Acorn
swc
Acorn | swc | |
---|---|---|
13 | 139 | |
10,230 | 30,053 | |
0.8% | 0.8% | |
7.9 | 9.9 | |
17 days ago | 2 days ago | |
JavaScript | Rust | |
MIT License | Apache License 2.0 |
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.
Acorn
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Abstract Syntax Trees and Practical Applications in JavaScript
Why do we then have other JavaScript parsers like babel parser, swc parser, acorn, espree and the likes since JavaScript engines have their own internal parsers?
- Árvore de sintaxe abstrata, oque são e aonde vivem.
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Regex for any js string for representing an object or array containing any number of array or object?
If you're trying to determine if a string is valid Javascript then your best bet is to use a JS parser like Acorn. Trying to DIY parsing with just regex is a good way to end up incredibly frustrated.
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Code Art — abstract artworks for your creations
To render UI I use Svelte. To parse JS files I use Acorn JS in Web Worker.
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What is Babel? And SWC?
Behind Babel is created by an Australian developer Sebastian McKenzie and now consists a small team of contributors. Babel also makes uses a polyfill library called core-js, which in turn uses a JavaScript parser, acorn.
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🕶 What it takes to build a Static Analysis tool
At line 3, we import parseScript from meriyah which is a JavaScript parser (could have been babel, acorn, swc, etc doesn't matter for our use case as long as they correctly implement the spec).
- Acorn: A lightweight PaaS for Kubernertes, from Rancher founders
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[AskJS] What is your preferred tooling when working with JS ASTs?
A simple starting point is Acorn with estree-walker. Not sure if you'll need more advanced functionality but that pair has worked well for my usage. It's also the combo that Svelte uses internally.
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How do I edit an AST while parsing it?
https://github.com/acornjs/acorn For parsing the tree
- Show HN: Monocle – bidirectional code generation library
swc
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Storybook 8 Beta
First, we switched the default compiler for new projects from Babel to SWC (Speedy Web Compiler). SWC is dramatically faster than Babel and requires zero configuration. We’ll continue to support Babel in any project currently using it.
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What is JSDoc and why you may not need typescript for your next project?
SWC
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Implementing auth flow as fast as possible using NestJS
As the reference explains “**SWC** (Speedy Web Compiler) is an extensible Rust-based platform that can be used for both compilation and bundling. Using SWC with Nest CLI is a great and simple way to significantly speed up your development process.”
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Ruby Outperforms C: Breaking the Catch-22
This is specifically about breaking the myth that performing expensive self-contained operations (e.g, parsing GraphQL) in a native extension (C, Rust, etc.) is always faster than the interpreted language.
The JS ecosystem has the same problem, people think rewriting everything in Rust will be a magic fix. In practice, there's always the problem highlighted in the post (transitioning is expensive, causes optimization bailouts), as well as the cost of actually getting the results back into Node-land. This is why SWC abandoned the JS API for writing plugins - constantly bouncing back and forth while traversing AST nodes was even slower than Babel (e.g https://github.com/swc-project/swc/issues/1392#issuecomment-...)
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Building a Minimalist Docker Image with Node, TypeScript
Why Speedy Web Compiler ?
- TypeScript Is Surprisingly OK for Compilers
- Speedy Web Compiler: Rust-Based Platform for the Web
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FTA: Fast TypeScript Analyzer
FTA is a TypeScript static analysis tool built on the speedy foundations of swc. FTA is fast; capable of analyzing more than 150 files per second on typical hardware, it offers a powerful addition to your code quality toolkit.
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Show HN: Ezno, a TypeScript checker written in Rust, is now open source
Very cool! I'm curious, is this intended for dev tooling?
For example, I could see this (or something similar) being useful as the engine for a typescript language server that would be faster than the standard one
But if it's not aimed at 1:1 with tsc, would it be intended more for something like swc[1]?
Or what would you expect people to use this for, besides just being a cool project to learn from?
[1] https://github.com/swc-project/swc
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TypeScript team released an explorer for performance tuning
This is... good news, but I still cannot fathom using the default Typescript compiler for regular development. Seriously, leave the type-checking to your IDE and CICD chain, and switch to using tsx (https://www.npmjs.com/package/tsx) or swc (https://swc.rs/) and you will _immediately_ notice the difference in speed and productivity.
What are some alternatives?
babel-parser
esbuild - An extremely fast bundler for the web
esprima - ECMAScript parsing infrastructure for multipurpose analysis
vite - Next generation frontend tooling. It's fast!
cherow
ts-loader - TypeScript loader for webpack
Rocambole - Recursively walk and transform EcmaScript AST
tsup - The simplest and fastest way to bundle your TypeScript libraries.
jscodeshift - A JavaScript codemod toolkit.
vitest - Next generation testing framework powered by Vite.
Babel (Formerly 6to5) - 🐠 Babel is a compiler for writing next generation JavaScript.
ts-node - TypeScript execution and REPL for node.js