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ECMAScript 2022; block statements; void 0

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

Dear readers!

We are taking a mid-year break and will be back on September 13. Have a great July and August!

Jowe & Axel



Ecma International approves ECMAScript 2022: What’s new?
2ality.com   @2ality
New features in ECMAScript 2022:
  • New members of classes:
    • Properties (public slots) can now be created via instance public fields and static public fields.
    • Private slots are new and can be created via:
      • Private fields (instance private fields and static private fields)
      • Private methods and accessors (non-static and static)
    • Static initialization blocks
  • Private slot checks via in
  • Top-level await in modules
  • error.cause
  • Method .at() of indexable values (strings, Arrays, TypedArrays)
  • RegExp match indices
  • Object.hasOwn(obj, propKey)


Secretary General of Ecma International (host of TC39)
www.ecma-international.org Sponsor
The job opportunity of a lifetime: You could be the Secretary General of Ecma, helping run the international standards body which oversees TC39 (home of ECMAScript) and many other Technical Committees. If you can work in Geneva and love standards, please apply!


In defense of blocks for local scopes
gist.github.com   @getify
Kyle Simpson argues in favor of using block statements to give a sequence of statements its own scope.


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You don’t need void 0 in JavaScript
p42.ai   @lgrammel, @p42ai
In JavaScript code, especially if it’s older, you may have seen void 0 being used as an alternative to undefined. This blog post explains:
  • Why void 0 is an alternative to undefined.
  • Why avoiding undefined made sense before ECMAScript 6.
  • Why that’s not necessary anymore.
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Key phrases

many other Technical Committees RegExp Match Indices Private slot checks instance public fields static public fields instance private fields static private fields Dr Axel Rauschmayer Static initialization blocks international standards body

Older messages

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

Tuesday, June 21, 2022

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 Prettier 2.7: new --

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

Tuesday, June 14, 2022

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 TC39

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

Tuesday, June 7, 2022

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 Node v18.3.0 (current):

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

Tuesday, May 31, 2022

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 Parcel v2.6.0 parceljs.

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

Tuesday, May 24, 2022

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 Babel 7.18.0:

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