redux-code/es/reducer.js

Redux helpers for actions and reducers

/* eslint-disable @typescript-eslint/ban-ts-comment */
// @ts-nocheck
import produce, { isDraft, isDraftable } from 'immer'
import { combineReducers } from 'redux'
/**
 *
 * A helper to create reducer (uses immer)
 * @param initial The initial state
 */
export const createReducer = function (initial, ...mixins) {
  const reducer = createBaseReducer(initial, ...mixins)
  return function (state = initial, action) {
    if (isDraft(state) || !isDraftable(state)) return reducer(state, action)
    return produce(state, (draft) => reducer(draft, action))
  }
}
/**
 *
 * A helper to create reducer (without immer)
 * @param initial The initial state
 */
export const createBaseReducer = function (initial, ...mixins) {
  const reducers = Object.assign({}, ...mixins)
  return function (state = initial, action) {
    const producer = reducers[action.type]
    if (producer) state = producer(state, action)
    return state
  }
}
const isPlainObject = (v) =>
  !!v && typeof v === 'object' && (v.__proto__ === null || v.__proto__ === Object.prototype)
export const buildStructuredReducer = function (reducer) {
  if (isPlainObject(reducer)) {
    const combined = Object.fromEntries(
      Object.entries(reducer).map(([key, value]) => [key, buildStructuredReducer(value)]),
    )
    return combineReducers(combined)
  }
  return reducer
}