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Runtime & Modules

process.argv process.env CommonJS require CommonJS exports ES module import ES module export import.meta.url dynamic import

Filesystem

readFile writeFile appendFile mkdir recursive readdir stat createReadStream createWriteStream

Paths & URLs

path.join path.resolve path.extname path.basename URL constructor URLSearchParams fileURLToPath pathToFileURL

Events & Buffers

EventEmitter on emit EventEmitter once Buffer from string Buffer concat Buffer slice TextDecoder Readable stream Transform stream

HTTP

http.createServer Parse request URL Read request body JSON response Status code Response headers Streaming response Abort request

Async & Processes

Promise API async await setImmediate process.nextTick AbortController child_process execFile spawn process worker_threads

Testing & Diagnostics

node:test basic test assert strictEqual mock timer concept process warning console time performance.now unhandledRejection handler uncaughtException monitor

Production

Graceful shutdown Health endpoint Environment config Structured log object Cluster concept Rate-limit concept Cache headers Signal handling

Node.js / Testing & Diagnostics

mock timer concept

Learn mock timer concept in Node.js with a dedicated explanation, a topic-specific example, edge guidance, and a mastery check.

12 min read • Advanced

nodejs-051.js

javascript

// node:test mock timers can control Date/timer behavior in deterministic tests.
import { test } from "node:test"; test("timer boundary",t=>{ console.log(typeof t.mock); });

What to watch

Content source & attribution

Original Syntaxis Content · Original Syntaxis Content

Lesson quizzes

mock timer concept Mastery Check →

assert strictEqual

process warning