watson

const { PassThrough, finished } = require('stream');

console.log('Waiting for stream to finish...');
finished(new PassThrough(), (err) => {
  // This callback is never called and the process exits with exit code 0 right away
  console.log('Stream has finished!', { err });
});

watson

'use strict'

const { Worker } = require('worker_threads')

const worker = new Worker(`
  const { workerData, parentPort } = require('worker_threads')
  const result = workerData.str.match(workerData.regex)
  parentPort.postMessage(result)
`, {
  workerData: {

watson

'use strict'

const asyncHooks = require('async_hooks')

const asyncIds = new Set()

const asyncHook = asyncHooks.createHook({
  init (asyncId, type, triggerAsyncId, resource) {
    const eid = asyncHooks.executionAsyncId()
    process._rawDebug(`${type}(${asyncId}): trigger: ${triggerAsyncId} execution: ${eid}`, resource)

watson

'use strict'

const { Writable } = require('readable-stream')

let stream

console.log('write')
stream = getStream()
stream.write('foo')

watson

'use strict'

const zlib = require('zlib')
const http = require('http')

const body = zlib.gzipSync(JSON.stringify({
  errors: {
    ERR_QUEUE_FULL: {
      count: 23,
      message: 'queue is full'

watson

'use strict'

const http = require('http')

const server = http.createServer(function (req, res) {
  console.log(req.method, req.url)
  res.socket.end() // Half-close the socket by sending FIN packet
})

server.listen(8200, function () {

watson

A setTimeout rabbit hole

setTimeout(function, delay)

docs: https://developer.mozilla.org/en-US/docs/Web/API/WindowOrWorkerGlobalScope/setTimeout

I've always thought that setTimeout would call the function when the delay was up, maybe a little later, but never before.

watson

var assert = require('assert')
var events = require('events')
assert(events.usingDomains)

watson

Write-Host "Preparing to download and install Elasticsearch..." -ForegroundColor Cyan
$esVersion = "6.1.2"
$downloadUrl = "https://artifacts.elastic.co/downloads/elasticsearch/elasticsearch-$($esVersion).zip"
$zipPath = "$($env:USERPROFILE)\elasticsearch-$esVersion.zip"
$extractRoot = "$env:SYSTEMDRIVE\Elasticsearch"
$esRoot = "$extractRoot\elasticsearch-$esVersion"

Write-Host "Downloading Elasticsearch..."
(New-Object Net.WebClient).DownloadFile($downloadUrl, $zipPath)
7z x $zipPath -y -o"$extractRoot" | Out-Null

watson

Write-Host "Downloading Redis..." -ForegroundColor Cyan
$redisRoot = "$env:SYSTEMDRIVE\Redis"
$zipPath = "$($env:USERPROFILE)\redis-2.8.19.zip"
(New-Object Net.WebClient).DownloadFile('https://github.com/MSOpenTech/redis/releases/download/win-2.8.19/redis-2.8.19.zip', $zipPath)
7z x $zipPath -y -o"$redisRoot" | Out-Null
del $zipPath

Write-Host "Installing Redis as a Windows service..."
& "$redisRoot\redis-server.exe" --service-install