vant-reduce/dist/index.js

const fs = require('fs')
const path = require('path')
console.log(process.cwd())
console.log("process.cwd()")
let allVantFiles = fs.readdirSync(path.join(process.cwd(), 'static', 'vant'))
let PathArr = new Set(['/vant/common/', '/vant/wxs/', '/vant/mixins/'])
let PromiseArray = []
let wxJson = { wxJson: [] }

function getJson(ens) {
  let reg = /\/main\.(j|t)s/
  for (let [key, path] of ObjectYeild(ens)) {
    if (key !== 'app') {
      PromiseArray.push(getPromise(path.replace(reg, '/main.json')))
    }
  }
  return PromiseArray
}

function getPromise(path, isT) {
  let reg = isT ? /\.\.(\/.*)index$/ : /.*static(\/vant\/.*\/).*/
  let str = isT ? '/' : ''
  return new Promise((resolve, reject) => {
    fs.readFile(path, (err, data) => {
      if (err) {
        return resolve('cuowu')
      }
      data = JSON.parse(data.toString())
      if (data && data.usingComponents && Object.keys(data.usingComponents).length) {
        for (let [key, url] of ObjectYeild(data.usingComponents)) {
          !isT && reg.exec(url) && PathArr.add(`${reg.exec(url)[1].trim()}`)
          isT && reg.exec(url) && PathArr.add(`/vant${reg.exec(url)[1].trim()}`)
        }
      }
      resolve()
    })
  })
}
function* ObjectYeild(obj) {
  for (let key of Object.keys(obj)) {
    yield [key, obj[key]]
  }
}

function fnSelf(arr, recordArr) {
  let Promise_arr = []
  for (let value of arr) {
    Promise_arr.push(getPromise(path.join(process.cwd(), 'static', `${value}/index.json`), true))
  }
  Promise.all(Promise_arr).then(() => {
    let resArr = recordArr[recordArr.length - 1]
    if (resArr.length === PathArr.size) return getDirRes(PathArr)
    let resSet = new Set([...PathArr].filter(val => {
      return !resArr.includes(val)
    }))
    Object.assign(recordArr, {
      [recordArr.length]: [...PathArr]
    })
    fnSelf([...resSet], recordArr)
  })
}

function getDirRes(needFileArray) {
  wxJson.wxJson = new Set(allVantFiles.filter(x => !needFileArray.has(`/vant/${x}/`)))
  wxJson.wxJson = [...wxJson.wxJson].map(val => path.join(process.cwd(), 'dist/wx/static/vant', val))
  return wxJson
}

function vantStartCheck(entry) {
  Promise.all(getJson(entry)).then((res) => {
    let recordArr = []
    Object.assign(recordArr, {
      [recordArr.length]: [...PathArr]
    })
    fnSelf([...PathArr], recordArr)
  }).catch((res) => {

  })
  return wxJson
}

module.exports = {
  vantStartCheck
}