ECMAScript News Feed

Node.js 16; alternative to Babel; non-JS-based JS tooling; TC39 meeting; Guy Bedford interview

Dr. Axel Rauschmayer and Johannes Weber — Tue, 27 Apr 2021 08:02:00 GMT

Node.js 16 available now

Sucrase: fast alternative to Babel (written in TypeScript)

JavaScript tooling not written in JavaScript

Updates from 82nd meeting of TC39 (19–22 April 2021)

TC39 Podcast: Guy Bedford (jspm, SystemJS, …) [19-min. audio]

Babel 7.14.0; Temporal API; future of Node.js; optimizing JS via compilation; cloning objects; parseInt() puzzle

Dr. Axel Rauschmayer and Johannes Weber — Tue, 04 May 2021 08:02:00 GMT

Babel 7.14.0: new class features enabled by default, TypeScript 4.3, and better CommonJS interop

ECMAScript Temporal API in 2 minutes

What’s next: the future of Node.js [28-min. video]

An optimizing compiler: JavaScript to C++ to faster JavaScript

Cloning JavaScript objects with graph theory

Solving a mystery behavior of parseInt()

Rome Tools, Inc.; esbuild-based tool; import maps; base 10 values; implementing private fields; Node.js shell scripts; SpiderMonkey logo and website; using Promises correctly

Dr. Axel Rauschmayer and Johannes Weber — Tue, 11 May 2021 08:02:00 GMT

Announcing Rome Tools, Inc.

Hammer: build tool for browser and Node.js applications (based on esbuild)

JSPM Generator: package import map generation tool

Decimal (base 10) values for JavaScript [38-min. video]

Implementing private fields for JavaScript

zx: tool and library for Node.js-based shell scripts

SpiderMonkey (Firefox’s JavaScript and WebAssembly engine) now has a logo and a website

Broken Promises: how to use Promises correctly [34-min. video]

TC39 meeting; V8 v9.1; Prettier 2.3; Deno 1.10; dependency managers; funding Babel

Dr. Axel Rauschmayer and Johannes Weber — Tue, 18 May 2021 08:02:00 GMT

TC39 meeting, April 19-21 2021

V8 v9.1: top-level `await`, private field checks, etc.

Prettier 2.3: assignments are consistent, short keys non-breaking, Handlebars official

Are you up to date on ECMAScript 2021? The book “JavaScript for impatient programmers” explains what’s new (Sponsor)

Deno 1.10: improved test runner, structured clone in Web Workers, Web Storage API, remote import maps

Dependency managers don’t manage dependencies (updating dependencies, detecting unused dependencies, etc.)

Babel is used by millions, so why are we running out of money?

Parcel 2 beta 3; Babel moves to ESM; private field checks; code consistency in Node.js; interview TC39er Mike Samuel

Dr. Axel Rauschmayer and Johannes Weber — Tue, 25 May 2021 08:02:00 GMT

Parcel 2 beta 3: 10× faster JS compilation, implemented in Rust

Helping Babel move to ECMAScript modules

Ergonomic brand checks [for private fields] will ship with Firefox 90

Introduction to Node.js reference architecture, part 3: code consistency

TC39er Podcast: interview with Mike Samuel [22-min. audio]

Are you up to date on ECMAScript 2021? The book “JavaScript for impatient programmers” explains what’s new (Sponsor)

New compiler in V8; TC39 meeting; CSS Weekly; Array method cheat sheet; interview TC39er Daniel Ehrenberg

Dr. Axel Rauschmayer and Johannes Weber — Tue, 01 Jun 2021 08:02:00 GMT

Sparkplug: non-optimizing JavaScript compiler [new part of V8 engine]

Updates from May 2021 meeting of TC39

CSS Weekly (Partner)

A cheat sheet for Array methods

TC39er Podcast: interview with Daniel Ehrenberg [40-min. audio]

OpenJS World talks; running JS on WebAssembly; promises & Node.js performance; implementing private fields; webpack federation; WebAssembly for JS developers

Dr. Axel Rauschmayer and Johannes Weber — Tue, 08 Jun 2021 08:02:00 GMT

OpenJS World 2021: descriptions and recordings of talks

Making JavaScript run fast on WebAssembly

Global Scope, the brand new, 100% JavaScript global online conference, coming July (Sponsor)

Optimise Node.js performance by avoiding broken promises

Implementing private fields for JavaScript

A quick look at webpack module federation

Introduction to WebAssembly for JavaScript developers

ES2021; Deno 1.11; Ryan Dahl on Deno; interview TC39er Tierney Cyren

Dr. Axel Rauschmayer and Johannes Weber — Tue, 15 Jun 2021 08:02:00 GMT

ECMAScript 2021: What’s next for JavaScript?

Deno 1.11: official Docker images, abortable fetch, more web crypto APIs, stable deno lint, BroadCastChannel, TextEncoderStream & TextDecoderStream

Exploring Deno Land with Ryan Dahl [77-min. audio]

Global Scope, the brand new, 100% JavaScript global online conference, coming July (Sponsor)

TC39er Podcast: interview with Tierney Cyren [23-min. audio]

Bundler for Deno; import assertions; chaining errors; JSON modules; podcast with Yulia Startsev; interview TC39er Tab Atkins-Bittner

Dr. Axel Rauschmayer and Johannes Weber — Tue, 22 Jun 2021 08:02:00 GMT

Packup: web application bundler for Deno, inspired by Parcel

ECMAScript proposal “import assertions”

ECMAScript proposal: Error cause (chaining errors)

ECMAScript proposal: JSON modules

Global Scope, the brand new, 100% JavaScript global online conference, coming July (Sponsor)

JS Party Podcast: Mozilla’s Yulia Startsev on compilers, Firefox, TC39, and more [70-min. audio]

TC39er Podcast: interview with Tab Atkins-Bittner [23-min. audio]

ES2021 officially standardized; Temporal date time API; asynchronous context tracking; using webpack with esbuild; canceling fetch(); podcast on testing with Angie Jones

Dr. Axel Rauschmayer and Johannes Weber — Tue, 29 Jun 2021 08:02:00 GMT

ECMAScript 2021 is officially a standard now

Free online: a comprehensive book on ECMAScript 2021 (Sponsor)

Temporal: getting started with JavaScript’s new date time API

New in Node.js: asynchronous context tracking

webpack or esbuild: Why not both?

How to cancel pending fetch() requests

Global Scope, the brand new, 100% JavaScript global online conference, coming July (Sponsor)

JS Party Podcast: Testing testing 1 2 3 with Angie Jones [58-min. audio]

ESLint v7.30.0; ESM preloading & integrity; Web Workers in 2021; Object.hasOwn(); checking for private fields; search parameters & form data

Dr. Axel Rauschmayer and Johannes Weber — Tue, 06 Jul 2021 08:02:00 GMT

ESLint v7.30.0 released

ES Module preloading and integrity

Global Scope, the brand new, 100% JavaScript global online conference, coming July (Sponsor)

The state of Web Workers in 2021

ECMAScript proposal: Accessible Object.prototype.hasOwnProperty()

ECMAScript proposal: Ergonomic brand checks for private fields

Encoding and decoding data for POST requests (search parameters, form data)

Vite v2.4.0; pnpm vs. Yarn 2

Dr. Axel Rauschmayer and Johannes Weber — Tue, 13 Jul 2021 08:02:00 GMT

Vite v2.4.0 [build tool]

pnpm is my successor to Yarn 1

Global Scope, the brand new, 100% JavaScript global online conference, coming July (Sponsor)

JavaScript on WebAssembly; Node.js v16.5.0 with Web Streams; array method .at(); Vite frontend tooling; TC39 meeting; interview TC39er Yulia Startsev

Dr. Axel Rauschmayer and Johannes Weber — Tue, 20 Jul 2021 08:02:00 GMT

JS Party Podcast: JavaScript on WebAssembly [51-min. audio]

Node.js v16.5.0: experimental Web Streams API and more

.at() method for relative indexing

Global Scope, the brand new, 100% JavaScript global online conference, coming July (Sponsor)

Vite: rethinking frontend tooling [31-min. video]

Updates from July 2021 meeting of TC39

TC39er Podcast: interview with Yulia Startsev [27-min. audio]

Yarn 3.0; AbortController and AbortSignal; then(f,f) vs then(f).catch(f); Spring Cleaning MDN

Dr. Axel Rauschmayer and Johannes Weber — Tue, 27 Jul 2021 08:02:00 GMT

Yarn 3.0: performance, esbuild, better patches, and more

Cancelling asynchronous operations in the Node.js via AbortController and AbortSignal

What third-party scripts are on your website? Grab your Free Website Inventory Report (Sponsor)

JavaScript Promises: then(f,f) vs then(f).catch(f)

Stefan’s Web Weekly (Partner)

Spring Cleaning MDN: content management switches from a wiki to GitHub

Node.js 16.9.0; ES Module Shims 1.0.0; Rome written in Rust; run third-party scripts in web workers; TC39 meeting

Dr. Axel Rauschmayer and Johannes Weber — Tue, 28 Sep 2021 08:02:00 GMT

Node.js 16.9.0: Corepack (configure package managers via package.json), V8 9.3 (Object.hasOwn, error cause), and more

ES Module Shims import maps polyfill 1.0.0

The tool suite Rome will be written in Rust

Introducing Partytown: run third-party scripts from a web worker

Updates from August 2021 meeting of TC39

Vite 2.6.0; web streams; Retool

Dr. Axel Rauschmayer and Johannes Weber — Tue, 05 Oct 2021 08:02:00 GMT

Vite 2.6.0

Web streams everywhere (and fetch for Node.js)

Meet Retool—The Fastest Way To Build Internal Tools (Sponsor)

ESLint v8.0.0; Immutable.js 4.0.0; nvm 0.39.0; Retool; Microbundle 0.14.0; Rollup tutorial; sorting arrays

Dr. Axel Rauschmayer and Johannes Weber — Tue, 12 Oct 2021 08:02:00 GMT

ESLint 8.0.0: better support for ES2022, automatically fix unused disable directives, new rule options, and more

Immutable.js 4.0.0: better TypeScript and Flow type definitions, all collections are now iterable, .toJSON(), and more

nvm 0.39.0: support for npm 8, better Windows support, and more

Meet Retool—The Fastest Way To Build Internal Tools (Sponsor)

Microbundle 0.14.0 [bundler for tiny modules]: support for Module Workers

The ultimate guide to getting started with the Rollup.js JavaScript bundler

Sorting JavaScript arrays by nested properties

Parcel 2 (bundler); benchmark runner; Deno 1.15; Retool; Pino 7 (Node.js logger); import assertions

Dr. Axel Rauschmayer and Johannes Weber — Tue, 19 Oct 2021 08:02:00 GMT

Parcel 2: support for plugins, faster performance, automatic code splitting, image optimization, and more

Tachometer: statistically rigorous benchmark runner for the web

Deno 1.15: new crypto APIs, deno uninstall, deno lint --watch, nested testing API, and more

Retool is the fast way to build internal tools

Pino 7 [low-overhead JSON logger for Node.js]: worker_thread transport

ES.next: import assertions (JSON modules, CSS modules, …)

Node.js 17; ESLint 8.10.0; fetch(); interview TC39er J. S. Choi; NodeConf Remote videos

Dr. Axel Rauschmayer and Johannes Weber — Tue, 26 Oct 2021 08:02:00 GMT

Node.js 17 is here!

ESLint 8.10.0: no-unused-private-class-members and bug fixes

Retry, timeout and cancel with fetch()

GIMTEC, a newsletter to become a better software engineer (Sponsor)

TC39er Podcast: interview with J. S. Choi [32-min. audio]

Video playlist: NodeConf Remote (18–21 October 2021)

Babel 7.16.0; Yarn 3.1; new and experimental in Node.js; programming language security; Unicode segmentation; async code tips

Dr. Axel Rauschmayer and Johannes Weber — Tue, 02 Nov 2021 09:02:00 GMT

Babel 7.16.0: ESLint 8 and TypeScript 4.5

Yarn 3.1: Node.js Corepack Integration, Plug’n’Play supports ESM, pnpm install mode, ...

