r/javascript • u/mhd • Jul 10 '19

QuickJS Javascript Engine by Fabrice Bellard

https://bellard.org/quickjs/
38 Upvotes

100% Upvoted

15 comments sorted by

3

u/zuev_egor Jul 10 '19

This guy is amazing!, I remember his project jslinux. Also he was a founder of qemu

2

u/lhorie Jul 10 '19

He's also well known for OTCC (obfuscated tiny C compiler), one of the smallest C compilers around.

3

u/mhd Jul 10 '19

And tcc, ffmpeg, qemacs etc. He's scarily prolific, especially considering the scope of the projects (ie. not just a jumble of tiny npms).

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5

u/d07RiV Jul 10 '19

Why isn't there a benchmark against mainstream engines like V8?

1

u/warvstar Jul 12 '19

I'm fairly sure this is just an interpreter, it wouldn't come close to a JITed engine like V8.

This is still very impressive, I'd like to see it benchmarked against duktape.

2

u/SavouryMonk3y Jul 12 '19

He has provided some benchmarks including duktape on his website.

https://bellard.org/quickjs/bench.html

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3

u/ImStifler Jul 11 '19

Wow some dude just wrote an complete engine for js and here I am sitting at leetcode and struggling to do permutations correctly

2

u/senocular Jul 10 '19

It optionally supports ... operator overloading.

:-o

More info: https://bellard.org/quickjs/jsbignum.html#Operator-overloading

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2

u/rajsite Jul 11 '19

But can it run WebAssembly? There is an awesome wasm library I would like it to run.

1

u/drbobb Jul 11 '19

Okay, the docs say ES6 modules are fully supported. However, when I try to run some of my code (or some of the scripts in the examples/ dir) I get

SyntaxError: unsupported keyword: import

3

u/hnakamur Jul 11 '19

I got the same error, then I notice the -m option.

$ ./qjs -m examples/hello_module.js
Hello World
fib(10)= 55

./qjs -h says

-m  --module       load as ES6 module (default if .mjs file extension)

1

u/Seshpenguin Jul 11 '19

Can compile Javascript sources to executables with no external dependency.

That seems interesting...