Redux routine creator utility - async action types and action creators

createAction.js

/* Generates an action creator FSA compliant
 * Based on 'redux-actions' createAction method
 * https://github.com/acdlite/redux-actions/blob/master/src/createAction.js
*/
export default function createAction (type, payloadTransform, metaTransform) {
  return (...args) => {
    const action = { type }
    const payload =
      args[0] instanceof Error || typeof payloadTransform !== 'function'
        ? args[0]
        : payloadTransform(...args)

    if (payload instanceof Error) action.error = true
    if (payload !== undefined) action.payload = payload
    if (typeof metaTransform === 'function') {
      action.meta = metaTransform(...args)
    }
    return action
  }
}

createRoutine.js

import createAction from './createAction'
/*
 * Utility to create async routine action creators and action types
 * Creates a ${prefix}_TRIGGER, ${prefix}_REQUEST, ${prefix}_SUCCESS,
 * ${prefix}_FAILURE, ${prefix}_FULLFILL
 *
 * Returns an object containing the action types and creators
 */
const suffixes = ['TRIGGER', 'REQUEST', 'SUCCESS', 'FAILURE', 'FULLFILL']

export default function createRoutine (
  prefix = '',
  payloadTransform,
  metaTransform
) {
  prefix = prefix.toUpperCase()
  return suffixes.reduce((acc, suffix) => {
    const type = `${prefix}_${suffix}`

    // Uppercase properties should denote the action type
    acc[suffix] = type

    // Lowercase properties should denote the action creators
    acc[suffix.toLowerCase()] = createAction(
      type,
      payloadTransform,
      metaTransform
    )
    return acc
  }, {})
}