@wordpress/redux-routine/build-module/runtime.js

Redux middleware for generator coroutines.

/**
 * External dependencies
 */

import { create } from 'rungen';
import isPromise from 'is-promise';
/**
 * Internal dependencies
 */
import { isActionOfType, isAction } from './is-action';

/**
 * Create a co-routine runtime.
 *
 * @param controls Object of control handlers.
 * @param dispatch Unhandled action dispatch.
 */
export default function createRuntime(controls = {}, dispatch) {
  const rungenControls = Object.entries(controls).map(([actionType, control]) => (value, next, iterate, yieldNext, yieldError) => {
    if (!isActionOfType(value, actionType)) {
      return false;
    }
    const routine = control(value);
    if (isPromise(routine)) {
      // Async control routine awaits resolution.
      routine.then(yieldNext, yieldError);
    } else {
      yieldNext(routine);
    }
    return true;
  });
  const unhandledActionControl = (value, next) => {
    if (!isAction(value)) {
      return false;
    }
    dispatch(value);
    next();
    return true;
  };
  rungenControls.push(unhandledActionControl);
  const rungenRuntime = create(rungenControls);
  return action => new Promise((resolve, reject) => rungenRuntime(action, result => {
    if (isAction(result)) {
      dispatch(result);
    }
    resolve(result);
  }, reject));
}
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