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Nikita Galkin Love and Know: ▰ How to make developers and business happy ▰ Technical and process debt elimination Believe that: ▰ Any problem must be solved at the right level ▰ Software is easy. People are hard ▰ A problem should be highlighted, an idea should be "sold", a solution should be demonstrated Links: Site GitHub Twitter Facebook 2 

▰ Telegram channel, daily ▰ Voice chat, weekly ▰ Workshops, coming soon 

Today Agenda 1. What is special about Node.js? 2. Node.js v16 features 3. Node.js ecosystem state 4. What to learn? 

What is special about Node.js? 

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Google pays for V8 

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Node.js v16: ECMAScript 

8.4 ➜ 9.4 

1. String.prototype.replaceAll 2. Object.hasOwn 3. ArrayLike.at 4. class static initialization blocks 5. Error cause 6. ... 

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Error cause: 

Node.js v16: Timers Promises API 

// Before function wait(timeout) { return new Promise((r) => setTimeout(r, timeout)); } // Node.js v16 import {setTimeout as wait } from "timers/promises"; async function example() { await wait(5000); console.log('After 500ms'); } example(); 

import { setInterval, } from 'timers/promises'; const interval = 100; for await (const startTime of setInterval(interval, Date.now())) { const now = Date.now(); console.log(now); if ((now - startTime) > 1000) break; } 

Node.js v16: AbortController 

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const http = require('http'); const ac = new AbortController(); const signal = ac.signal; http.request('https://example.org', { signal }, (res) => { /** … **/ }); // Cancel the request! ac.abort(); 

Node.js v16: core modules 

// Before import http from 'http'; // Node.js v16 import http from 'node:http'; 

Node.js v16: Source Maps 

node:net:1420 throw new ERR_SERVER_ALREADY_LISTEN(); ^ Error [ERR_SERVER_ALREADY_LISTEN]: Listen method has been called more than once without closing. at new NodeError (node:internal/errors:371:5) at Server.listen (node:net:1420:11) at Object. (/Users/example.js:10:8) at Module._compile (node:internal/modules/cjs/loader:1101:14) at Object.Module._extensions..js (node:internal/modules/cjs/loader:1153:10) at Module.load (node:internal/modules/cjs/loader:981:32) at Function.Module._load (node:internal/modules/cjs/loader:822:12) at Function.executeUserEntryPoint [as runMain] (node:internal/modules/run_main:81:12) at node:internal/main/run_main_module:17:47 { code: 'ERR_SERVER_ALREADY_LISTEN' } 

// Before npm install source-map-support // Node.js v16 node server.js --enable-source-maps // or use env var NODE_OPTIONS="--enable-source-maps" 

Node.js v16: npm 

Corepack: the Node.js' manager of package managers 

1. npm install as fast as yarn 2. package-lock.json v2 format 3. npm exec 4. workspaces 5. overrides (resolutions from yarn) are in development 

Node.js v16: other 

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AsyncLocalStorage and AsyncResource API are stable now. Perfect use case: tracing 

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Running x86 vs arm64 node resulted in a ~40% improvement. Node.js v16 has darwin-x64 (Intel) and darwin-arm64 (Apple Silicon) builds 

Node.js 16 supports setting process.env.TZ on windows. Farewell set-tz package process.env.TZ = 'UTC' 

Node.js ecosystem 

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- TypeScript - GitHub - npm - Azure Most Affecting Company 

Top Contributor - Fastify - pino - Node - undici 

Open Source Startups Funding ● Gatsby – round B, May 2020, 28m ● Strapi – round A, may 2020, 10m ● Cube Dev – round A, Jul 2021, 15.5m ● Bubble – round A, Jul 2021, 100m ● Apollo – round D, Aug 2021, 130m ● Vercel – round D, Nov 2021, 150m 

What to learn? 

Required by industry ● EcmaScript & TypeScript ● DevOps: CI/CD, IoS, 12factor ● Cloud Native: one of AWS, GCP, Azure and Kubernetes ● Web API: OpenAPI, GraphQL, AsyncAPI, etc 

Required by Business ● Soft Skills (English!) ● Reporting and analytics (Mixpanel) ● Headless CMS ● NoCode: use, integrate or migrate ● Personalization: Internet Of Behavior 

QUESTIONS TIME! Slides at the channel ➡