    // call the callback with the return value.
    callback(result);
  } else {
    process.env.NODE_ENV !== 'production' ? warning(result === undefined, 'You should not "return" in a transition hook with a callback argument; call the callback instead') : undefined;
  }
}

export default runTransitionHook;