OpenJS World 2021 keynote recap: Node.js – the new and the experimental

GIMTEC, a weekly newsletter to grow as a software engineer. (Sponsor)

Programming language security and JavaScript

Unicode segmentation in JavaScript

4 essential tips for better asynchronous code in JavaScript

V8 release v9.7; TC39 meeting in October; interview TC39er Nicolò Ribaudo

Dr. Axel Rauschmayer and Johannes Weber — Tue, 09 Nov 2021 09:02:00 GMT

V8 release v9.7: array.findLast(), array.findLastIndex()

Updates from October 2021 meeting of TC39

TC39er Podcast: interview with Nicolò Ribaudo [22-min. audio]

SpiderMonkey news; ESLint’s inception; Rust for JS infrastructure; Node v17.1.0; Deno 1.16

Dr. Axel Rauschmayer and Johannes Weber — Tue, 16 Nov 2021 09:02:00 GMT

SpiderMonkey newsletter (Firefox 94–95, JavaScript engine)

The inception of ESLint

Rust is the future of JavaScript infrastructure [opinion]

This Week in React (Partner)

Node v17.1.0: JSON import assertions and more

Deno 1.16: fetch() for file URLs, JSX transforms, signal listener API, error.cause displayed in console, Deno to npm package build tool, and more

Browser for ES proposals; ESLint 8.3.0; interview TC39er Jack Works

Dr. Axel Rauschmayer and Johannes Weber — Tue, 23 Nov 2021 09:02:00 GMT

Proposals.es: browser for ECMAScript proposals

ESLint 8.3.0: support for class static blocks (ES2022) and more

TC39er Podcast: interview with Jack Works [26-min. audio]

Advent of JavaScript; Prettier 2.5; Retool; IndexedDB is slow

Dr. Axel Rauschmayer and Johannes Weber — Tue, 30 Nov 2021 09:02:00 GMT

Advent of JavaScript: 24 challenges for the season

Prettier 2.5: TypeScript 4.5 and MDX v2 comment syntax

Meet Retool—The Fastest Way To Build Internal Tools (Sponsor)

Why IndexedDB is slow and what to use instead

Book “Impatient JS ES2022”; book “Understanding JS Promises”; ES modules via packages; sorting arrays

Dr. Axel Rauschmayer and Johannes Weber — Tue, 18 Jan 2022 09:02:00 GMT

ES2022 edition of “JavaScript of impatient programmers” (free online)

Free ebook: “Understanding JavaScript Promises”

Publishing and consuming ECMAScript modules via packages – the big picture

Sorting arrays in JavaScript

Deno 1.18; grouping arrays; caching and promises

Dr. Axel Rauschmayer and Johannes Weber — Tue, 25 Jan 2022 09:02:00 GMT

Deno 1.18: complete Web Cryptography API, auto-discovery of deno.json, Error.cause displayed in all stack traces, and more

ECMAScript proposal: grouping Arrays via .groupBy() and .groupByToMap()

Mixing promises and async/await for caching in JavaScript

Deno in 2021; TC39 meeting in January; pipe operator; finding Node.js bottlenecks; npm package dependency trees

Dr. Axel Rauschmayer and Johannes Weber — Mon, 31 Jan 2022 09:01:00 GMT

Deno in 2021

Updates from January 2022 meeting of TC39

Free online: comprehensive book on ECMAScript 2022 (Sponsor)

A pipe operator for JavaScript: introduction and use cases

Find bottlenecks in Node.js apps with Clinic Flame

Node-secure: analyze dependency tree of an npm package (tool plus API)

Babel 7.17.0; JSON Schema joins OpenJS Foundation; cost of immutability; retrying via fetch() and AbortSignal; security and sustainability of npm packages

Dr. Axel Rauschmayer and Johannes Weber — Mon, 07 Feb 2022 09:01:00 GMT

Babel 7.17.0: decorators and RegExp /v flag (set notation & properties of strings)

JSON Schema joins OpenJS Foundation

Medusa: Open source Shopify alternative in JS (Sponsor)

Immutability isn’t free

Using fetch(), AbortSignal, and setTimeout() to apply retry mechanics in JavaScript

JS Party podcast: What’s in your package.json? [Security and sustainability of npm packages]

Node.js 17.5.0; Vite 2.8.0; web APIs in Deno

Dr. Axel Rauschmayer and Johannes Weber — Tue, 15 Feb 2022 09:02:00 GMT

Node.js 17.5.0: fetch() (behind flag), unflagged JSON imports, new stream methods

Vite 2.8.0: esbuild 0.14, TypeScript 4.5, standard pattern for creating workers, configurable worker bundling, reduced footprint

Small team, Big plans: Hiring Kind & Curious People to Support Financial Identity (Sponsor)

A list of every web API in Deno

“State of JS 2021” survey; Yarn 3.2; Deno 1.19; wrapper objects; JS—Node.js vs. browsers

Dr. Axel Rauschmayer and Johannes Weber — Tue, 22 Feb 2022 09:02:00 GMT

The results of the “State of JS 2021” survey

Lead Frontend Engineer at Cycle.app (Sponsor)

Yarn 3.2: yarn explain and more

Deno 1.19: vendoring (storing dependencies locally), permission prompt is default, files/sockets/stdio are web streams

Small team, Big plans: Hiring Kind & Curious People to Support Financial Identity (Sponsor)

What are wrapper objects for primitive values?

Comparing Node.js JavaScript to JavaScript in the browser

Publishing Deno modules to npm

Dr. Axel Rauschmayer and Johannes Weber — Mon, 28 Feb 2022 09:01:00 GMT

How to publish Deno modules to npm

Lead Frontend Engineer at Cycle.app (Sponsor)

Get paid for your feedback, join Wynter's research panel (Sponsor)

MDN redesign; ShadowRealms; properties of primitives; controling Promise concurrency; detecting malicious npm packages

Dr. Axel Rauschmayer and Johannes Weber — Mon, 07 Mar 2022 09:01:00 GMT

A new year, a new MDN

Future JavaScript: ShadowRealms

Two-day conference of powerful tech talks to build with Strapi. (Sponsor)

How do primitive values get their properties?

Node.js: executing at most N Promise-based tasks at the same time

The funniest web dev newsletter on the internet. (Sponsor)

Introducing Socket [service that detects malicious npm packages via static and dynamic analysis]

Type annotations; WebGPU; npm package `-`; console-based debugging; name clashes with proposed features

Dr. Axel Rauschmayer and Johannes Weber — Tue, 15 Mar 2022 09:02:00 GMT

A proposal for type syntax in JavaScript

WebGPU – all of the cores, none of the canvas

Empty npm package - has over 700,000 downloads – here’s why

Console-based debugging in JavaScript: beyond console.log()

JavaScript naming conflicts: How existing code can force proposed features to be renamed

StructuredClone(); fetch() in Node.js core; Safari 15.4; Deno 1.20

Dr. Axel Rauschmayer and Johannes Weber — Tue, 22 Mar 2022 09:02:00 GMT

Deep clone values with structuredClone()

fetch() in Node.js core: Why you should care

New JavaScript features in Safari 15.4: array.findLast(), array.findLastIndex(), .at(), Object.hasOwn()

The funniest web dev newsletter on the internet. (Sponsor)

Deno 1.20: deno bench, deno task, import maps in config files, and more

Searching Arrays backwards; importing JSON; AbortSignal.timeout(); parceljs; MDN Plus

Dr. Axel Rauschmayer and Johannes Weber — Mon, 28 Mar 2022 08:01:00 GMT

ECMAScript proposal: searching Arrays from end to start via .findLast() and .findLastIndex()

Import JSON in ES modules on Node.js

Automatically cancel async operations with AbortSignal.timeout()

Parcel v2.4.0: Parcel CSS becomes default CSS processor

Introducing MDN Plus [paid subscription service with additional features]

TC39 meeting in March; new Node.js features; Locale-aware sorting; built-in test runner for Node.js; supply chain security

Dr. Axel Rauschmayer and Johannes Weber — Mon, 04 Apr 2022 08:01:00 GMT

Updates from TC39 meeting in March 2022

What’s new in Node.js core? March 2022 edition

The funniest web dev newsletter on the internet. (Sponsor)

Locale-aware sorting in JavaScript

A built-in test runner is coming to Node.js and why you should care

Making moves on supply chain security – with Feross & Socket team [64-min. audio]

Formatter for JS & TS; `ShadowRealm` – a better `eval()`; shim for Import Maps; ESLint rules for async code

Dr. Axel Rauschmayer and Johannes Weber — Tue, 12 Apr 2022 08:02:00 GMT

Rome Formatter, a new formatter for JavaScript and TypeScript

ShadowRealms – an ECMAScript proposal for a better eval()

How ES Module Shims became a production Import Maps polyfill

14 ESLint rules to help you write asynchronous code in JavaScript

Prefix-only Node.js core modules; new Array methods; JS runtime for WebAssembly; Types as comments

Dr. Axel Rauschmayer and Johannes Weber — Tue, 19 Apr 2022 08:02:00 GMT

Node.js 18 introduces prefix-only core modules [pseudo-protocol node: is mandatory]

ECMAScript proposal “Change Array by copy”: four new non-destructive Array methods

Capture the Flag 101 Workshop: Solve your first CTF hacking challenge (Sponsor)

Javy: running JavaScript in a runtime on WebAssembly

Types as comments with the TypeScript team [83-min. video]

Deno 1.21; Node.js 18; interview about Node.js 18; Parcel v2.5.0; faster class instantiation in V8; Test Anything Protocol (TAP) v14

Dr. Axel Rauschmayer and Johannes Weber — Tue, 26 Apr 2022 08:02:00 GMT

Deno 1.21: moving away from type checking before running code and more

Add 70+ refactorings for JavaScript to Visual Studio Code (Sponsor)

Learn everything about tech salaries in 2022 with talent.io's Tech Salary Report (Sponsor)

Node.js 18 is now available!

Beth Griggs & Michael Dawson talk about the Node.js 18 release [5½-min. video]

Parcel v2.5.0

V8: faster initialization of public fields, private fields and private methods in instances of classes

Test Anything Protocol (TAP) v14: subtests, pragmas and more

EOL of Node.js 12; npm 8.8.0; building bundler; ShadowRealm

Dr. Axel Rauschmayer and Johannes Weber — Tue, 03 May 2022 08:02:00 GMT

Node.js 12, the last non-ESM version, reaches end-of-life

Add 70+ refactorings for JavaScript to Visual Studio Code (Sponsor)

npm 8.8.0

Looking for Frontend Lead at Series A Company (Sponsor)

Wireit enables more features for package.json scripts and runs them efficiently

Building a JavaScript bundler

Meet Retool—The Fastest Way To Build Internal Tools (Sponsor)

Introducing ShadowRealm

Nrwl will maintain Lerna; Node.js monorepo tools; 4 tools for monorepos; Node.js 18.1.0; ESLint 8.15.0; triple dot syntax

Dr. Axel Rauschmayer and Johannes Weber — Mon, 09 May 2022 08:01:00 GMT

Passing Lerna’s torch to Nrwl

Which monorepo tool is right for a Node.js backend?

Four tools to efficiently manage your JavaScript monorepo

Add 70+ refactorings for JavaScript to Visual Studio Code (Sponsor)

Meet Retool—The Fastest Way To Build Internal Tools (Sponsor)

Node.js 18.1.0: initial CLI test runner

ESLint v8.15.0 released

The triple dot syntax (...) in JavaScript: rest vs. spread

Community Group for non-browser JS platforms; universal JavaScript; JavaScript containers; Jest joins OpenJS Foundation; esbuild

Dr. Axel Rauschmayer and Johannes Weber — Tue, 17 May 2022 08:02:00 GMT

WinterCG: Community Group for web-interoperable JavaScript runtimes

The road to universal JavaScript

JavaScript as a platform for containers

Add 70+ refactorings for JavaScript to Visual Studio Code (Sponsor)

5 ways to prevent code injection in JavaScript and Node.js (Sponsor)

Meta Open Source is transferring Jest to the OpenJS Foundation

A deep dive into esbuild

Babel 7.18.0; ESLint v8.16.0; Deno 1.22; JavaScript MIME type; property paths

Dr. Axel Rauschmayer and Johannes Weber — Tue, 24 May 2022 08:02:00 GMT

Babel 7.18.0: destructuring private elements and TypeScript 4.7

Full-Stack role for developing health software in Germany (m/f/d) (Sponsor)

ESLint v8.16.0 released

Build internal tools 10x faster with Retool (Sponsor)

Deno 1.22 release notes

RFC 9239: Updates to ECMAScript media types

Library “Wild Wild Path”: accessing properties via key paths

Parcel v2.6.0; Lerna 5; processing Arrays non-destructively; managing local dependencies; converting libraries from Node.js to Deno

Dr. Axel Rauschmayer and Johannes Weber — Tue, 31 May 2022 08:02:00 GMT

Parcel v2.6.0

Lerna 5

Looking for Frontend Lead at Series A Company (Sponsor)

Full-Stack role for developing health software in Germany (m/f/d) (Sponsor)

Processing Arrays non-destructively: for-of vs. .reduce() vs. .flatMap()

relative-deps: managing local dependencies without the limitations of npm/yarn link

How we converted our Node.js library to Deno (using Deno)

Node v18.3.0; processing Arrays non-destructively; managing local dependencies; converting libraries from Node.js to Deno

Dr. Axel Rauschmayer and Johannes Weber — Thu, 02 Jun 2022 08:04:00 GMT

Node v18.3.0 (current): util.parseArgs() and more

Processing Arrays non-destructively: for-of vs. .reduce() vs. .flatMap()

DevSecCon24 is back for 2022! (Sponsor)

relative-deps: managing local dependencies without the limitations of npm/yarn link

How we converted our Node.js library to Deno (using Deno)

Node v18.3.0; logging and error handling; monorepos; Node.js testing; Wasm in JS ecosystem

Dr. Axel Rauschmayer and Johannes Weber — Tue, 07 Jun 2022 08:02:00 GMT

Node v18.3.0 (current): util.parseArgs() and more

Add 85+ code assists and refactorings to Visual Studio Code (Sponsor)

DevSecCon24 is back for 2022! (Sponsor)

JS Party podcast: logging and error handling [72-minute audio]

Monorepos in JavaScript and TypeScript

Japa: backend-focused Node.js testing framework

WebAssembly in the JavaScript ecosystem [31-minute video]

TC39 meeting in June; Rome Tools 0.6.0; aborting asynchronous tasks; querying node_modules

Dr. Axel Rauschmayer and Johannes Weber — Tue, 14 Jun 2022 08:02:00 GMT

Updates from TC39 meeting in June 2022

Rome Tools 0.6.0

Build internal tools 10x faster with Retool (Sponsor)

AbortController is your friend [aborting asynchronous tasks in JavaScript]

qnm: CLI utility for querying the node_modules directory

Prettier 2.7; Deno 1.23; web streams; block statements; statically transform module specifiers

Dr. Axel Rauschmayer and Johannes Weber — Tue, 21 Jun 2022 08:02:00 GMT

Prettier 2.7: new --cache CLI option and TypeScript 4.7 syntax

Deno 1.23: no type-checking by default (deno run, deno eval, deno cache) and more

Add 90+ code assists and refactorings to Visual Studio Code (Sponsor)

Using web streams on Node.js

The JavaScript block statement

Use esm-import-transformer for “isomorphic-ish” ECMAScript modules

ECMAScript 2022; block statements; void 0

Dr. Axel Rauschmayer and Johannes Weber — Tue, 28 Jun 2022 08:02:00 GMT

Ecma International approves ECMAScript 2022: What’s new?

