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

ES.nextNews: the latest in JavaScript and cross-platform tools
Curated by Dr. Axel Rauschmayer and Johannes Weber.

ES.next News

The latest in JavaScript and cross-platform tools

Updates from the TC39 meeting in January 2023
dev.to @hemanth

Stage changes for ECMAScript proposals:

Stage 4:
- Change Array by copy
- Symbols as WeakMap keys
Stage 3:
- ArrayBuffer.prototype.transfer and friends
- Sync Iterator helpers (originally part of “Iterator helpers”)
Stage 2:
- Import assertions (demoted from stage 3)
- Symbol predicates
- Async Iterator helpers (originally part of “Iterator helpers”)
Stage 1:
- Async context
- Prototype pollution mitigation

Node v19.6.0 (Current)
nodejs.org @ruyadorno, @nodejs

Highlights:

ESM loaders now apply to subsequent loaders, for example:

--experimental-loader ts-node --experimental-loader loader-written-in-typescript

fs.statfs() returns information about the mounted file system which contains a given path.

Vite 4.1.0
github.com @patak-dev, @vitejs

Highlights:

Add experimental option to skip SSR transform
Reproducible manifest
Support BROWSER and BROWSER_ARGS in env file
Clear console by pressing “C”

Go-like channel in 10 lines of JavaScript
pedrocattori.dev @pcattori

In Go, concurrently running functions can coordinate by writing and reading from “channels”. In JavaScript, we can do the same via “remotely resolving” Promises (for single values).

Speeding up the JavaScript ecosystem – ESLint
marvinh.dev @marvinhagemeister

Quoting the blog post: “Linting is the act of finding patterns in code that could lead to mistakes or ensure a consistent reading experience. It’s a core piece of many JavaScript/TypeScript projects. We found lots of potential for time savings in their selector engine and AST conversion process and a perfect linter written in JS would be able to hit sub-second run times.”

10% discount for Axel’s JavaScript books
exploringjs.com Sponsor @rauschma

In celebration of Groundhog Day, the coupon code GROUNDHOG2023 (expires in a week) gets you a 10% discount for Axel Rauschmayer’s JavaScript books (“JS for impatient programmers”, “Deep JS”, “Tackling TS”, “Shell scripting with Node.js”):

Go to the Payhip product page (follow the links from exploringjs.com).
Click on “Buy Now”.
At the bottom, click on “Add coupon” and enter the code.

(There won’t be a new edition of “JS for impatient programmers” this year; the next edition will come out in 2024.)

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Dr Axel Rauschmayer Prototype pollution mitigation Sync Iterator helpers

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

The latest in JavaScript and cross-platform tools

Key phrases

Older messages

Bun v0.5; manipulating URLs; speeding up JavaScript

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

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

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

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

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