Guy Bedford
@guybedford.com
Rabbit hole explorer. Working on JS & WebAssembly at Cloudflare. TC39. Creator https://jspm.org.
Reposted by Guy Bedford
PSA: If you want to use standard CSS Modules before they ships in Safari and Firefox, I built a Rollup plugin to support them:
www.npmjs.com/package/roll...
Converting CSS Modules to JS this way also support bundling before @sheet (which lets you put multiple stylsheets in one CSS file) lands.
www.npmjs.com/package/roll...
Converting CSS Modules to JS this way also support bundling before @sheet (which lets you put multiple stylsheets in one CSS file) lands.
rollup-plugin-css-modules
Rollup support for standard CSS modules. Latest version: 0.1.2, last published: 2 years ago. Start using rollup-plugin-css-modules in your project by running `npm i rollup-plugin-css-modules`. There a...
www.npmjs.com
August 13, 2025 at 4:57 PM
PSA: If you want to use standard CSS Modules before they ships in Safari and Firefox, I built a Rollup plugin to support them:
www.npmjs.com/package/roll...
Converting CSS Modules to JS this way also support bundling before @sheet (which lets you put multiple stylsheets in one CSS file) lands.
www.npmjs.com/package/roll...
Converting CSS Modules to JS this way also support bundling before @sheet (which lets you put multiple stylsheets in one CSS file) lands.
Reposted by Guy Bedford
Reposted by Guy Bedford
We're hiring JavaScriptCore VM engineers in Cupertino, CA. Good opportunity to work on some truly foundational tech that underpins web performance in Apple products.
jobs.apple.com/en-us/detail...
jobs.apple.com/en-us/detail...
JavaScript Virtual Machine Compiler Engineer - Jobs - Careers at Apple
Apply for a JavaScript Virtual Machine Compiler Engineer job at Apple. Read about the role and find out if it’s right for you.
jobs.apple.com
July 3, 2025 at 4:38 AM
We're hiring JavaScriptCore VM engineers in Cupertino, CA. Good opportunity to work on some truly foundational tech that underpins web performance in Apple products.
jobs.apple.com/en-us/detail...
jobs.apple.com/en-us/detail...
Fascinating writeup by @hoodmane.bsky.social of Pyodide's WebAssembly JS promise integration, including a description and fix for the linear memory stack reentrancy problem.
blog.pyodide.org/posts/jspi-w...
blog.pyodide.org/posts/jspi-w...
Integrating JSPI with the WebAssembly C Runtime
Using JSPI with C code compiled to the wasm32-unknown-unknown target
blog.pyodide.org
July 3, 2025 at 2:20 PM
Fascinating writeup by @hoodmane.bsky.social of Pyodide's WebAssembly JS promise integration, including a description and fix for the linear memory stack reentrancy problem.
blog.pyodide.org/posts/jspi-w...
blog.pyodide.org/posts/jspi-w...
Reposted by Guy Bedford
JSPM 4.0: dependency management via import maps in browsers (benefits: reduced tooling and more)
@guybedford.com
jspm.org/jspm-4.0-rel...
#ECMAScript #JavaScript
@guybedford.com
jspm.org/jspm-4.0-rel...
#ECMAScript #JavaScript
JSPM - JSPM 4.0 Release
JSPM 4.0 release post featuring a refreshed local development workflow for modern standards
jspm.org
May 26, 2025 at 8:39 PM
JSPM 4.0: dependency management via import maps in browsers (benefits: reduced tooling and more)
@guybedford.com
jspm.org/jspm-4.0-rel...
#ECMAScript #JavaScript
@guybedford.com
jspm.org/jspm-4.0-rel...
#ECMAScript #JavaScript
Npm dependencies not being fully scoped is kind of an npm limitation I suppose? Import maps avoid this property.
May 15, 2025 at 4:31 PM
Npm dependencies not being fully scoped is kind of an npm limitation I suppose? Import maps avoid this property.
