redux-store-wrapper.js

/* eslint-disable import/prefer-default-export */
import * as R from 'ramda';

/**
 * @curried
 * @param {Object} reducer The simplified reducer object, i.e. { increment: (state, payload) => state + payload }
 * @param {Object} initialState Initial state for the reducer function
 * @returns {Function} Generalized reducer using the Ramda Cond pattern (http://ramdajs.com/docs/#cond)
 */
export const reducerWrapper = (reducer, initialState) => (state = initialState, action) => R.pipe(
  R.mapObjIndexed((func, type) => [
    R.pipe(
      R.prop('type'),
      R.equals(type),
    ),
    ({ payload }) => func(payload)(state),
  ]),
  R.values,
  R.append([R.T, R.always(state)]),
  R.call(R.cond),
)(reducer)(action);

/**
 * @curried
 * @param {String} type Redux action type (usually referencing types.js)
 * @param {Any} payload Payload for specified function
 * @returns {Object} Redux action (with type and payload)
 */
export const wrapActionPayload = type => R.pipe(
  R.objOf('payload'),
  R.assoc('type', type),
);