有些代码不适合在运行时计算,在编译时运算会更安全。而且还可以结合nodejs端做更强的代码整合。 之前有在webpack通过自定义loader去导出编译后的代码。但那种无法传递结构化的参数。只能通过url形式
使用
npm i -D @dxyl/babel-macro-util
该库基于babel-plugin-macros
create-react-app脚手架生成的项目自带引用了babel-plugin-macros
// 用法
import {mul} from '@dxyl/babel-macro-util/lib/util.macro'
let value=12;
let a=mul(2,value)
//解析后
let value=12;
let a=24
其它构建工具用到babel时,在babel配置项中添加babel-plugin-macros
即可
.babelrc
{
"plugins":["babel-plugin-macros"]
}
场景
index.js
import store from './store'
ReactDOM.render(
<React.StrictMode>
<Provider store={store}>
<App></App>
</Provider>
</React.StrictMode>,
document.getElementById('root')
);
slices/global.js
export default {
name:"global",
initialState:{
theme:"default2",
count:0
},
reducers:{
setTheme(state,action){
state.theme=action.payload
},
setCount(state,action){
state.count+=action.payload
}
},
asyncReducers:{
async addCount(action,thunkAPI){
await new Promise(resolve=>{
setTimeout(resolve,2000)
})
thunkAPI.dispatch({
type:"global/setCount",
payload:action.payload*10
})
}
},
extraReducers: builder => {
}
}
store.js
import {configureStore,createAsyncThunk,createSlice,getDefaultMiddleware} from '@reduxjs/toolkit'
import { requireGlob } from '@dxyl/babel-macro-util/util.macro'
const allSlices=requireGlob('./slices/*.js');
let createStoreFactory=(slices)=>{
let stores={}
let reducers={}
let asyncReducer=new Map()
let middlewares=[]
let asyncMiddleWare=({getState,dispatch})=>next=>action=>{
let type=action.type
if(asyncReducer.has(type)){
let fn=asyncReducer.get(type).fn
return dispatch(fn(action))
}else{
return next(action)
}
}
function create(sliceConfig){
let sliceStore=createSlice(sliceConfig)
if(sliceConfig.asyncReducers){
Object.keys(sliceConfig.asyncReducers).forEach(name=>{
let type=sliceStore.name+'/'+name
asyncReducer.set(type,{
namspace:sliceStore.name,
name:name,
type:type,
fn:((oldFn)=>{
let ops={}
if(Array.isArray(oldFn)){
ops=oldFn[1]
oldFn=oldFn[0]
}
let asyncFn=createAsyncThunk(type,async (action,thunkApi)=>{
let result=await oldFn(action,thunkApi)
return result
},ops)
return (action)=>{
let asyncDispatch=asyncFn(action)
return (dispatch,getState)=>{
let promise=asyncDispatch(dispatch,getState)
let p=Promise.resolve(promise).then((result)=>{
if(asyncFn.fulfilled.type===result.type){
return result.payload
}else if(asyncFn.rejected.type==result.type){
return Promise.reject(result)
}else{
return Promise.reject(result)
}
})
Object.assign(p,promise)
return p;
}
}
})(sliceConfig.asyncReducers[name])
})
})
}
reducers[sliceStore.name]=sliceStore.reducer
stores[sliceStore.name]=sliceStore
return sliceStore
}
function addMiddlewares(...fns){
middlewares.push(...fns)
}
slices.forEach(create)
addMiddlewares(...getDefaultMiddleware())
addMiddlewares(asyncMiddleWare)
return {
stores,
reducers,
create,
addMiddlewares,
middlewares:middlewares,
createStore(options={}){
return configureStore ({
middleware:middlewares,
reducer:reducers,
...options
})
}
}
}
export default createStoreFactory(allSlices.map(slice=>slice.ref['default'])).createStore()
app.js
import React from 'react';
import {useSelector,useDispatch} from 'react-redux'
import './App.css';
function UpdateTheme(){
const dispatch=useDispatch()
const onChange=(e)=>{
dispatch({
type:"global/setTheme",
payload:e.target.value
})
}
const onAdd=()=>{
dispatch({