Secretary General of Ecma International (host of TC39) (Sponsor)

In defense of blocks for local scopes

Build internal tools 10x faster with Retool (Sponsor)

You don’t need void 0 in JavaScript

JavaScript trademark; Babel 7.19.0; Rome Tools 0.9.0; npm supply chain security; package scripts

Dr. Axel Rauschmayer and Johannes Weber — Tue, 13 Sep 2022 08:02:00 GMT

Dear Oracle, please release the JavaScript trademark

Babel 7.19.0: Stage 3 decorators and more RegExp features

Rome Tools 0.9.0

npm best practices for the supply chain

Running cross-platform tasks via npm package scripts

TC39 meeting

Dr. Axel Rauschmayer and Johannes Weber — Tue, 20 Sep 2022 08:02:00 GMT

Updates from TC39 meeting in September 2022

Ezno JS compiler; ESLint v8.24.0; import maps; JS landscape

Dr. Axel Rauschmayer and Johannes Weber — Tue, 27 Sep 2022 08:02:00 GMT

Sneak peek at Ezno, a JavaScript compiler with type checking and type-enabled optimizations

New book – free online: “Shell scripting with Node.js” by Axel Rauschmayer (Sponsor)

ESLint v8.24.0 released

Everything you need to know about JavaScript import maps

The JavaScript landscape is exciting again

Deno 1.26; JS → C++ → WebAssembly; name-importing from CommonJS

Dr. Axel Rauschmayer and Johannes Weber — Tue, 04 Oct 2022 08:02:00 GMT

Deno 1.26 Release Notes

I turned JS into a compiled language (for fun and Wasm)

How to write CommonJS exports that can be name-imported from ESM

Querying package dependencies

Dr. Axel Rauschmayer and Johannes Weber — Tue, 11 Oct 2022 08:02:00 GMT

Use npm query and jq to dig into your package dependencies [5:32-min. video]

New book – free online: “Shell scripting with Node.js” by Axel Rauschmayer (Sponsor)

Node v18.11.0; Rollup 3; Lerna v6; nvm v0.39.2; pnpm

Dr. Axel Rauschmayer and Johannes Weber — Tue, 18 Oct 2022 08:02:00 GMT

Node v18.11.0

Rollup 3

Lerna reborn – what’s new in v6?

nvm v0.39.2

What is pnpm and is it really so fast and space-efficient?

ES proposal “Type Annotations”; ESLint v8.26.0; ESLint in practice; ViteConf 2022 videos; Nordic.js 2022 videos

Dr. Axel Rauschmayer and Johannes Weber — Tue, 25 Oct 2022 08:02:00 GMT

Typed JavaScript? For real? The “type annotations” proposal and what it’s all about [26-min. video]

ESLint v8.26.0 released

ESLint use at Cesium through years of a changing ecosystem

[Videos] ViteConf 2022: 42 talks about tools and frameworks in the Vite ecosystem

[Videos] Nordic.js 2022: 28 talks about JavaScript

Turbopack bundler; Babel 7.20.0; npm v9.0.0; Deno 1.27; ahead-of-time compilation for JS

Dr. Axel Rauschmayer and Johannes Weber — Tue, 01 Nov 2022 09:02:00 GMT

Turbopack: incremental bundler, optimized for JavaScript and TypeScript, written in Rust

Babel 7.20.0: Deno target and TypeScript 4.9

npm v9.0.0 released

Deno 1.27: major IDE improvements

Of JavaScript ahead-of-time compilation performance [36-min. video]

Turbopack vs. Vite; ESLint v8.27.0

Dr. Axel Rauschmayer and Johannes Weber — Tue, 08 Nov 2022 09:02:00 GMT

Is Turbopack really 10 times faster than Vite?

ESLint v8.27.0 released

New book – free online: “Shell scripting with Node.js” by Axel Rauschmayer (Sponsor)

Rome v10; Parcel v2.8.0; TAP formatter for node:test; pnpm v7.15.0; npm v9.0.0; Safari Technology Preview 157

Dr. Axel Rauschmayer and Johannes Weber — Tue, 15 Nov 2022 09:02:00 GMT

Announcing Rome v10

Parcel v2.8.0

μtap: TAP formatter that works well with the built-in Node.js test runner

pnpm v7.15.0

npm v9.0.0 released

Safari Technology Preview 157

Deno 1.28; Node v19.1.0; ESLint v8.28.0; Jest; Lerna

Dr. Axel Rauschmayer and Johannes Weber — Tue, 22 Nov 2022 09:02:00 GMT

Deno 1.28: stable support for npm

Node v19.1.0 (current)

ESLint v8.28.0 released

Learn why Jest breaks the instanceof operator

Lerna Reborn [25-min. video]

Prettier 2.8; RegExp flag /v; internationalizing numbers; rewrite of ESLint; realms

Dr. Axel Rauschmayer and Johannes Weber — Tue, 29 Nov 2022 09:02:00 GMT

Prettier 2.8: improved --cache CLI option and TypeScript 4.9 satisfies operator

ECMAScript proposal: RegExp flag /v makes character classes and character class escapes more powerful

How to internationalize numbers with JavaScript

Complete rewrite of ESLint

What is a realm in JavaScript?

TC39 meeting November; ESLint v8.29.0; typing import statements; error handling; making libraries faster

Dr. Axel Rauschmayer and Johannes Weber — Mon, 05 Dec 2022 09:01:00 GMT

Updates from the TC39 meeting in November 2022

ESLint v8.29.0 released

Capture the Flag 101 Workshop: Solve your first CTF hacking challenge (Sponsor)

Tips for typing import statements in JavaScript

modern-errors: handle errors in a simple, stable, consistent way

Speeding up the JavaScript ecosystem – one library at a time

Npm code explorer; Vite 4.0; Rome v11; ES proposal “iterator helpers”; new Ecma members

Dr. Axel Rauschmayer and Johannes Weber — Tue, 13 Dec 2022 09:02:00 GMT

Explore the content of your npm packages with the new code explorer

Upgrade VS Code with additional code actions, mass refactoring, improvement suggestions, and more. (Sponsor)

Vite 4.0 is out

Announcing Rome v11

ECMAScript proposal: iterator helpers

Ecma International welcomes new members: Shopify, Vercel, and others

Linting npm packages; Node.js 18.13.0; ESLint 8.31.0; 2022 for pnpm

Dr. Axel Rauschmayer and Johannes Weber — Tue, 10 Jan 2023 09:02:00 GMT

Publint: linting npm packages

Node.js 18.13.0 (LTS)

This Week in React (Sponsor)

ESLint 8.31.0 released

The year 2022 for pnpm

Esbuild v0.17.0; plans for Turbopack; ESLint 2022 review; unhandled promise rejections; runtime environment keys

Dr. Axel Rauschmayer and Johannes Weber — Tue, 17 Jan 2023 09:02:00 GMT

esbuild v0.17.0

The Turbopack vision

ESLint’s 2022 year in review

The gotcha of unhandled promise rejections

Runtime keys: proposal defining standard identifier keys for various runtime environments

Bun v0.5; manipulating URLs; speeding up JavaScript

Dr. Axel Rauschmayer and Johannes Weber — Tue, 24 Jan 2023 09:02:00 GMT

Bun v0.5

What's next for developers in 2023? (Sponsor)

Safer URL reading and writing in modern JavaScript

Speeding up the JavaScript ecosystem – module resolution

Esbuild v0.17.5; ESLint v8.33.0; Deno 1.30

Dr. Axel Rauschmayer and Johannes Weber — Sun, 29 Jan 2023 09:07:00 GMT

esbuild v0.17.5

ESLint v8.33.0 released

Deno 1.30: built-in Node.js modules

TC39 meeting January; Node v19.6.0; Vite 4.1.0; Go-like channels in JS; performance-optimizing ESLint

Dr. Axel Rauschmayer and Johannes Weber — Mon, 20 Feb 2023 09:01:00 GMT

Updates from the TC39 meeting in January 2023

Node v19.6.0 (Current)

Vite 4.1.0

Go-like channel in 10 lines of JavaScript

Speeding up the JavaScript ecosystem – ESLint

10% discount for Axel’s JavaScript books (Sponsor)

MDN Web Docs; Sorting arrays; JS on WebAssembly; free “JavaScript Allongé” download

Dr. Axel Rauschmayer and Johannes Weber — Mon, 20 Feb 2023 09:01:00 GMT

A shared and open roadmap for MDN Web Docs

Why sorting is harder than it seems

Show open-source some love! Join The Big Fix (Sponsor)

Bringing JavaScript to WebAssembly for Shopify Functions

Free PDF download of “JavaScript Allongé”

JS without build tools; single-executable applications via Node.js; RegExps and streamed text; Well-known symbols

Dr. Axel Rauschmayer and Johannes Weber — Mon, 20 Feb 2023 09:01:00 GMT

Writing JavaScript without a build system

RxDB - A fast, offline-first, reactive database for JavaScript Applications (Sponsor)

Merged into Node.js: support for single-executable applications

Let’s make JavaScript RegExps streamy

Well-known symbols in JavaScript

Babel 7.21.0; ESLint 8.35.0; esbuild 0.17.10; Lerna 6.5; Turborepo 1.8; Node.js 19.7.0; Deno 1.31; beyond JSON.stringify/parse; import maps

Dr. Axel Rauschmayer and Johannes Weber — Tue, 28 Feb 2023 09:02:00 GMT

New versions of tools

Babel 7.21.0: inline RegExp modifiers, TypeScript 5.0, and decorators updates

ESLint v8.35.0 released

Time for a change? Emerging cybersecurity startup seeks JavaScript talent (Sponsor)

esbuild v0.17.10

What’s new with Lerna 6.5?

Turborepo 1.8: workspace configurations, automatic workspace scoping, easier migrations

New versions of platforms

Node.js v19.7.0 (current): initial support for single executable applications

Deno 1.31: package.json support

Libraries and technologies

Devalue: (de)serialization beyond JSON.stringify/parse

JavaScript import maps, part 1: introduction

Lodash replacements; loading modules into web workers; types for JSON; import maps

Dr. Axel Rauschmayer and Johannes Weber — Tue, 07 Mar 2023 09:02:00 GMT

Lodash replacements: code snippets that are roughly equivalent to Lodash’s functions

Detect and block JavaScript supply chain attacks (Sponsor)

Concurrent.js: load modules into web workers, access them asynchronously

Time for a change? Emerging cybersecurity startup seeks JavaScript talent (Sponsor)

quicktype: generate types and converters from JSON, JSON Schema, and GraphQL for many programming languages

JavaScript import maps, part 2: in-depth exploration

All ES2020+ features; new Rust-based JS bundler; making let/const faster

Dr. Axel Rauschmayer and Johannes Weber — Tue, 14 Mar 2023 09:02:00 GMT

All JavaScript and TypeScript Features of the last 3 years

Announcing Rspack: Rust-based JavaScript bundler

Narrowing the speed gap between let/const and var in V8

Time for a change? Emerging cybersecurity startup seeks JavaScript talent (Sponsor)

Safe npm install; Vite 4.2.0; Turbowatch (Nodemon alternative); Node.js permission model; optimizing npm scripts

Dr. Axel Rauschmayer and Johannes Weber — Mon, 20 Mar 2023 09:01:00 GMT

Introducing “safe npm”, an npm wrapper by Socket

Vite 4.2.0

RunJS - The JavaScript Playground for your Desktop

Turbowatch: fast file change detector and task orchestrator for Node.js

Time for a change? Emerging cybersecurity startup seeks JavaScript talent (Sponsor)

Node.js security progress report: permission model merged

Speeding up the JavaScript ecosystem – npm scripts

Safe npm install; Vite 4.2.0; Turbowatch (Nodemon alternative); Node.js permission model; optimizing npm scripts

Dr. Axel Rauschmayer and Johannes Weber — Mon, 20 Mar 2023 09:01:00 GMT

Introducing “safe npm”, an npm wrapper by Socket

Vite 4.2.0

RunJS - The JavaScript Playground for your Desktop (Sponsor)

Turbowatch: fast file change detector and task orchestrator for Node.js

Time for a change? Emerging cybersecurity startup seeks JavaScript talent (Sponsor)

Node.js security progress report: permission model merged

Speeding up the JavaScript ecosystem – npm scripts

TC39 meeting March; esbuild v0.17.14; why package.json in Deno; `eslint-community` GitHub organization

Dr. Axel Rauschmayer and Johannes Weber — Tue, 28 Mar 2023 08:02:00 GMT

Updates from the TC39 meeting in March 2023

esbuild v0.17.14

RunJS - The JavaScript Playground for Rapid Prototyping (Sponsor)

Why we added package.json support to Deno

Announcing the eslint-community GitHub organization

Safari 16.4; pnpm v8.1.0; Rome v12; import maps in all major browsers; es-module-shims

Dr. Axel Rauschmayer and Johannes Weber — Tue, 04 Apr 2023 08:02:00 GMT

New JavaScript Features in Safari 16.4

Detect and block JavaScript supply chain attacks (Sponsor)

pnpm v8.1.0

Time for a change? Emerging cybersecurity startup seeks JavaScript talent (Sponsor)

Announcing Rome v12

Import maps

JavaScript import maps are now supported cross-browser

es-module-shims: new ES modules features on top of basic modules support in browsers

Import map management tool; Vite 4.3 performance; set operations via bigints

Dr. Axel Rauschmayer and Johannes Weber — Tue, 11 Apr 2023 08:02:00 GMT

JSPM CLI relaunch: import map package management tool

Vite 4.3 performance benchmark

Get your free Retool Database: a managed PostgreSQL DB + spreadsheet-like data editor (Sponsor)

Fast set operations via bigints

MDN page titles; SpiderMonkey; Socket `npm` wrapper; Deno third party module registry

Dr. Axel Rauschmayer and Johannes Weber — Tue, 18 Apr 2023 08:02:00 GMT

The great renaming of MDN’s Web APIs documentation

SpiderMonkey Newsletter (Firefox 112–113)

Time for a change? Emerging cybersecurity startup seeks JavaScript talent (Sponsor)

Socket npm wrapper feedback update

What every developer should know about the Deno third party module registry

Node.js 20; npm package provenance; Vite 4.3; ESLint v8.39.0; event loop

Dr. Axel Rauschmayer and Johannes Weber — Tue, 25 Apr 2023 08:02:00 GMT

Node.js 20 is now available

Introducing npm package provenance

Learn more about the JavaScript ecosystem (Sponsor)

Vite 4.3 is out

ESLint v8.39.0 comes with performance improvements

Picking the right tool for maneuvering JavaScript’s event loop

JS on Wasm; Deno 1.33; custom Node.js test reporter

Dr. Axel Rauschmayer and Johannes Weber — Tue, 02 May 2023 08:02:00 GMT

Will JavaScript become the most popular WebAssembly language?