Reposted by Guy Bedford
First update on the open source I've been working on this past month:
ES Module Shims 2.5 - featuring hot reloading for native modules.
guybedford.com/hot-reloadin...
ES Module Shims 2.5 - featuring hot reloading for native modules.
guybedford.com/hot-reloadin...
ES Module Shims 2.5 Release Update
ES Module Shims 2.5 release update, including hot reloading, import defer and new baseline feature support.
guybedford.com
May 12, 2025 at 8:13 PM
First update on the open source I've been working on this past month:
ES Module Shims 2.5 - featuring hot reloading for native modules.
guybedford.com/hot-reloadin...
ES Module Shims 2.5 - featuring hot reloading for native modules.
guybedford.com/hot-reloadin...
The simple approach came as a nice surprise to me too. Other coming modules features are likely a bit harder!
May 12, 2025 at 10:18 PM
The simple approach came as a nice surprise to me too. Other coming modules features are likely a bit harder!
First update on the open source I've been working on this past month:
ES Module Shims 2.5 - featuring hot reloading for native modules.
guybedford.com/hot-reloadin...
ES Module Shims 2.5 - featuring hot reloading for native modules.
guybedford.com/hot-reloadin...
ES Module Shims 2.5 Release Update
ES Module Shims 2.5 release update, including hot reloading, import defer and new baseline feature support.
guybedford.com
May 12, 2025 at 8:13 PM
First update on the open source I've been working on this past month:
ES Module Shims 2.5 - featuring hot reloading for native modules.
guybedford.com/hot-reloadin...
ES Module Shims 2.5 - featuring hot reloading for native modules.
guybedford.com/hot-reloadin...
Interesting experiment - Google’s experimenting with performance exceptions in the origin-segmented script cache, seemingly primarily for their own advertising, YouTube and Google Maps scripts.
bsky.app/profile/inte...
bsky.app/profile/inte...
Blink: Intent to Experiment: Cache sharing for extremely-pervasive scripts
Blink: Intent to Experiment: Cache sharing for extremely-pervasive scripts
Blink: Intent to Experiment: Cache sharing for extremely-pervasive scripts
groups.google.com
April 23, 2025 at 4:18 PM
Interesting experiment - Google’s experimenting with performance exceptions in the origin-segmented script cache, seemingly primarily for their own advertising, YouTube and Google Maps scripts.
bsky.app/profile/inte...
bsky.app/profile/inte...
Excited to announce I'll be joining Cloudflare next month as a Systems Engineer on the Workers Runtime team, continuing to work on the platform-level intersection of JavaScript and WebAssembly.
And in the mean time, I will be taking a much needed break and dusting off some OSS work...
And in the mean time, I will be taking a much needed break and dusting off some OSS work...
April 22, 2025 at 6:25 PM
Excited to announce I'll be joining Cloudflare next month as a Systems Engineer on the Workers Runtime team, continuing to work on the platform-level intersection of JavaScript and WebAssembly.
And in the mean time, I will be taking a much needed break and dusting off some OSS work...
And in the mean time, I will be taking a much needed break and dusting off some OSS work...
Reposted by Guy Bedford
Blink: Intent to Prototype: Source phase imports
Blink: Intent to Prototype: Source phase imports
Blink: Intent to Prototype: Source phase imports
groups.google.com
March 27, 2025 at 9:43 PM
Blink: Intent to Prototype: Source phase imports
Stripped down packuments seem to be scaling surprisingly well even for these huge numbers of versions. Wonder when it breaks down though.
February 10, 2025 at 1:09 AM
Stripped down packuments seem to be scaling surprisingly well even for these huge numbers of versions. Wonder when it breaks down though.
It blows my mind when JS packages publish for every commit and end up with thousands of versions on npm.
For example Primer React (www.npmjs.com/package/@pri...) publishes ~20 - 30 times a day via commit-based CI.
Good dev pattern, or misuse of npm?
For example Primer React (www.npmjs.com/package/@pri...) publishes ~20 - 30 times a day via commit-based CI.
