hello-express
quickjs-emscripten
hello-express | quickjs-emscripten | |
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88 | 21 | |
7 | 1,122 | |
- | - | |
0.0 | 9.4 | |
over 3 years ago | 17 days ago | |
JavaScript | TypeScript | |
- | GNU General Public License v3.0 or later |
Stars - the number of stars that a project has on GitHub. Growth - month over month growth in stars.
Activity is a relative number indicating how actively a project is being developed. Recent commits have higher weight than older ones.
For example, an activity of 9.0 indicates that a project is amongst the top 10% of the most actively developed projects that we are tracking.
hello-express
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Social bookmarks in the Fediverse
Postmarks runs on Glitch - or, anywhere else you can stand up a Node.js / Express app. Personally I love Glitch, and I've been using it for many years now for hosting demos and trying out different projects - in fact, my main links page runs on Glitch. The Postmarks developer Casey Kolderup works there, and Casey has made it really straightforward to remix directly on Glitch, or import from GitHub there or to another service of your choice - it has very few dependencies.
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Show HN: Mu – A Micro App Platform
So kind of like https://glitch.com/ and https://inbrowser.app/ but somehow productized, has a bitcoin donation button, and uses iframes(??). Feels pretty slow too, but that might just be the HN hug of death.
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Learn about XSS, submit your app of the week, have an AI make you a mixtape, and other things to do when it's too hot outside
The Glitch team has been doing some gardening of our own over the past few weeks: the latest addition to our new homepage is our new weekly feature, “App of the Week.” As I type this, we’re featuring a classic: Dan Reeves’ Nasa logo generator. Next week: your favorite app? Your latest creation? Send your submissions here and help us shine a spotlight on all the coolest (even in this heat) apps in the universe.
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Build web apps and mixed reality experiences while you hear from the folks keeping the largest Mastodon instance running
Happy June! Everyone seems to either be wrapping up the school year or finishing up projects at work ahead of trips to the beach – or whatever it is that humans do when it gets this warm out. Our team’s been busy too; in case you missed it, we launched a new Glitch homepage, created new starter apps to celebrate Apple’s expanding support for progressive web apps and open VR/XR, and made huge progress in letting the Glitch community tap into all of Fastly’s features for supercharging your apps – we’ll be sharing more about this very soon!
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Windows 11 in Svelte
I’ve seen some people use Glitch for experimental web projects.
https://glitch.com/
- An experienced front-ender: where next?
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Making a Heardle
I'm making a custom heardle using the 'zayn-heardle' template on https://glitch.com. The search-bar for searching for songs is not working. It doesn't show any options to pick a song.
- Ask HN: Why don't smartphones encourage programming like early 80s computers?
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AI is helping developers pull pranks and gags but will it replace us?
See you on glitch.com! Jenn, Director of Community 👽
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sign_in_with_apple for Flutter Web
I've implemented the package https://pub.dev/packages/sign_in_with_apple successfully both for iOS and Android devices (my back-end is glitch.com, copied from the package's instructions).
quickjs-emscripten
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New QuickJS Release
Based on your comment below I think you figured out the difference - but if you're looking to execute JS, you can pick between ShadowRealm (where available, or using a polyfill) or my library quickjs-emscripten.
Pros of quickjs-emscripten over ShadowRealm:
- You can use quickjs today in any browser with WASM. ShadowRealm isn't available yet, and polyfills have had security issues in the past. See https://www.figma.com/blog/an-update-on-plugin-security/
- In ShadowRealm eval, untrusted code can consume arbitrary CPU cycles. With QuickJS, you can control the CPU time used during an `eval` using an [interrupt handler] that's called periodically during the eval.
- In ShadowRealm eval, untrusted code can allocate arbitrary amounts of memory. With QuickJS, you can control both the [stack size] and the [heap size] available inside the runtime.
- quickjs-emscripten can do interesting things with custom module loaders and facades that allow synchronous code inside the runtime to call async code on the host.
Pros of ShadowRealm over QuickJS:
- ShadowRealm will (presumably?) execute code using your native runtime, probably v8, JavaScriptCore, or SpiderMonkey. Quickjs is orders of magnitude slower than JIT'd javascript performance of v8 etc. It's also slower than v8/JSC's interpreters, although not by a huge amount. See [benchmarks] from 2019.
- You can easily call and pass values to ShadowRealm imported functions. Talking to quickjs-emscripten guest code requires a lot of fiddly and manual object building.
- Overall the quickjs(-emscripten) API is verbose, and requires manual memory management of references to values inside the quickjs runtime.
[interrupt handler]: https://github.com/justjake/quickjs-emscripten/blob/main/doc...