Deno 1.33: built-in KV database and more

Learn how to build a custom reporter for Node.js’ new native test runner

WebGPU in Chrome 113; ESLint v8.40.0; Node v20.1.0; npm package signatures; Nx 16

Dr. Axel Rauschmayer and Johannes Weber — Tue, 09 May 2023 08:02:00 GMT

New in Chrome 113: WebGPU API

ESLint v8.40.0 released

Node v20.1.0 (Current)

npm packages are no longer signed with PGP signatures

Nx 16 [“smart, fast and extensible build system”]

ECMAScript 2023; analyze V8 performance; Rome v12.1.0

Dr. Axel Rauschmayer and Johannes Weber — Tue, 16 May 2023 08:02:00 GMT

The new JavaScript features coming in ECMAScript 2023

Introducing Deopt Explorer for V8

Rome v12.1.0: stage 3 decorators, VCS support, new lint rules and more

Private fields vs. proxies; Node v20.2.0; Bun v0.6.0; TC39 meeting May; ESM-CJS interop; Node.js performance; Javy: JS on Wasm

Dr. Axel Rauschmayer and Johannes Weber — Tue, 23 May 2023 08:02:00 GMT

Private fields, proxies: pick one, you can’t have both

Node v20.2.0 (current): test.skip(), test.only() and more

Bun v0.6.0: bundler, minifier, standalone executables and more

Updates from the TC39 meeting in May 2023

ESM-CJS interop test: Node.js, Babel, Webpack, Rollup, esbuild

State of Node.js performance 2023

Javy: JavaScript to WebAssembly toolchain

Parcel v2.9.0; npm provenance; try esbuild online

Dr. Axel Rauschmayer and Johannes Weber — Tue, 30 May 2023 08:02:00 GMT

Parcel v2.9.0: package exports, ESM-based plugins and configs, incremental symbol propagation and more

npm provenance: How to get a simple and secure release pipeline

Try esbuild online

Esbuild v0.18.0; Turborepo 1.10; Bun v0.6.8; when not to use template literals; ESLint guide; TC39 panel; software supply chain

Dr. Axel Rauschmayer and Johannes Weber — Tue, 13 Jun 2023 08:02:00 GMT

esbuild v0.18.0

Turborepo 1.10

Bun v0.6.8

JavaScript’s backtick strings are likely the wrong tool for your job

ESLint guide: how to use it with confidence

TC39 Panel – JavaScript inside out: How is your favorite programming language being created? [37-min. video]

Tidelift: Why is everyone talking about the software supply chain? And a chat with open source maintainer Jordan Harband [37-minute video]

CDN for npm packages; securing the open source supply chain; esbuild 0.18.1; ESLint v8.43.0; Firefox 115; Test262 runner

Dr. Axel Rauschmayer and Johannes Weber — Tue, 20 Jun 2023 08:02:00 GMT

esm.sh: content delivery network for single ES modules built from npm packages or GitHub repositories

🌟 What's Next for Developers in 2023! 🚀 (Sponsor)

Do your part to secure the open source supply chain

esbuild 0.18.1

ESLint v8.43.0 released

New JavaScript features in Firefox 115

test262.fyi: daily runner of test262 for many engines

WinterCG; esbuild v0.18.5 & v0.18.7; Nx Ecosystem CI

Dr. Axel Rauschmayer and Johannes Weber — Tue, 27 Jun 2023 08:02:00 GMT

Advancing web runtime interoperability with WinterCG

esbuild v0.18.5 & v0.18.7

Introducing Nx Ecosystem CI

New ECMAScript standards; ECMAScript proposals; ESLint v8.44.0; npm supply chain attack

Dr. Axel Rauschmayer and Johannes Weber — Tue, 04 Jul 2023 08:02:00 GMT

Ecma International approves three new ECMAScript standards

What’s next for JavaScript: new features to look forward to

Developer Nation survey - 25th edition live now (Sponsor)

ESLint v8.44.0 released

The massive bug at the heart of the npm ecosystem

Future of JS standards; Prettier 3.0; Vite 4.4.0; Firefox 115.0; Node v20.4.0; Deno 1.35; Nx 16.5; performance.timeOrigin

Dr. Axel Rauschmayer and Johannes Weber — Tue, 11 Jul 2023 08:02:00 GMT

Beyond browsers: the long-term future of JavaScript standards

Prettier 3.0: Hello, ECMAScript Modules!

Vite 4.4.0

Firefox 115.0 with new JavaScript features

Node v20.4.0 (current): mock timers, explicit resource management and more

Deno 1.35: fast and convenient way to build web servers

Nx 16.5 Release

performance.timeOrigin: When a millisecond is not a millisecond

TC39 meeting July; ESLint configuration migration; JS-to-Wasm toolchain; JSNation 2023 talks

Dr. Axel Rauschmayer and Johannes Weber — Tue, 18 Jul 2023 08:02:00 GMT

Updates from the TC39 meeting in July 2023

ESLint configuration migration guide (from eslintrc to flat format)

Learn more about the JavaScript ecosystem (Sponsor)

Javy: JavaScript-to-WebAssembly toolchain

Videos of the JSNation 2023 talks are now public

Open Web Docs vs. MDN; esbuild v0.18.14; Bun v0.7.0; Node.js test runner; name mangling

Dr. Axel Rauschmayer and Johannes Weber — Tue, 25 Jul 2023 08:02:00 GMT

Maximizing impact of open documentation for the web platform

esbuild v0.18.14: local CSS names

Bun v0.7.0: experimental Vite support and more

You might not need Jest – the Node.js native test runner is great

Shrinking VS Code with name mangling

Babel 7.23.0; TC39 meeting September; custom rules in ESLint 9

Dr. Axel Rauschmayer and Johannes Weber — Tue, 03 Oct 2023 08:02:00 GMT

Babel 7.23.0: decorator metadata and many new import features

Updates from the TC39 meeting in September 2023

Preparing your custom rules for ESLint v9.0.0

Learn more about the JavaScript ecosystem (Sponsor)

Barrel files; regular expression denial of service; Intl segmenter API; launch of Bun; embedded JS

Dr. Axel Rauschmayer and Johannes Weber — Tue, 10 Oct 2023 08:02:00 GMT

Speeding up the JavaScript ecosystem: the barrel file debacle

This could be your ad (Sponsor)

A comprehensive guide to the dangers of regular expressions in JavaScript

Using the Intl segmenter API

JS Party podcast: Reflecting on Bun’s big launch with Jarred Sumner [54-minute audio]

Invitation to Ecma TC53 [ECMAScript modules for embedded systems] workshop

Task group for source maps; Parcel v2.10.0; ESLint flat config

Dr. Axel Rauschmayer and Johannes Weber — Tue, 17 Oct 2023 08:02:00 GMT

Ecma TC39 “ECMAScript” initiates a new task group to standardize source maps

Parcel v2.10.0

ESLint: flat config rollout plans

Oxc tool chain; Node.js 21; Biome v1.3.0; Biome toolchain; ESLint v8.52.0; Compiling JS to Wasm

Dr. Axel Rauschmayer and Johannes Weber — Tue, 24 Oct 2023 08:02:00 GMT

Oxc: suite of high-performance tools for JavaScript and TypeScript written in Rust

Node.js 21 is now available!

Biome v1.3.0

devtools.fm #70: Emanuele Stoppa – Biome [62-min. audio]

ESLint v8.52.0 released

Compile JavaScript to WebAssembly for web performance improvement

Yarn 4.0; Node v21.1.0; test assertion styles; dependency divergence; comparing the performance of bundlers; investing in Node.js

Dr. Axel Rauschmayer and Johannes Weber — Tue, 31 Oct 2023 09:02:00 GMT

CodiumAI | Generating meaningful tests for busy devs (Sponsor)

Release: Yarn 4.0

Node v21.1.0 (current): --experimental-detect-module

Test assertion styles in JavaScript

Introducing dependency divergence GitHub action

performance-compare: benchmark that compares Farm, Webpack, Vite, Rspack and Turbopack

Bloomberg invests in Node.js. Shouldn’t you?

Bun 1.0.9; Deno 1.38; service workers server WinterJS; deprecation of ESLint formatting rules; Test262 runner

Dr. Axel Rauschmayer and Johannes Weber — Tue, 07 Nov 2023 09:02:00 GMT

Bun v1.0.9

Deno 1.38: HTML doc generator and HMR

WinterJS: “most performant JavaScript Service Workers server thanks to Rust and SpiderMonkey”

Deprecation of formatting rules in ESLint

test262.fyi: daily Test262 (ECMAScript test suite) runner for many JavaScript engines

Pacquet package manager; WebGPU; test automation; NodeConf EU 2023 videos

Dr. Axel Rauschmayer and Johannes Weber — Tue, 14 Nov 2023 09:02:00 GMT

pacquet: experimental Node.js package manager written in Rust [rewrite of pnpm]

WebGPU: ecosystem that extends beyond JavaScript

Test automation: Learn best practices for writing effective and maintainable tests

NodeConf EU 2023 videos

Vite 5.0; Prettier 3.1; Node v21.2.0; Bun v1.0.12; explicit resource management; JS strings in V8

Dr. Axel Rauschmayer and Johannes Weber — Tue, 21 Nov 2023 09:02:00 GMT

Vite 5.0: Rollup 4, API cleanups and more

Prettier 3.1: New experimental ternaries formatting and Angular control flow syntax

Node v21.2.0 (current)

Bun v1.0.12

Explicit resource management: Exploring JavaScript’s and TypeScript’s new feature

Exploring V8’s strings: implementation and optimizations

“State of JavaScript 2023” survey; QuickJS-ng v0.1.0; esbuild 0.19.7; show package version downloads; typosquatting of npm package names

Dr. Axel Rauschmayer and Johannes Weber — Tue, 28 Nov 2023 09:02:00 GMT

The “State of JavaScript 2023” survey is open

Welcome to QuickJS-ng [friendly fork of JavaScript engine QuickJS]

esbuild 0.19.7

package-majors: How often were the major versions of a given npm package downloaded during the past week?

How Socket combats insidious typosquatting supply chain attacks

Prettier in Rust; Prettier performance improvements; Node v21.3.0; TC39 meeting November; esbuild bundle size analyzer; write shell scripts with zx; new web dev podcast

Dr. Axel Rauschmayer and Johannes Weber — Tue, 05 Dec 2023 09:02:00 GMT

Biome formatter wins the Prettier challenge (USD 22,500)

Prettier’s CLI: a performance deep dive

Node v21.3.0 (current): --disable-warning

Updates from the TC39 meeting in November 2023

esbuild’s bundle size analyzer web app now has a treemap visualization

Write shell scripts using JavaScript and zx

New podcast: “Off the main thread” with Jake Archibald and Surma about “whatever’s going on in the world of tech & web development”

JavaScript’s birthday; TC39 FAQ; ESLint v8.55.0; Bun v1.0.15; Socket CLI v0.9.0; Turborepo 1.11; Rspack v0.4.2; stop nesting ternaries; alternatives to JS in HTML & CSS; console methods; regex matching algorithm

Dr. Axel Rauschmayer and Johannes Weber — Tue, 12 Dec 2023 09:02:00 GMT

28 years ago (1995-12-04): “Netscape and Sun announce JavaScript, the open, cross-platform object scripting language for enterprise networks and the internet”

TC39 FAQ

New versions

ESLint v8.55.0 released

Bun v1.0.15

Socket CLI v0.9.0 now available

Turborepo 1.11

Rspack v0.4.2

Other news

Stop nesting ternaries in JavaScript

You don’t need JavaScript for that

Developer essentials: JavaScript console methods

Linear matching of JavaScript regular expressions

Npm 2023 retrospective; Prettier 3.2; Rspack 0.5; Bun v1.0.23; library for immutable updaes; Bun Shell

Dr. Axel Rauschmayer and Johannes Weber — Tue, 23 Jan 2024 09:02:00 GMT

npm in review: a 2023 retrospective on growth, security, and quirky facts

Prettier 3.2: Support JSONC and Angular’s ICU expression

Rspack 0.5: module federation and more

Bun v1.0.23: importing & embedding SQLite databases and more

Mutative: efficient immutable updates, faster than Immer

Bun Shell: Bun’s built-in library for cross-platform shell scripting

Deno 1.40; esbuild v0.20.0; ES proposal: explicit resource management; deprecated npm packages

Dr. Axel Rauschmayer and Johannes Weber — Tue, 30 Jan 2024 09:02:00 GMT

WorkOS, the modern API for auth and user identity. (Sponsor)

Deno 1.40: Temporal API

esbuild v0.20.0

Explicit resource management: exploring JavaScript’s new feature

How to protect your projects from the risks of deprecated npm packages

Deno in 2023; Turborepo 1.12; Promise.withResolvers; import attributes; Christopher “vjeux” Chedeau

Dr. Axel Rauschmayer and Johannes Weber — Tue, 06 Feb 2024 09:02:00 GMT

WorkOS, the modern API for auth and user identity. (Sponsor)

Deno in 2023

Turborepo 1.12

Deferred JavaScript promises using Promise.withResolvers

Detect and block JavaScript supply chain attacks (Sponsor)

