@wordpress/data/build-module/promise-middleware.js

Data module for WordPress.

/**
 * External dependencies
 */
import isPromise from 'is-promise';

/**
 * Simplest possible promise redux middleware.
 *
 * @type {import('redux').Middleware}
 */
const promiseMiddleware = () => next => action => {
  if (isPromise(action)) {
    return action.then(resolvedAction => {
      if (resolvedAction) {
        return next(resolvedAction);
      }
    });
  }
  return next(action);
};
export default promiseMiddleware;
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