type:"global/addCount",
payload:10
}).then((result)=>{
console.log('result',result)
})
}
return <div><button onClick={onAdd}>add</button><input onChange={onChange}/></div>
}
function App() {
let global=useSelector(state=>state.global)
return (
<div className="App">
theme2:{global.theme}{global.count}
<UpdateTheme></UpdateTheme>
</div>
);
}
export default App;
自定义宏文件
cust.macro.js
import {createMacroHandle,PluginManager,macroPlugin,convertToJsObject} from '@dxyl/babel-macro-util'
let custMacroPlugin=new PluginManager(macroPlugin.plugins)//继承
custMacroPlugin.add('mul',(currentPath, babel, state) => {
const t = babel.types
const args = currentPath.get('arguments').map(convertToJsObject)
currentPath.replaceWith(t.valueToNode(args[0]*args[1]))
}))
export default createMacroHandle(custMacroPlugin)
util
自定义添加方法
import {macroPlugin,convertToJsObject} from '@dxyl/babel-macro-util'
macroPlugin.add('mul',(currentPath, babel, state) => {
const t = babel.types
const args = currentPath.get('arguments').map(convertToJsObject)
currentPath.replaceWith(t.valueToNode(args[0]*args[1]))
}))
匹配模式加载模块
import {configureStore} from '@reduxjs/toolkit'
import { requireGlob } from '@dxyl/babel-macro-util/util.macro'
let reducers=requireGlob('./reducers/**/*.js');
reducers=reducers.reduce((memo,reducers)=>{
reducers=reducers.ref['default']
return {
...memo,
...reducers
}
},{})
let sliceReducers=requireGlob('./slices/**/*.js');
sliceReducers=sliceReducers.reduce((memo,slice)=>{
slice=slice.ref['default']
return {
...memo,
[slice.name]:slice.reducer
}
},{})
const store= configureStore ({
reducer:{
...reducers,
...sliceReducers
}
})
export default store
requireProperties 加载模块
const config = [{
path: "/",
component: "src/layouts/BasicLayout",
routes: [{
path: "/",
redirect: "/home",
}, {
path: "/home",
component: "src/App"
}]
}]
const routes = requireProperties(config,['component'])
// 编译后
const config = [{
path: "/",
component: "src/layouts/BasicLayout",
routes: [{
path: "/",
redirect: "/home",
}, {
path: "/home",
component: "src/App"
}]
}]
const routes = [{
path: "/",
component: require("src/layouts/BasicLayout"),
routes: [{
path: "/",
redirect: "/home",
}, {
path: "/home",
component: require("src/App")
}]
}]
evalCode
const files=evalCode(`
const fs=require('fs)
module.exports=fs.readdirSync('./src')
`,{sourceString:false})
sourceString:true
const routes=evalCode(`
let routes=[{
path:"/",
component:"src/layouts/BasicLayout",
routes:[{
path:"/",
component:"src/layouts/BasicLayout",
}]
}]
module.exports=JSON.stringify(routes,(key,value)=>{
if(key==='component'&&typeof value ==='string'){
return 'require(\\''+value+'\\')'
}
return value
},2).replace(/"component":\\s*"require\\((.*?)\\)"/g,'"component":require($1)')
`,{sourceString:true})
evalCode
const files=evalCode(`
const fs=require('fs)
module.exports=fs.readdirSync('./src')
`,{sourceString:false})
sourceString:true
const routes=evalCode(`
let routes=[{
path:"/",
component:"src/layouts/BasicLayout",
routes:[{
path:"/",
component:"src/layouts/BasicLayout",
}]
}]
module.exports=JSON.stringify(routes,(key,value)=>{
if(key==='component'&&typeof value ==='string'){
return 'require(\\''+value+'\\')'
}
return value
},2).replace(/"component":\\s*"require\\((.*?)\\)"/g,'"component":require($1)')
`,{sourceString:true})