Import attributes

DevtoolsFM podcast: Christopher “vjeux” Chedeau – Prettier, React Native

Unbundling npm; new JS runtime by Amazon; Vite 5.1; February TC39 meeting; ES stage 2.7; Web IDL for better web docs; V8: static roots; Node.js documentary trailer

Dr. Axel Rauschmayer and Johannes Weber — Tue, 13 Feb 2024 09:02:00 GMT

WorkOS, the modern API for auth and user identity. (Sponsor)

Node.js community debate intensifies over enabling Corepack by default and potentially unbundling npm

LLRT: Amazon’s new JavaScript runtime based on QuickJS

Vite 5.1 is out

Updates from the TC39 meeting in February 2024

New ECMAScript proposal stage: 2.7

Using Web IDL for better web docs

V8 JavaScript engine: static roots – objects with compile-time constant addresses

Official trailer: “Node.js: The Documentary”

New package repository JSR; proposed Set methods; Array.prototype.with(); Promise collection methods; date library Tempo; hot module replacement

Dr. Axel Rauschmayer and Johannes Weber — Tue, 20 Feb 2024 09:02:00 GMT

WorkOS, the modern API for auth and user identity. (Sponsor)

JSR first impressions (new package repository by Deno team)

Union, intersection, difference, and more are coming to JavaScript Sets

Immutable array updates via Array.prototype.with()

Looking at the JavaScript Promise Collection Methods

Detect and block JavaScript supply chain attacks (Sponsor)

“Tempo”: date and time library that works with JavaScript Date objects and supports time zones

Hot Module Replacement (HMR) is easy

JS toolchain for Wasm components; Node.js in 2023; ESLint in 2023; Deno package registry

Dr. Axel Rauschmayer and Johannes Weber — Tue, 27 Feb 2024 09:02:00 GMT

WorkOS, the modern API for auth and user identity. (Sponsor)

Jco 1.0: JavaScript toolchain for WebAssembly Components

Deno 1.41: smaller deno compile binaries

Node.js 2023 year in an article

ESLint’s 2023 year in review

JSR: What we know so far about Deno’s new JavaScript package registry

Babel 7.24.0; Parcel v2.12.0; Package Metadata Interoperability Collab Space; Eloquent JavaScript 4th edition; Deno survey & roadmap; JSR public beta

Dr. Axel Rauschmayer and Johannes Weber — Tue, 05 Mar 2024 09:02:00 GMT

WorkOS, the modern API for auth and user identity. (Sponsor)

Babel 7.24.0: Decorator updates and JSON module imports

Parcel v2.12.0: macros, new online REPL and more

Ship fast. Stay secure. (Sponsor)

New industry group at OpenJS Foundation: “Package Metadata Interoperability Collab Space”

Eloquent JavaScript – 4th edition (2024)

Deno: survey results and roadmap

JSR (JavaScript Registry) is in public beta

Rolldown; Node v21.7.0 (Current); Biome v1.6; open source package registries; JS in Safari 17.4; Intl.RelativeTimeFormat

Dr. Axel Rauschmayer and Johannes Weber — Tue, 12 Mar 2024 09:02:00 GMT

WorkOS, the modern API for auth and user identity. (Sponsor)

Rolldown: Rust-based web bundler by team of Vite

Node v21.7.0 (Current): text styling, loading & parsing environment variables, and more

Biome v1.6: partial support for Astro/Svelte/Vue files, and more

CISA announces initiative to fortify security of open source package registries

New JavaScript features in Safari 17.4: Promise.withResolvers(), Object.groupBy(), Map.groupBy()

Using Intl.RelativeTimeFormat for localized relative timings

Speedometer 3.0 benchmark; Rspack v0.5.7; Bun v1.0.31; finding unused files, dependencies and exports; garbage collection in V8

Dr. Axel Rauschmayer and Johannes Weber — Tue, 19 Mar 2024 09:02:00 GMT

WorkOS, the modern API for auth and user identity. (Sponsor)

Speedometer 3.0: shared browser benchmark for web application responsiveness

Rspack v0.5.7: experimental SWC Wasm plugins

Ship fast. Stay secure. (Sponsor)

Bun v1.0.31: bun --print, piping into bun, and more

Knip: find unused files, dependencies and exports in JavaScript and TypeScript projects

Garbage collection in V8

Node.js documentary; nodejs.org redesign; require(esm) in Node.js; new built-in Node.js features; vlt technology Inc.; Igalia & Open Web Docs; Turborepo 1.13; incremental JS updates; testing Markdown

Dr. Axel Rauschmayer and Johannes Weber — Tue, 26 Mar 2024 09:02:00 GMT

Node.js news

Node.js: The Documentary | An origin story [63-min. video]

The redesigned nodejs.org is live

require(esm) in Node.js

JAMstacked (Sponsor)

Three new built-in Node.js features

Node.js Technical Steering Committee confirms: no intention to remove npm from distribution

Other topics

vlt technology Inc. unveils team & investors and hints at mission: improving JavaScript packaging ecosystem

Igalia joins Open Web Docs Governing Committee

Turborepo 1.13: new terminal UI and more

Kuto: ship JavaScript updates incrementally

Markcheck: test Markdown code blocks with JavaScript and other languages

Iterator helpers; Deno 1.42; Interop 2023; runtime compatibility; GPU-accelerated sorting; Vite’s past, present, future

Dr. Axel Rauschmayer and Johannes Weber — Tue, 02 Apr 2024 08:02:00 GMT

WorkOS, the modern API for auth and user identity. (Sponsor)

Iterator helper methods

Deno 1.42: Better dependency management with JSR

Ship fast. Stay secure. (Sponsor)

Interop 2023: MDN updates

Runtime compatibility: How well are various web APIs supported by non-browser JavaScript runtimes?

accel-sort: sort ints and floats 70 times faster (requires NVIDIA GPU with CUDA Compute Capability)

PodRocket podcast: Vite’s past, present and future with Matias Capeletto

ESLint v9.0.0; ESLint Config Inspector; Bun 1.1; JavaScript Signals; learn JavaScript; numbers in JSON; objects in JS engines; V8 Sandbox

Dr. Axel Rauschmayer and Johannes Weber — Tue, 09 Apr 2024 08:02:00 GMT

ESLint v9.0.0: flat config and more

Introducing ESLint Config Inspector

Bun 1.1: support for Windows and more

ECMAScript proposal: JavaScript Signals (stage 0)

Introducing “Learn JavaScript”

What even is a JSON Number?

Object structure in JavaScript engines

The V8 Sandbox

April TC39 meeting; Rspack v0.6; future of JS packages; Evan You on Vue, Vite, etc.

Dr. Axel Rauschmayer and Johannes Weber — Tue, 16 Apr 2024 08:02:00 GMT

This Week In React - Keeps senior React devs up to date (Partner)

Updates from the TC39 meeting in April 2024

Announcing Rspack v0.6

How we built JSR

Ship fast. Stay secure. (Sponsor)

The future of JavaScript package handling and open source with Darcy Clarke [35-min. podcast]

Evan You talking Vue.js, Vite and More [78-min. podcast]

Improved tree-shaking in Rollup; Node v22.1.0; Deno 1.43; npm feedback; npm script runner; refactoring complex boolean expressions; URL.parse(); JavaScript language design

Dr. Axel Rauschmayer and Johannes Weber — Tue, 23 Apr 2024 08:02:00 GMT

Rollup: improved tree-shaking due to tracking of const parameter values

Node v22.1.0: automatic on-disk code caching

Live Workshop: Sentry 🤝: Supabase: Find the slow queries in your database (Sponsor)

Deno 1.43: improved Language Server performance

Vitest 1.6.0: faster “forks” pool, comparing benchmark results, and more

npm feedback migrates from discussions in a GitHub repository to GitHub Community

nrr: minimal, fast npm script runner

Code health tip: refactor code with complex boolean expressions to make it easier to understand

URL.parse(): new URL() without exceptions

JavaScript language design and implementation in tandem

Node.js 22; Bun 1.1.5; JSR is not a package manager

Dr. Axel Rauschmayer and Johannes Weber — Tue, 30 Apr 2024 08:02:00 GMT

Node.js 22: require() ESM modules, --run package scripts, --watch files, fs.glob() and more

Bun 1.1.5: cross-compile executables, new crash reporter, import files as text, and more

Ship fast. Stay secure. (Sponsor)

JSR is not another package manager

JavaScript engine optimization technique: inline caches

Improved tree-shaking in Rollup; Node v22.1.0; Deno 1.43; npm feedback; npm script runner; refactoring complex boolean expressions; URL.parse(); JavaScript language design

Dr. Axel Rauschmayer and Johannes Weber — Tue, 07 May 2024 08:02:00 GMT

Rollup: improved tree-shaking due to tracking of const parameter values

Node v22.1.0: automatic on-disk code caching

Live Workshop: Sentry 🤝 Supabase: Find the slow queries in your database (Sponsor)

Deno 1.43: improved Language Server performance

Vitest 1.6.0: faster “forks” pool, comparing benchmark results, and more

npm feedback migrates from discussions in a GitHub repository to GitHub Community

nrr: minimal, fast npm script runner

Code health tip: refactor code with complex boolean expressions to make it easier to understand

URL.parse(): new URL() without exceptions

JavaScript language design and implementation in tandem

Gulp Developer Survey; esbuild v0.21.0; ESLint compatibility utilities; Nx 19.0; Bun v1.1.8; shell scripts; patching globals; find unused files, dependencies, exports; RegExp resources; garbage collection; recent additions to Node.js

Dr. Axel Rauschmayer and Johannes Weber — Tue, 14 May 2024 08:02:00 GMT

Introducing the Gulp Developer Survey

esbuild v0.21.0: support for ECMAScript decorators and more

ESLint compatibility utilities let you use older plugins with ESLint v9

Nx 19.0 release

Bun v1.1.8

Execa 9: write shell scripts in a JavaScript style

Ship fast. Stay secure. (Sponsor)

Why patching globals is harmful

knip: find unused files, dependencies and exports in your JavaScript and TypeScript projects

Awesome Regex: opinionated list of regular expression tools, tutorials, libraries, and other resources

What the Chrome and Firefox profilers teach us about JavaScript garbage collection

Node.js and its many, many new features with Matteo Collina [89-min. video]

Esbuild v0.21.3; ESLint v9.3.0; Node v22.2.0; Promise.withResolvers(); duplicate named capturing groups; web at Google I/O 2024

Dr. Axel Rauschmayer and Johannes Weber — Tue, 21 May 2024 08:02:00 GMT

Tired of handling a tech stack with REST, SQL, Webpack and 1000 other technologies? (Sponsor)

esbuild v0.21.3: decorator metadata and more

ESLint v9.3.0: new options for some rules and more

Node v22.2.0 (current)

ECMAScript 2024 feature: Promise.withResolvers()

ECMAScript 2025 feature: duplicate named capturing groups for regular expressions

Web at Google I/O 2024 [YouTube playlist]

Interesting npm packages

open: open stuff like URLs, files, executables – across platforms

xlsxtable: create Excel .xlsx files

littlezipper: use the CompressionStream API to create .zip files

Symbols as WeakMap keys

Dr. Axel Rauschmayer and Johannes Weber — Tue, 28 May 2024 08:02:00 GMT

ECMAScript 2023 feature: symbols as WeakMap keys

Compression Streams are now supported by all major browsers

Free, open-source CLI to manage StackedPRs (Sponsor)

ESLint Configuration Migrator; Rspack v0.7; Deno 1.44; oxlint v0.4.2; Intl.DateTimeFormat; more powerful fetch()

Dr. Axel Rauschmayer and Johannes Weber — Tue, 04 Jun 2024 08:02:00 GMT

Tired of handling a tech stack with REST, SQL, Webpack and 1000 other technologies? (Sponsor)

Introducing the ESLint Configuration Migrator

Rspack v0.7: lazy compilation, faster CSS builds and more

Deno 1.44: private npm registries, improved Node.js compat and performance boosts

oxlint v0.4.2

Ship fast. Stay secure. (Sponsor)

Date formatting using Intl.DateTimeFormat

fetch-in-chunks: fetching large files in chunks, with parallel downloads, progress tracking and request abortion

Prettier 3.3; Turborepo 2.0; Rspack v0.7.1; most popular language; ArrayBuffers; Promises; Corepack; template tags for RegExps; Node.js IPC

Dr. Axel Rauschmayer and Johannes Weber — Tue, 11 Jun 2024 08:02:00 GMT

Prettier 3.3: better formatting for import attributes, property keys, template interpolations, etc.

Turborepo 2.0: new terminal UI, watch mode, new documentation and more

Rspack v0.7.1: up to 15% faster JavaScript parsing

Ship fast. Stay secure. (Sponsor)

Rust growing fastest, but JavaScript reigns supreme

ECMAScript 2024 features: resizing and transferring ArrayBuffers

JavaScript Promises from the ground up

How to use Corepack

Interesting npm packages

regex: template tags that help with creating RegExps and provide advanced features

Node.js IPC made easy with Execa 9.2

Better ESM experience; Node.js is here to stay; June TC39 meeting; Node.js test runner; MDN as man pages; Node.js v22.3.0; ESLint v9.5.0; Rspack v0.7.3; Deno standard library

Dr. Axel Rauschmayer and Johannes Weber — Tue, 18 Jun 2024 08:02:00 GMT

How JavaScript is finally improving the module experience

Node.js is here to stay

Updates from the TC39 meeting in June 2024

Using Node.js’s test runner

MDN Manpages: MDN JavaScript reference documentation converted to man pages

New versions

Node.js v22.3.0: snapshot testing and more

ESLint v9.5.0: including .gitignore in eslint.config.js and more

Rspack v0.7.3: Preact refresh, CSS tree shaking, concatenated modules stats, and more

Deno is starting to stabilize its standard library to 1.0 versions

ES2024 book; State of JS results; improving ESM; web build tool “Farm”; optimizing JS; property-based testing; Web Engines Hackfest videos; Biome v1.8.0; Rspack v0.7.4; Bun v1.1.14

Dr. Axel Rauschmayer and Johannes Weber — Tue, 25 Jun 2024 08:02:00 GMT

Out now: “Exploring JavaScript (ES2024 Edition)”

State of JavaScript 2023: the results are in

5 ways JavaScript is improving modules for developers

Farm: web build tool written in Rust

Tips for optimizing JavaScript

Hands-on guide to property-based testing in JavaScript

What is your preferred JavaScript bundler?

