javascript - 编译后的 typescript 和 vanilla javascript 之间的内存使用情况不同

Question

当我编译与普通 JavaScript 代码完全相同的 typescript 代码时，当代码运行时，内存使用量会增加，直到崩溃。普通 javascript 代码内存使用量始终保持不变。

代码连接到 mqtt 代理，然后读入文件并将文件中的每一行作为 mqtt 消息发布。

typescript 代码:

import { createReadStream } from 'fs'
import { split, mapSync } from 'event-stream'
import { connect } from 'mqtt'

const client = connect('mqtt://localhost:1883')

client.on('connect', () => {
  let lineNr = 0
  const stream = createReadStream('<PATH_TO_LARGE_FILE>')
    .pipe(split())
    .pipe(mapSync(async line => {

      // pause the readstream
      stream.pause()

      lineNr++

      if(lineNr % 1000 === 0)
        console.log(`${lineNr}\t${process.memoryUsage().heapTotal / 1048576}`)


      await new Promise((resolve, reject) => {
        client.publish('/standardized', line.toString(), () => {
          resolve()
        })
      })

      stream.resume()
    })
      .on('error', function(err){
        console.log('Error while reading file.', err)
        stream.destroy()
      })
      .on('end', function(){
        console.log('Read entire file')
        stream.destroy()
      })
    )
})

普通 JavaScript:

const { createReadStream } = require('fs')
const { split, mapSync } = require('event-stream')
const { connect } = require('mqtt')

const client = connect('mqtt://localhost:1883')

client.on('connect', () => {
  let lineNr = 0
  const stream = createReadStream('<PATH_TO_LARGE_FILE>')
    .pipe(split())
    .pipe(mapSync(async line => {

      // pause the readstream
      stream.pause()

      lineNr++

      if(lineNr % 1000 === 0)
        console.log(`${lineNr}\t${process.memoryUsage().heapTotal / 1048576}`)


      await new Promise((resolve, reject) => {
        client.publish('/standardized', line.toString(), () => {
          resolve()
        })
      })

      stream.resume()
    })
      .on('error', function(err){
        console.log('Error while reading file.', err)
        stream.destroy()
      })
      .on('end', function(){
        console.log('Read entire file')
        stream.destroy()
      })
    )
})

预期:编译后的 typescript 代码的内存使用量也应保持不变 实际:编译后的 typescript 代码的内存使用量不断增加，直到代码崩溃

Answer 1

让它工作，它确实是一个“错误的”tsconfig(其中有目标:“es6”，将其更改为“ESNext”)。谢谢大家的评论!