Good dev pattern, or misuse of npm?
@primer/react
An implementation of GitHub's Primer Design System using React. Latest version: 37.12.0, last published: 3 days ago. Start using @primer/react in your project by running `npm i @primer/react`. There a...
www.npmjs.com
February 10, 2025 at 12:39 AM
It blows my mind when JS packages publish for every commit and end up with thousands of versions on npm.
For example Primer React (www.npmjs.com/package/@pri...) publishes ~20 - 30 times a day via commit-based CI.
Good dev pattern, or misuse of npm?
For example Primer React (www.npmjs.com/package/@pri...) publishes ~20 - 30 times a day via commit-based CI.
Good dev pattern, or misuse of npm?
Reposted by Guy Bedford
Announcing ES Module Shims 2.0. The latest version of what started out as an import maps polyfill now supports production polyfilling of more than 8 existing and upcoming native browser modules features 🧵
January 27, 2025 at 8:03 AM
Announcing ES Module Shims 2.0. The latest version of what started out as an import maps polyfill now supports production polyfilling of more than 8 existing and upcoming native browser modules features 🧵
Yes, it’s one exception for convenience here given we don’t have a well defined mime type for typescript. In a true type stripping future there maybe wouldn’t ever be one as well.
January 27, 2025 at 6:05 PM
Yes, it’s one exception for convenience here given we don’t have a well defined mime type for typescript. In a true type stripping future there maybe wouldn’t ever be one as well.
Lexing JavaScript / TypeScript is very much the definition of an interpreter. Unless you don’t want to use an interpreter language…
January 27, 2025 at 4:39 PM
Lexing JavaScript / TypeScript is very much the definition of an interpreter. Unless you don’t want to use an interpreter language…
Since JS modules require application/javascript, we default to processing application/typescript and any .ts or .mts files not served with an otherwise valid JS Mime.
January 27, 2025 at 4:37 PM
Since JS modules require application/javascript, we default to processing application/typescript and any .ts or .mts files not served with an otherwise valid JS Mime.
Exactly, and only when Typescript is first encountered. Didn’t do any comparisons yet, that would be a good idea to try other libraries like this one.
January 27, 2025 at 4:35 PM
Exactly, and only when Typescript is first encountered. Didn’t do any comparisons yet, that would be a good idea to try other libraries like this one.
See the announcement post for an example of running a TypeScript Vue app with #nobuild.
Other recent features including Wasm modules with source phase imports and multiple import maps are also explained in more detail.
guybedford.com/es-module-sh...
Other recent features including Wasm modules with source phase imports and multiple import maps are also explained in more detail.
guybedford.com/es-module-sh...
Announcing ES Module Shims 2.0
ES Module Shims 2.0 release post, featuring TypeScript type stripping, Wasm modules, source phase imports and multiple import maps support.
guybedford.com
January 27, 2025 at 8:03 AM
See the announcement post for an example of running a TypeScript Vue app with #nobuild.
Other recent features including Wasm modules with source phase imports and multiple import maps are also explained in more detail.
guybedford.com/es-module-sh...
Other recent features including Wasm modules with source phase imports and multiple import maps are also explained in more detail.
guybedford.com/es-module-sh...
A major new feature of this release is a development convenience - TypeScript type stripping support per the proposed type stripping proposal, fully supporting in-browser transpilation of TypeScript.
January 27, 2025 at 8:03 AM
A major new feature of this release is a development convenience - TypeScript type stripping support per the proposed type stripping proposal, fully supporting in-browser transpilation of TypeScript.
Announcing ES Module Shims 2.0. The latest version of what started out as an import maps polyfill now supports production polyfilling of more than 8 existing and upcoming native browser modules features 🧵
January 27, 2025 at 8:03 AM
Announcing ES Module Shims 2.0. The latest version of what started out as an import maps polyfill now supports production polyfilling of more than 8 existing and upcoming native browser modules features 🧵