@datawheel/canon-core/src/middlewares/promiseMiddleware.js

Reusable React environment and components for creating visualization engines.

export default function promiseMiddleware() {
  return next => action => {
    const {promise, type, ...rest} = action;

    if (!promise) return next(action);

    const SUCCESS = `${type}_SUCCESS`;
    const REQUEST = `${type}_REQUEST`;
    const FAILURE = `${type}_FAILURE`;
    next({...rest, type: REQUEST});
    return promise
      .then(res => {
        next({...rest, res, type: SUCCESS});
        return true;
      })
      .catch(error => {
        next({...rest, error, type: FAILURE});
        return false;
      });
  };
}