Ship fast. Stay secure. (Sponsor)

Now online: video recordings from Web Engines Hackfest 2024

New versions

Biome v1.8.0: support for CSS and more

Rspack v0.7.4: CSS minimizer and more

Bun v1.1.14: patching dependencies, ORM-less object mapping, and more

ECMAScript 2024; new Set methods; JS performance initiative; rounding errors; benchmarking tool; JSNation 2024 videos; Rolldown v0.10.5; oxlint v0.5.0

Dr. Axel Rauschmayer and Johannes Weber — Tue, 02 Jul 2024 08:02:00 GMT

This Week In React - Keeps senior React devs up to date (Partner)

Ecma International approves ECMAScript 2024: What’s new?

The JavaScript Set methods are now part of Baseline

e18e (Ecosystem Performance): creating a community dedicated to JavaScript performance

Handling JavaScript rounding errors in financial applications

ESBench: modern JavaScript benchmarking tool

Videos of JSNation 2024 talks are online

New versions

Rolldown v0.10.5: bundling TypeScript and more

Oxlint v0.5.0: new linting rules for JavaScript and TypeScript

Next for ESLint; aborting Promises; Math.random() vs. Crypto.getRandomValues(); library stdlib.io; library es-toolkit; babel-plugin-transform-regex; emoji-regex-xs; bundler Mako; Node v22.4.0 (current); Bun v1.1.18; esbuild v0.22.0

Dr. Axel Rauschmayer and Johannes Weber — Tue, 09 Jul 2024 08:02:00 GMT

What’s coming next for ESLint

Creating abortable tasks in JavaScript with Promise.withResolvers() and AbortController

Randomness In JavaScript: Math.random() vs. Crypto.getRandomValues()

A standard library for JavaScript with Philipp Burckhardt from stdlib.io [51-min. audio]

Ship fast. Stay secure. (Sponsor)

New libraries and tools

es-toolkit: alternative to Lodash with a focus on speed and TypeScript

babel-plugin-transform-regex: compile tagged templates with future RegExp features to RegExp literals

emoji-regex-xs: compact regular expression for matching emojis

Mako: web bundler written in Rust with a focus on speed

Versions

Node v22.4.0 (current): experimental web storage API and more

Bun v1.1.18: .npmrc support, enum inlining and more

esbuild v0.22.0: es2024 target, WASI binaries and more

Leaner npm metadata; Boa JS engine; pnpm 9.5; Vitest 2.0; ESLint v9.7.0; Deno 1.45

Dr. Axel Rauschmayer and Johannes Weber — Tue, 16 Jul 2024 08:02:00 GMT

Leaner npm “packument” (package version metadata)

Boa: embeddable experimental JavaScript engine written in Rust

New versions

pnpm 9.5: catalogs (names for dependency version ranges) and more

Vitest 2.0: better browser mode and more

ESLint v9.7.0: duplicate RegExp group names, regexes in no-restricted-imports, and more

Deno 1.45: workspace and monorepo support

Node.js v22.5.0; “state of JS” discussion; ES2024 book; dotJS 2024 videos

Dr. Axel Rauschmayer and Johannes Weber — Tue, 23 Jul 2024 08:02:00 GMT

Node.js v22.5.0 (current): node:sqlite and more

The state of JavaScript with Sacha Greif [39-min. audio]

Out now: “Exploring JavaScript (ES2024 Edition)” (Partner)

The dotJS 2024 videos are now online

ECMAScript 2024; June TC39 meeting; Babel 7.25.0; subresource integrity; performance optimizations; ES Tooling organization; ESLint; code reviews

Dr. Axel Rauschmayer and Johannes Weber — Tue, 30 Jul 2024 08:02:00 GMT

ECMAScript

What’s new for JavaScript developers in ECMAScript 2024

Summary of the June 2024 TC39 plenary in Helsinki

Babel 7.25.0: Safari bugfixes and duplicated named capturing groups

Coding techniques

Subresource integrity for scripts, CSS, etc. (via cryptographic hashes)

JavaScript performance optimizations: code splitting, lazy loading, web workers, minifying files, asynchronous loading and more

ES Tooling: GitHub organization for performance-related tooling

Ship fast. Stay secure. (Sponsor)

Podcasts

Josh Goldberg – going flat with ESLint [81-min. audio]

Working Code Podcast: code review nuance [63-min. audio]

AbortController; date-fns v4.0; bundling

Dr. Axel Rauschmayer and Johannes Weber — Tue, 01 Oct 2024 08:02:00 GMT

Don’t Sleep on AbortController

date-fns v4.0: first-class time zone support and no major breaking changes

Oxc Transform Alpha: transpiling TypeScript to JavaScript and .d.ts

Ship fast. Stay secure. (Sponsor)

Bundling past, present, and future [38-min. video]

Evan You’s VoidZero Inc.; ESLint checks JSON & Markdown; ESLint v9.12.0; e18e contributions; catch prediction; outdated docs; ViteConf 2024 talks

Dr. Axel Rauschmayer and Johannes Weber — Tue, 08 Oct 2024 08:02:00 GMT

VoidZero Inc.: founded by Evan You (Vue, Vite) to build a unified open source toolchain for JavaScript

Stay Up-to-Date with the Latest Browser Technologies (Sponsor)

ESLint now officially supports linting of JSON and Markdown

ESLint v9.12.0: experimental new configuration file resolution algorithm

e18e (ecosystem performance): september contributions

Catch prediction in Chrome DevTools: Why it’s hard and how to make it better

Outdated docs are tech debt

ViteConf 2024 talks on YouTube

Deno 2; Open Source Pledge; TC39 meeting October; language evolution; ES2025; destructuring

Dr. Axel Rauschmayer and Johannes Weber — Tue, 15 Oct 2024 08:02:00 GMT

This Week In React - Keeps senior React devs up to date (Partner)

Announcing Deno 2

Open Source Pledge: pay your share

TC39 advances 10+ ECMAScript proposals

JavaScript language evolution: Problems and what can we do about it?

Ship fast. Stay secure. (Sponsor)

JavaScript due for new time, date and Set features next year

A guide to destructuring in JavaScript

JS0/JSSugar; converting CommonJS to ESM; top-level await in Node.js; Node.js v23.0.0; Bun v1.1.31; ESLint v9.13.0; Turborepo 2.2

Dr. Axel Rauschmayer and Johannes Weber — Tue, 22 Oct 2024 08:02:00 GMT

Discussing JS0/JSSugar

How to convert CommonJS to ESM

In the future using top-level await might be cause a backwards compatibility break in Node

New versions

Node.js v23.0.0 (current)

Bun v1.1.31

ESLint v9.13.0 released

Turborepo 2.2

Free WebStorm; JSR working group; JS vs. “faster” languages; Babel 7.26.0; Node.js v23.1.0

Dr. Axel Rauschmayer and Johannes Weber — Tue, 29 Oct 2024 09:02:00 GMT

JetBrains: “WebStorm and Rider are now free for non-commercial use”

First meeting of JSR (JS registry) working group

Why I’m skeptical of rewriting JavaScript tools in “faster” languages

Ship fast. Stay secure. (Sponsor)

New versions

Babel 7.26.0: stage 4 features enabled by default, new experimental code printer

Node.js v23.1.0 (current)

Vlt client & registry; ESMeta

Dr. Axel Rauschmayer and Johannes Weber — Tue, 05 Nov 2024 09:02:00 GMT

Two vlt products: a better npm client and a serverless package registry

ESMeta: tools that treat the ECMAScript specification like a programming language

E18e showcase; composite Map keys; ??= operator; Node.js pull requests; Rspack 1.1; JSR Working Group; vlt Package Manager & Serverless Registry; Deno package management; npmpackage.info

Dr. Axel Rauschmayer and Johannes Weber — Tue, 12 Nov 2024 09:02:00 GMT

e18e (ecosystem performance): October contributions showcase

Composite Map keys in JavaScript with bitsets

JavaScript’s ??= operator: default values made simple

Node.js implements stricter policies for semver-major pull requests ahead of release deadlines

Rspack 1.1: performance improvements and more

Package management

JSR Working Group kicks off with ambitious roadmap and plans for open governance

Introducing the vlt Package Manager & Serverless Registry

Deno’s new built-in package management for npm and JSR

npmpackage.info: detailed information about npm packages

Ship fast. Stay secure. (Sponsor)

Dependencies vs. devDependencies; timezones; refactoring barrel files; deno compile; Parcel v2.13.0; Rspack v1.1.1; Turborepo 2.3; ESLint v9.15.0

Dr. Axel Rauschmayer and Johannes Weber — Tue, 19 Nov 2024 09:02:00 GMT

Dependencies vs. devDependencies for JavaScript apps

Managing timezones in JavaScript apps

Refactoring barrel files with codemods

Self-contained executable programs with deno compile

New versions

Parcel v2.13.0: mode for bundling libraries, globs in package.json "source", and more

Rspack v1.1.1: bundle webpack-compatible “dynamic-link libraries”

Turborepo 2.3: boundaries RFC, package task shortcuts, simplified cache control, and more

ESLint v9.15.0: plugins can specify meta.defaultOptions, and more

State of JavaScript 2024; ECMAScript Internationalization API; JS without build system; podcast with Evan You; Rspack v1.1.2; oxlint v0.13.0; Deno 2.1; Bun v1.1.35

Dr. Axel Rauschmayer and Johannes Weber — Tue, 26 Nov 2024 09:02:00 GMT

Survey: State of JavaScript 2024 (Nov 13 – Dec 3)

Intl [ECMAScript Internationalization API] is your superhero

Importing a frontend JavaScript library without a build system

Podcast with Evan You: Vue, Vite, VoidZero and the Future of JavaScript Tooling

New versions

Rspack v1.1.2: support for import attributes for external modules and more

oxlint v0.13.0: new rules and more

Deno 2.1: Wasm Imports and other enhancements

Bun v1.1.35: smaller binaries, console.group() and more

Canceling JS trademark; mapping over Promises; scheduler API; Oniguruma regexes; multi-file support in Biome; Vite 6.0; Prettier 3.4; ESLint v9.16.0; Bun v1.1.37

Dr. Axel Rauschmayer and Johannes Weber — Wed, 04 Dec 2024 09:03:00 GMT

Deno v. Oracle: Canceling the JavaScript Trademark

Mapping over Promises in JavaScript

Using the experimental scheduler browser API

Oniguruma-To-ES: Convert advanced Ruby/Oniguruma regexes to native JS RegExp

Biome’s approach to multi-file analysis

Ship fast. Stay secure. (Sponsor)

New versions

Vite 6.0: experimental Environment API and more

Prettier 3.4: a lot of bug fixes

ESLint v9.16.0: ignoreComputedKeys option for sort-keys rule and more

Bun v1.1.37: realtime debuggerless error reporting in VSCode and more

Require(esm) in Node.js LTS; simplified npm search; JS videos; Rolldown v0.15.0; oxlint v0.14.0

Dr. Axel Rauschmayer and Johannes Weber — Tue, 10 Dec 2024 09:02:00 GMT

Node.js v22.12.0 (LTS): require(esm) is enabled by default

Announcing npm’s new simplified search experience

Videos from the London TypeScript Community Meetup on Oct 2 [includes JS-only topics]

New versions

Rolldown v0.15.0: tree-shaking for dynamic import() and more

oxlint v0.14.0: new rules and more

State of JS 2024; compiling JS via Porffor; source map format specification; December TC39 meeting; e18e contributions in November; Node.js performance ; Node v23.4.0

Dr. Axel Rauschmayer and Johannes Weber — Tue, 17 Dec 2024 09:02:00 GMT

State of JavaScript 2024: the results are in

Porffor: compile JavaScript to Wasm or native

Ecma International approves first edition of source map format specification

Updates from the TC39 meeting in December 2024

e18e contributions in November (performance gains across the JS ecosystem)

Node.js

State of Node.js performance 2024

Node v23.4.0 (current): node:sqlite without a flag and more

Pnpm 10; Rolldown v1.0.0-beta.1; Vitest 3.0; WinterCG becomes WinterTC; RegExp pattern modifiers; formatting dates & times; esbuild bundle analyzer

Dr. Axel Rauschmayer and Johannes Weber — Tue, 21 Jan 2025 09:02:00 GMT

Secure your JavaScript dependencies. (Sponsor)

New versions

pnpm 10: lifecycle scripts of installed dependencies are not executed (by default)

The first beta of Rolldown (Rust-based bundler to eventually power Vite) is out

Vitest 3.0 is out

Other news

WinterCG (who work on server-side JS APIs) become WinterTC at Ecma

ECMAScript feature: regular expression pattern modifiers

Formatting dates and times in JavaScript with Temporal and the Internationalization API

Hawkeye: esbuild bundle analyzer

Yeoman’s maintenance reboot; ESLint’s 2024; RegExp escaping; Bun 1.2; Rspack 1.2; ESLint v9.19.0

Dr. Axel Rauschmayer and Johannes Weber — Tue, 28 Jan 2025 09:02:00 GMT

Yeoman’s next chapter: maintenance reboot

ESLint’s 2024 year in review

ECMAScript proposal: RegExp escaping

New versions

Bun 1.2: increased Node.js compatibility, built-in APIs for S3 object storage & PostgreSQL, and more

