jsDoc 布道

/** @typedef { 'js' | 'jquery' | 'ts' | 'jsdoc' } phase; */

/**
 * on typing ' editor will popup string list.
 *
 * @type {phase}
 */
const badcase = 'react'; // !!!! lint alert !!!!

/** @type {phase} */
const goodcase = 'jquery';

  "@type": {
    "prefix": ["ty"],
    "body": ["/** @type {$0} */"],
    "description": "jsdoc type"
  },

  "@typedef": {
    "prefix": ["td"],
    "body": ["/** @typedef {$1} foo */"],
    "description": "jsdoc typedef"
  },

import { useMemo, useReducer } from "react";

/**
 * @template T - Payload Type
 * @typedef {T extends { type: infer U, payload?: infer P } ? { type: U, payload?: P } : never} ActionType
 */

/** @template AM - Actions Map @typedef {{ [K in AM['type']]: K }} Labels */

/** @template AM - Actions Map @typedef {{ [T in AM["type"]]: Extract<AM, { type: T }> extends { payload: infer P } ? (payload: P) => void : () => void }} Quack */

/**
 * @template ST - State
 * @template AM - Actions Map
 * @typedef {(state: ST, action: AM) => ST} Reducer
 */

/**
 * Factory function to create a typed action map.
 * @template AM - Actions Map
 * @param {Labels<AM>} labelsObject - The keys representing action labels.
 * @param {function} dispatch - The dispatch function for actions.
 * @return {Quack<AM>} The resulting typed action map.
 */
export const quackFactory = (labelsObject, dispatch) => Object
  .keys(labelsObject)
  .reduce(
    /**
     * @arg {Quack<AM>} acc
     * @arg {keyof Labels<AM>} type
     * @return {Quack<AM>}
     */
    (acc, type) => ({
    ...acc,
    [type]: (payload) => {dispatch({ type, payload });}
  }), {});

/**
 * A factory hook to create a state and a typed dispatch functions\
 * @exports useDuck
 * @template AM - Actions Map
 * @template ST - State Typer
 * @param {(st: ST, action: AM) => ST} reducer - The reducer function to manage the state.
 * @param {ST} initialState - The initial state value.
 * @return {[ST, Quack<AM>]} The current state and a map of action dispatch functions.
 */
export const useDuck = (reducer, initialState, labels) => {
  const [state, dispatch] = useReducer(reducer, initialState);
  const quack = useMemo(
    () => quackFactory(labels, dispatch),
    [dispatch, labels]
  );
  return ([state, quack]);
};