Stream (write) a file to disk in Node

file-stream-write.js

const fs = require("fs")

!(async () => {
  const stream = fs.createWriteStream("path/to/file")
  let canWrite = true
  let counter = 0

  // optionally listen for errors
  stream.on("error", error => {
    throw error
  })

  // the `stream.write` function returns a boolean indicating whether or not the
  // stream is ready to write more or not; and by listening for the "drain"
  // event, we can know when it's ready to start writing again
  stream.on("drain", () => {
    canWrite = true
  })

  stream.on("end", () => {
    stream.destroy()
  })

  const interval = setInterval(() => {
    if (!canWrite) return
    canWrite = stream.write(Math.random().toString() + "\n")
    counter++

    if (counter > 100) {
      clearInterval(interval)
      stream.end()
    }
  }, 10)
})()