Rspack 1.2: faster hot starts via caching, Yarn PnP, and more

ESLint v9.19.0: Reporting unused /*eslint*/ config comments and more

Mocking fetch(); failed npm proposal; fetch() and HTTP/2 in Node.js, Bun, Deno; Node.js security audit; performance.now() 2024; performance.sync() 2024; ES Module Shims 2.0; Web Workers on Node.js; Turborepo 2.4; pnpm 10.1

Dr. Axel Rauschmayer and Johannes Weber — Tue, 04 Feb 2025 09:02:00 GMT

The easiest security tool you will ever install. (Sponsor)

Mentoss: mocking fetch() in browsers and server-side runtimes

Story of a failed proposal: compressing all npm packages with Zopfli

The state of fetch() and HTTP/2 support in Node.js, Bun and Deno

Enhancing Node.js security: highlights from the recent audit

Videos: performance.now() 2024 conference on web performance

Videos: performance.sync() 2024 meetup on web performance and collaboration

New versions

ES Module Shims 2.0: “nobuild” TypeScript in browsers and more

web-worker 1.5.0: Web Worker API for Node.js

Turborepo 2.4: Boundaries, terminal UI improvements, watch mode caching, and more

pnpm 10.1: new features for dealing with ignored build scripts and more

JSR open governance board; ESM-only packages; breaking up long tasks; Prettier 3.5; esbuild v0.25.0; parsing library Ohm; fuzzy string matching

Dr. Axel Rauschmayer and Johannes Weber — Tue, 11 Feb 2025 09:02:00 GMT

Introducing the JSR open governance board

Moving on to ESM-only npm packages

There are a lot of ways to break up long tasks in JavaScript

New versions

Prettier 3.5: New objectWrap option, experimentalOperatorPosition option and TS config file support

esbuild v0.25.0: improved support for CSS nesting, bug fixes, and more

Libraries

Ohm: library for building parsers, interpreters, compilers, and more

QuantumMatcher: efficient fuzzy matching for strings

Bundling dependencies; keyword `using`; Intl.DurationFormat; vlt client; Deno npm module specifiers; Node v23.8.0; require(esm); Node.js loader framework; bundler plugins

Dr. Axel Rauschmayer and Johannes Weber — Wed, 19 Feb 2025 09:03:00 GMT

Secure your JavaScript dependencies. (Sponsor)

Bundling dependencies (and when not to do it)

Clean room tests with JavaScript’s using keyword

Using Intl.DurationFormat for localized durations

vlt client for managing packages: new GUI features

Now recommended for Deno: npm: module specifiers

Node.js

Node v23.8.0 (current): URL Pattern API, zstd compression, named threads and more

require(esm) backported to Node.js 20, paving the way for ESM-only packages

Interesting npm packages

unloader: Node.js loader framework with a Rollup-like interface

Unplugin: unified plugin system for Vite, Rollup, Webpack, esbuild, Rolldown, and more

Alternatives to npm; TC39 meeting; Rust and JS plugins; long-term software maintenance; WeakMaps; JS just-in-time compilation; test262; ESLint lints CSS; Bun v1.2.3; Deno 2.2

Dr. Axel Rauschmayer and Johannes Weber — Wed, 26 Feb 2025 09:03:00 GMT

Is npm enough? Why startups are coming after this JavaScript package registry

ECMAScript proposal updates at the 2025-02 TC39 meeting

Speeding up the JavaScript ecosystem – Rust and JavaScript plugins

The reality of long-term software maintenance

Use cases for WeakMaps in JavaScript

How does JavaScript just-in-time compilation work?

Contributing SpiderMonkey tests to the ECMAScript test suite test262

New versions

ESLint now officially supports linting of CSS

Bun v1.2.3: dev server with bundling and hot reloading, routing for Bun.serve(), new SQL features and more

Deno 2.2: OpenTelemetry, lint plugins, node:sqlite and more

Interesting npm packages

showify: library for displaying potentially complex JavaScript values

tinyglobby: globbing library (minimal alternative to globby and fast-glob)

Trust in JS supply chain; sync vs. async code; JIT vulnerabilities; parseInt() and keycap emojis; V8 performance improvement; Node Modules Inspector; object hashing; key-value storage API

Dr. Axel Rauschmayer and Johannes Weber — Wed, 05 Mar 2025 09:03:00 GMT

Secure your JavaScript dependencies. (Sponsor)

Reproducibility vs. provenance: trusting the JavaScript supply chain

Async, sync, in between: writing code that can be used synchronously and asynchronously

A mere mortal’s introduction to JIT vulnerabilities in JavaScript engines

To parse an int: parseInt() and keycap emojis

Turbocharging V8 with mutable heap numbers

Packages and tools

Node Modules Inspector: Visualize node_modules, inspect dependencies, and more

ohash: simple object hashing, serialization and comparison

Unstorage: async key-value storage API for browser, workers, Node.js

Biome vs. Prettier & ESLint; ESLint flat config improvements; returning from async functions; pros and cons of monorepos; Dependabot improvements; npm 11.2.0

Dr. Axel Rauschmayer and Johannes Weber — Wed, 12 Mar 2025 09:03:00 GMT

Is Biome ready to replace Prettier & ESLint?

ESLint: Evolving flat config with extends

JavaScript best practice: use return await

I love monorepos – except when they are annoying

Easily distinguish between direct and transitive dependencies of npm packages (in Dependabot alerts etc.)

npm 11.2.0: npm init --init-type, managing the npx cache, and more

Web Almanac: JS; syntactic quirks; Parcel v2.14.0; Bun v1.2.5; Node.js on Discord; Node v20.19.0; Node v23.10.0

Dr. Axel Rauschmayer and Johannes Weber — Wed, 19 Mar 2025 09:03:00 GMT

The easiest security tool you will ever install. (Sponsor)

Web Almanac 2024: JavaScript

JavaScript syntactic quirks (2020)

Parcel v2.14.0: React Server Components, MDX and more

Bun v1.2.5: support for Svelte and CSS modules

Node.js

Node.js launches official community space on Discord

Node v20.19.0 (LTS): require(esm), module syntax detection, and more

Node v23.10.0 (Current): --experimental-config-file and more

Rsdoctor build analyzer; Corepack removed from Node.js; migrating to ESM; Intl.DurationFormat; ESLint supports TS syntax; migrating to ESLint v9

Dr. Axel Rauschmayer and Johannes Weber — Wed, 26 Mar 2025 09:03:00 GMT

Rsdoctor 1.0: build analyzer for Rspack that’s compatible with webpack

Reach JavaScript developers through an ad on ECMAScript News

Node.js TSC votes to stop distributing Corepack

Migrating the ecosystem to ES modules

Intl.DurationFormat: Format time durations with locale support

ESLint

ESLint v.9.23.0: TypeScript syntax support in 3 core rules

Migrating to ESLint v9: a guide

Temporal-polyfill v0.3.0; TC39 February meeting; V8 Turbofan; Rspack 1.3; Vitest 3.1.0; pnpm 10.7; Babel 7.27.0

Dr. Axel Rauschmayer and Johannes Weber — Wed, 02 Apr 2025 08:03:00 GMT

Secure your JavaScript dependencies. (Sponsor)

temporal-polyfill v0.3.0: support for the latest version of the API (2024-07)

Summary of the February 2025 TC39 plenary

V8’s Turbofan: from Sea of Nodes to control-flow graphs

New versions

Rspack 1.3: circular dependency detection, bundling HTTP imports and more

Vitest 3.1.0: hide output from passing tests and more

pnpm 10.7: use env variables in pnpm-workspace.yaml, patch dependencies by version ranges, and more

Babel 7.27.0: better ecosystem alignment

E18e showcase; JS to Wasm compiler; useful JS features; ESLint bulk suppressions; minimal V8-based runtime; smaller HTTP responses; debugging memory leaks in Bun

Dr. Axel Rauschmayer and Johannes Weber — Wed, 09 Apr 2025 08:03:00 GMT

Free online: “Exploring JavaScript (ES2024 Edition)” (Partner)

e18e (Ecosystem Performance): community showcase Q1 2025

JAWSM: JavaScript to WebAssembly compiler

JavaScript features worth knowing in 2025

ESLint bulk suppressions: enabling stricter linting incrementally

bare: minimal V8-based JavaScript runtime for desktop and mobile

Compression Dictionary Transport: using shared compression dictionaries to reduce the transport size of HTTP responses

Bun: debugging JavaScript memory leaks via V8 heap snapshots and Chrome DevTools

E18e showcase; JS to Wasm compiler; useful JS features; ESLint bulk suppressions; minimal V8-based runtime; smaller HTTP responses; debugging memory leaks in Bun

Dr. Axel Rauschmayer and Johannes Weber — Sun, 13 Apr 2025 08:07:00 GMT

Repository template framework; Rspack/Vercel partnership; Temporal in Firefox; nullish coalescing operator; Bun v1.2.9

Dr. Axel Rauschmayer and Johannes Weber — Wed, 16 Apr 2025 08:03:00 GMT

Detect suspicious package updates in real-time. (Sponsor)

Bingo: repository template framework

Rspack partners with Vercel on shared foundations

Shipping Temporal in Firefox

Mastering default values in JavaScript with the nullish coalescing operator (??)

Bun v1.2.9: Built-in Redis client and more

April TC39 meeting; pnpm 10.9; V8 memory management; package security; bundler explorer; how Rolldown works; intro to Rspack; e18e (Ecosystem Performance); Zack Jackson; Nicolò Ribaudo

Dr. Axel Rauschmayer and Johannes Weber — Wed, 23 Apr 2025 08:03:00 GMT

Godspeed is a 100% keyboard-driven to-do manager (Sponsor)

ECMAScript proposal updates at the 2025-04 TC39 meeting

pnpm 10.9: installing JSR packages and more

Optimizing Node.js performance: V8 memory management and garbage collection tuning

vlt client: querying security information about packages (provided by Socket)

Bundlers

Bundler Explorer: playground for Rollup, Rolldown and esbuild

How Rolldown works: module loading, dependency graphs, and optimization explained

Introduction to the JavaScript bundler Rspack

Podcast episodes

DejaVue Podcast: “e18e (Ecosystem Performance)” with James Garbutt

devtools.fm podcast: Zack Jackson – ByteDance, rspack, and the future of web development

Igalia podcast: Nicolò Ribaudo about the past, present and future of Babel

History of modules; categorizing package dependencies; universal server API

Dr. Axel Rauschmayer and Johannes Weber — Wed, 30 Apr 2025 08:03:00 GMT

The easiest security tool you will ever install. (Sponsor)

The evolution of JavaScript modularity (from 2018)

Using pnpm catalogs for categorizing package dependencies

srvx: universal server API that supports Node.js, Deno and Bun

New book (free online): “Exploring TypeScript” (Partner)

Explicit compile hints; JSR Board Meeting; converting values to strings; rest and spread; publishing an npm package; podcast episode on web tooling; ESLint v9.26.0; Deno 2.3

Dr. Axel Rauschmayer and Johannes Weber — Wed, 07 May 2025 08:03:00 GMT

Tonkotsu Is a Natural Language IDE for JS & TS Developers (Sponsor)

Giving V8 a heads-up: faster JavaScript startup with explicit compile hints

JSR Board Meeting 2025-04-17: concrete steps toward sustainable open governance and more

Converting values to strings in JavaScript has pitfalls

The power of the spread and rest syntax in JavaScript

Tutorial: publishing an npm package

ConTejas Code Podcast: Alexander Lichter (VoidZero) – the state of modern web tooling

New versions

ESLint v9.26.0: MCP server integration, globalThis in no-shadow-restricted-names and more

Deno 2.3: improved deno compile, local npm packages, and more

Composites proposal; Error.isError(); generators; migrating to Biome; V8 overview; Node.js 24; Parcel v2.15.0

Dr. Axel Rauschmayer and Johannes Weber — Wed, 14 May 2025 08:03:00 GMT

Secure your JavaScript dependencies. (Sponsor)

Matt Pocock and Ashley Claymore on the composites proposal (composite keys in Maps and Sets)

Error.isError(): better way to check error types in JavaScript

I think the ergonomics of JavaScript generators is growing on me

Migrating a JavaScript project from Prettier and ESLint to Biome

How V8 JavaScript engine works behind the scenes

New versions

An introduction to Node.js 24 from Red Hat

Parcel v2.15.0: new transformer & minifier for HTML & SVG, fewer npm dependencies, and more

`using`; ES Module Shims 2.5; html-eslint; new Mocha website; Nx 21

Dr. Axel Rauschmayer and Johannes Weber — Wed, 21 May 2025 08:03:00 GMT

Tonkotsu Is a Natural Language IDE for JS & TS Developers (Sponsor)

JavaScript’s new superpower: explicit resource management via using

ES Module Shims 2.5: hot reloading and more

ESLint can now lint HTML using the html-eslint language plugin

A preview of the new Mocha website is now online

Nx 21: Continuous tasks and Terminal UI lead the way

JSPM 4.0; history of JS; ESLint v9.0.0 retrospective; Bun v1.2.14; debugging JS in Wasm; array.at(); Temporal API; 2025-04 TC39 meeting

Dr. Axel Rauschmayer and Johannes Weber — Wed, 28 May 2025 08:03:00 GMT

Detect suspicious package updates in real-time. (Sponsor)

JSPM 4.0: dependency management via import maps in browsers (benefits: reduced tooling and more)

A brief history of JavaScript

ESLint v9.0.0: A retrospective - ESLint - Pluggable JavaScript Linter

Bun v1.2.14: catalogs in bun install and more

The state of JavaScript debugging in WebAssembly

JavaScript features

How JavaScript’s at() method makes array indexing easier

JavaScript’s upcoming Temporal API and what problems it will solve

Summary of the April 2025 TC39 plenary

Rolldown-vite; JS error handling; Nova JS engine; iterator helpers; parsing dates; JS generators; vlt client; Bun v1.2.15

Dr. Axel Rauschmayer and Johannes Weber — Wed, 04 Jun 2025 08:03:00 GMT

rolldown-vite: preview of the next version of Vite

Exploring JavaScript error handling

Nova: JavaScript and WebAssembly engine written in Rust

JavaScript features

Iterator helpers have become Baseline Newly Available

Why are 2025/05/28 and 2025-05-28 different days in JavaScript?