[stack size]: https://github.com/justjake/quickjs-emscripten/blob/main/doc...
[heap size]: https://github.com/justjake/quickjs-emscripten/blob/main/doc...
[benchmarks]: https://bellard.org/quickjs/bench.html
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Extism Makes WebAssembly Easy
The thing I want to achieve with WebAssembly is still proving a lot harder than I had anticipated.
I want to be able to take strings of untrusted code provided by users and execute them in a safe sandbox.
I have all sorts of things I want this for - think custom templates for a web application, custom workflow automation scripts (Zapier-style), running transformations against JSON data.
When you're dealing with untrusted code you need a really robust sandbox. WebAssembly really should be that sandbox.
I'd like to support Python, JavaScript and maybe other languages too. I want to take a user-provided string of code in one of those languages and execute that in a sandbox with a strict limit on both memory usage and time taken (so I can't be crashed by a "while True" loop). If memory or time limit are exceeded, I want to get an exception which I can catch and return an error message to the user.
I've been exploring options for this for quite a while now. The furthest I've got was running Pyodide inside of Deno: https://til.simonwillison.net/deno/pyodide-sandbox
Surprisingly I've not found a good pattern for running a JavaScript interpreter in a WASM sandbox yet. https://github.com/justjake/quickjs-emscripten looks promising but I've not found the right recipe to call it from server-side Python or Deno yet.
Can Extism help with this? I'm confident I'm not the only person who's looking for a solution here!
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Node on Web. Use Nodejs freely in your browser with Linux infrastructure.
"Safely execute untrusted Javascript in your Javascript, and execute synchronous code that uses async functions" quickjs-emscripten, NPM
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Sandboxing JavaScript Code
This maybe, as a start?
https://github.com/justjake/quickjs-emscripten
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Hacker News top posts: Nov 20, 2022
QuickJS Running in WebAssembly\ (17 comments)
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QuickJS Running in WebAssembly
The library was inspired by Figma’s blog posts about their plug-in system: https://github.com/justjake/quickjs-emscripten#background
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Show HN: Run unsafe user generated JavaScript in the browser
If you need to call into user-generated Javascript synchronously or have greater control over the sandbox environment, you can use WebAssembly to run a Javascript interpreter: https://github.com/justjake/quickjs-emscripten#quickjs-emscr...
QuickJS in WebAssembly is much slower than your browser's native Javascript runtime, but possibly faster than async calls using postMessage. As an added bonus, it can make async functions in the host appear to be synchronous inside the sandbox using asyncify: https://emscripten.org/docs/porting/asyncify.html.
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Why Would Anyone Need JavaScript Generator Functions?
You can use One Weird Trick with generator functions to make your code "generic" over synchronicity. I use this technique to avoid needing to implement both sync and async versions of some functions in my quickjs-emscripten library.
The great part about this technique as a library author is that unlike choosing to use a Promise return type, this technique is invisible in my public API. I can write a function like `export function coolAlgorithm(getData: (request: I) => O | Promise): R | Promise`, and we get automatic performance improvement if the user's function happens to return synchronously, without mystery generator stuff showing up in the function signature.
Helper to make a function that can be either sync or async: https://github.com/justjake/quickjs-emscripten/blob/ff211447...
Uses: https://cs.github.com/justjake/quickjs-emscripten?q=yield*+l...
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Why Am I Excited About WebAssembly?
This seems like a pretty nice, recently enabled way of getting a sandboxed js environment: QuickJS compiled to WASM: https://github.com/justjake/quickjs-emscripten.
What are some alternatives?
dart-pad - An online Dart editor with support for console, web, and Flutter apps
wasmtime - A fast and secure runtime for WebAssembly
codesandbox-client - An online IDE for rapid web development
wasmer - 🚀 The leading Wasm Runtime supporting WASIX, WASI and Emscripten
neocities - Neocities.org - the web site. The entire thing. Yep, we're completely open source.
wizer - The WebAssembly Pre-Initializer
my-glitch-in-bio - A link in bio site, based on the Glitch in Bio template, on Glitch
rr - Record and Replay Framework
pages-gem - A simple Ruby Gem to bootstrap dependencies for setting up and maintaining a local Jekyll environment in sync with GitHub Pages
go - The Go programming language
iconify - Universal icon framework. One syntax for FontAwesome, Material Design Icons, DashIcons, Feather Icons, EmojiOne, Noto Emoji and many other open source icon sets (over 150 icon sets and 200k icons). SVG framework, React, Vue and Svelte components!
iPlug2 - C++ Audio Plug-in Framework for desktop, mobile and web