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

Redux middleware for generator coroutines.

/**
 * Internal dependencies
 */
import isGenerator from './is-generator';
import createRuntime from './runtime';

/**
 * Creates a Redux middleware, given an object of controls where each key is an
 * action type for which to act upon, the value a function which returns either
 * a promise which is to resolve when evaluation of the action should continue,
 * or a value. The value or resolved promise value is assigned on the return
 * value of the yield assignment. If the control handler returns undefined, the
 * execution is not continued.
 *
 * @param {Record<string, (value: import('redux').AnyAction) => Promise<boolean> | boolean>} controls Object of control handlers.
 *
 * @return {import('redux').Middleware} Co-routine runtime
 */
export default function createMiddleware(controls = {}) {
  return store => {
    const runtime = createRuntime(controls, store.dispatch);
    return next => action => {
      if (!isGenerator(action)) {
        return next(action);
      }
      return runtime(action);
    };
  };
}
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