Early exits in JavaScript generators

New versions

vlt client: jsr: support

Introducing the new vlt exec and vlt exec-cache commands

Bun v1.2.15: bun audit, BUN_OPTIONS, editing files in Chrome, and more

Configuring Node.js; analyzing JS & CSS bundles; May TC39 meeting; JS directives; optional chaining; date day periods; pnpm v10.12; Vitest 3.2

Dr. Axel Rauschmayer and Johannes Weber — Wed, 11 Jun 2025 08:03:00 GMT

The easiest security tool you will ever install. (Sponsor)

Stop losing sleep over Node.js config: Here’s how to get it right

Sonda: universal visualizer and analyzer for JavaScript and CSS bundles

JavaScript features

ECMAScript proposal updates at the 2025-05 TC39 meeting

Pragmas, magic comments and directive prologues in JavaScript and TypeScript

Write more reliable JavaScript with optional chaining

Intl.DateTimeFormat: format dates as day periods such as "in the morning", "noon", etc.

New versions

pnpm v10.12: global virtual stores for faster installation, new catalog features, and more

Vitest 3.2: improvements to Browser Mode and TypeScript support

Exploring JS ES2025; fixing import map limitations; Node v24.2.0; Jest 30; Rstest testing framework; Oxlint 1.0; ESLint for DSLs; ESLint v9.29.0

Dr. Axel Rauschmayer and Johannes Weber — Wed, 18 Jun 2025 08:03:00 GMT

Exploring JavaScript ES2025 edition

Resilient import maps: fixing their limitations

Node v24.2.0 (current): import.meta.main and more

Testing tools

Jest 30: improved ESM support and more

Rstest: Rspack-based testing framework

Linting tools

Announcing Oxlint 1.0

How ESLint language plugins enhance DSL usability

ESLint v9.29.0: support for explicit resource management (using) and more

Prettier 3.6; Biome v2; JSON modules; top-level await; Web Engines Hackfest

Dr. Axel Rauschmayer and Johannes Weber — Wed, 25 Jun 2025 08:03:00 GMT

Secure your JavaScript dependencies. (Sponsor)

Prettier 3.6: experimental fast CLI, OXC plugin and more

Biome v2 (“Biotype”): type-aware linting without tsc

JSON module scripts are now Baseline Newly Available

Using await at the top level in ES modules

Videos: Web Engines Hackfest 2025

ECMAScript 2025; iterator helpers; recently advanced ES proposals; new Ecma members; security webinar; Vite 7.0; Node v24.3.0; ESLint v9.30.0

Dr. Axel Rauschmayer and Johannes Weber — Wed, 02 Jul 2025 08:03:00 GMT

Ecma International approves ECMAScript 2025: What’s new?

Iterator helpers supported across all browsers

What’s coming to JavaScript: recently advanced ECMAScript proposals

Ecma International welcomes new members

Securing your build pipeline (webinar, July 9th & July 16th)

New versions

Vite 7.0 is out

Node v24.3.0 (current): improved fs.watch, no more experimental warnings for type-stripping, and more

ESLint v9.30.0: basePath property in config objects and more

JS1024 competition; 10 JS milestones; internationalization at Patreon; call JS from other languages; Node.js Worker Threads; ordinary functions vs. arrow functions; default parameters; 2025-05 TC39 meeting; Babel 7.28.0; Rspack 1.4; Deno 2.4; Bun v1.2.18

Dr. Axel Rauschmayer and Johannes Weber — Wed, 09 Jul 2025 08:03:00 GMT

Detect suspicious package updates in real-time. (Sponsor)

JS1024: annual JavaScript golfing competition [deadline: July 19]

30 years of JavaScript: 10 milestones that changed the web

Patreon’s internationalization overhaul

JSii: invoke TypeScript code from Python, Go, Java, C#, etc.

Language features

Worker Threads in Node.js: complete guide for multithreading in JavaScript

What’s the difference between ordinary functions and arrow functions in JavaScript?

Default parameters: Your code just got smarter

Summary of the May 2025 TC39 plenary

New versions

Babel 7.28.0: babel.config.ts, explicit resource management, discard binding proposal, and more

Rspack 1.4: running in the browser, smaller bundles, incremental by default, CssChunkingPlugin and more

Deno 2.4: deno bundle is back

Bun v1.2.18: ReadableStream methods .text(), .json(), .bytes(), .blob(); and more

Exploring JS ES2025; Date quiz; bundling; Array.fromAsync(); Promise.all() vs. Promise.allSettled(); Temporal API; Node.js v24.4.0; ESLint v9.31.0; Biome 2.1; pnpm 10.13

Dr. Axel Rauschmayer and Johannes Weber — Wed, 16 Jul 2025 08:03:00 GMT

Exploring JavaScript ES2025 edition (Partner)

Quiz: How well do you know JavaScript’s Date class?

Bundling JavaScript via scope hoisting is broken

Language features

Modern async iteration in JavaScript with Array.fromAsync()

Promise.all() vs. Promise.allSettled() in JavaScript

When can I use the JavaScript Temporal API?

New versions

Node.js v24.4.0 (current): fsPromises.mkdtempDisposable(), spawn() propagates permission flags, SQLite options per connection, and more

ESLint v9.31.0: support for explicit resource management in core rules and more

Biome 2.1: faster scanner, improved type inference, new rules and more

pnpm 10.13: easier plugin installation, loading multiple pnpmfiles, and more

E18e community showcase; datetime library; microtasks; regular expression algorithm; Temporal API; cost of dependencies; dependency thoughts; esbuild v0.25.7; Bun v1.2.19

Dr. Axel Rauschmayer and Johannes Weber — Wed, 23 Jul 2025 08:03:00 GMT

e18e (Ecosystem Performance) community showcase: Prettier CLI, e18e CLI, ESM-only migration, and more

ream.js: functional datetime library with immutable data structures

Reach JavaScript developers through an ad on ECMAScript News (Sponsor)

JavaScript microtasks and the event loop

Linear matching of JavaScript regular expressions

Talk about the upcoming Temporal API by one of its creators

Dependencies

“Not invented here” (NIH) is far cheaper than the wrong dependency

Dependency thoughts

New versions

esbuild v0.25.7: import defer, import source, and more

Bun v1.2.19: pnpm-style node_modules, interactive dependency management, and more

20 years of MDN; JS runtimes; minification doesn’t matter much; utility library es-toolkit; better .env files; Wasm-based plugins; package `is` hijacked; package `stylus` removed; securely building open source packages; auditing npm packages; ESLint v9.32.0

Dr. Axel Rauschmayer and Johannes Weber — Wed, 30 Jul 2025 08:03:00 GMT

Celebrating 20 years of MDN

The many, many, many JavaScript runtimes of the last decade

Minification doesn’t matter much (and has downsides) – thanks to gzip compression

Libraries and tools

es-toolkit: utility library with Lodash compatibility layer

varlock: write .env files with type information and validate, generate types, etc.

Extism: multi-language plugin system based on WebAssembly

Security

npm package is hijacked in expanding supply chain attack

npm ‘accidentally’ removes package stylus, breaks builds and pipelines

Google’s OSS Rebuild: securely building open source packages

NPQ: open source CLI tool that audits and protects npm installs from malicious packages

New versions

ESLint v9.32.0: rules updated for explicit resource management, and more

State of JS 2025; npm security plans; JS Handbook 2025 edition; storing data in bigints; library for Temporal API; npm attack; pnpm

Dr. Axel Rauschmayer and Johannes Weber — Wed, 01 Oct 2025 08:03:00 GMT

Survey (Oct 1–Nov 1): “State of JavaScript 2025”

npm: “Our plan for a more secure npm supply chain”

The JavaScript Handbook, 2025 edition (free with newsletter subscription)

Storing unwise amounts of data in JavaScript bigints

temporal_rs library powers JavaScript’s Temporal API in the engines V8, Boa and Kiesel

Podcasts

PodRocket podcast: Unpacking the npm supply chain attacks with Feross Aboukhadijeh

devtools.fm podcast: Zoltan Kochan – pnpm and the future of package management

Prettier’s story; intercepting boolean coercion; VoidZero’s newsletter; JS typing speed challenge; Socket firewall; publishing npm packages securely; npm security best practices

Dr. Axel Rauschmayer and Johannes Weber — Wed, 08 Oct 2025 08:03:00 GMT

The story of Prettier

I want to intercept boolean coercion for objects in JavaScript

VoidZero’s new newsletter: “Stay ahead of the curve with exclusive insights into the future of JavaScript tooling”

JavaScript typing speed challenge

npm security

Introducing Socket Firewall: free, proactive protection for your software supply chain

e18e: best practices on publishing npm packages securely using GitHub Actions

npm security best practices

Announcing Vite+; performance of var; simulating JS piping; AbortController; editing JSONC; Node.js features vs. packages; what’ll be in ESLint v10.0.0; ESLint Config Inspector

Dr. Axel Rauschmayer and Johannes Weber — Wed, 15 Oct 2025 08:03:00 GMT

Announcing Vite+

Why does the TypeScript code base have so many var declarations?

asPipes: working pipes today in pure JavaScript

Don’t sleep on AbortController

First-class JSONC manipulation in JavaScript

15 recent Node.js features that replace popular npm packages

ESLint

What’s coming in ESLint v10.0.0

ESLint Config Inspector: visual tool for inspecting and understanding your ESLint flat configs

Future of Lodash; Oxlint JS plugins; Deno’s open source projects; toolchains; glob matching library; Vite documentary; shipping Node.js packages; Bun 1.3; Node.js v24.10.0

Dr. Axel Rauschmayer and Johannes Weber — Wed, 22 Oct 2025 08:03:00 GMT

The future of Lodash

Announcing Oxlint JavaScript plugin support

Deno’s other open source projects

Toolchains: user experience, tools to include, foundational knowledge, etc.

Zeptomatch: small glob matching library

Videos

Vite: The Documentary

Shipping Node.js packages in 2025

New versions

Bun 1.3: improved full-stack tooling (dev server, workspace features, etc.)

Node.js v24.10.0 (current): SQLite authorization API and more

Importing vs. fetching JSON; async loops; NaN and IEEE 754; URLPattern; Vitest 4.0; Biome v2.3; esbuild v0.25.11; JS compiler Porffor; source maps; JSConf 2025; ViteConf 2025

Dr. Axel Rauschmayer and Johannes Weber — Wed, 29 Oct 2025 09:03:00 GMT

Importing vs. fetching JSON

Rethinking async loops in JavaScript

Why NaN !== NaN in JavaScript (and the IEEE 754 story behind it)

URLPattern is now Baseline Newly Available

New versions

Vitest 4.0: Browser Mode stable, visual regression testing, Playwright trace files

Biome v2.3.: support for Vue, Svelte, Astro and more

esbuild v0.25.11: import with { type: 'bytes' } and more

Podcasts

Oliver Medhurst: Porffor – JavaScript Ahead of Time Compiler [49-min. audio]

Source maps: how does the magic work? with Nicolo Ribaudo [26-min. video]

Recent conferences

Videos: JSConf 2025

Videos: ViteConf 2025

ViteConf 2025 recap

Vite ecosystem in October; e18e community showcase; Node.js migrations; staying safe on npm; performance of optional chaining; concurrency library Pronto; implementing a DB; supply chain attacks; JS prototype pollution; Rspack 1.6; ESLint v9.39.0

Dr. Axel Rauschmayer and Johannes Weber — Wed, 05 Nov 2025 09:03:00 GMT

What’s new in ViteLand: October 2025 recap

Ecosystem Performance (e18e): community showcase 2025-Q3

Migrating to new Node.js versions via codemods

Five practical steps to stay safe on npm

No-op functions vs. optional chaining in JavaScript: performance deep dive

Pronto: manage concurrency via distributed message passing and functional patterns

How to build a key-value database from scratch (with JavaScript code)

New MDN content

New on MDN: Supply chain attacks

New on MDN: JavaScript prototype pollution

New Versions

Rspack 1.6: enhanced tree shaking, import defer, and more

ESLint v9.39.0: more precise problem locations, unified rule performance report, and more

HTML Sanitizer API; Exploring JS ES2025; pnpm 10.21; error chaining; source maps; from Python to Node.js

Dr. Axel Rauschmayer and Johannes Weber — Wed, 12 Nov 2025 09:03:00 GMT

setHTML(), Trusted Types and the Sanitizer API

Exploring JavaScript ES2025 edition (Partner)

pnpm 10.21: installing Node.js runtimes for dependencies, not installing dependencies with decreased trust levels, and more

Error chaining in JavaScript: cleaner debugging with Error.cause

The inner workings of JavaScript source maps

Why we migrated from Python to Node.js

Npm TEA protocol spam; module-replacements 2.10.0; the story of tinyglobby; V8’s garbage collector; JSNation 2025 videos; C/JS/AWK compiler; implementing Wordle in LibreOffice

Dr. Axel Rauschmayer and Johannes Weber — Wed, 19 Nov 2025 09:03:00 GMT

Another round of TEA protocol spam floods npm, but it’s not a worm

module-replacements 2.10.0: list of npm packages with better alternatives (built-in APIs, smaller packages, …)

Book (free online): “Exploring TypeScript” (Partner)

tinyglobby: a success story in modernization and performance

The last couple of years in V8’s garbage collector

Conference videos: JSNation 2025

Experiments

cjsawk: self-hosted compiler for code in the intersection of C, JavaScript and AWK

Implementing Wordle in LibreOffice with JavaScript macros

Dr. Axel Rauschmayer and Johannes Weber — Wed, 26 Nov 2025 09:03:00 GMT