qjsc usage?

[C-Lunn]

Hi,

How do I use qjsc? I've been an on hours-long rabbit hole trying to improve my Typst compile times -- the Pintora JS extension compiles on every document compile and I feel like I could speed that up by precompiling.

I downloaded qjsc for linux and I get ENOENT and feel like I'm going insane -- even running with strace doesn't help as it doesn't tell me what file I'm missing.
I downloaded qjsc for Windows and the program silently exits with no feedback no matter what arguments I use.

https://bellard.org/quickjs/quickjs.html#qjsc-compiler-1 this documentation tells me that the compiler exists, but not how to use it.

Can someone please guide me? Thanks.

[saghul]

Look at the codegen Makefile target as an example.

The first thing it does is compile the repl JS file to a C file that it's then added to the project so the bytecode can be evaluated.

Is this the use case you have?

[guest271314]

Compiling npm to a standalone executable https://gist.github.com/guest271314/c9543a19d8ccf72881355b27d0107551.

I've been using Bytecode Alliance's Javy (QuickJS engine) to compile JavaScript inside of WASM, then back to asm.js format with wasm2js, and to C with wasm2c. Still trying to figure out how to compile that resulting C to a native executable, due to dependence on wasi_snapshot_preview1.

[guest271314]

@saghul

You can now do this as well: https://quickjs-ng.github.io/quickjs/cli#creating-standalone-executables

This doesn't work

 qjs -c test.js -o app --exe qjs
TypeError: cannot read property 'length' of null
    at compileStandalone (<null>:0:1)

This does work

qjs test.js 9 362879
5 of 23 (0-indexed, factorial 24) => [0,3,2,1]

[saghul]

Can you share test.js ?

[saghul]

Ah wait, I might have messed up error handling in case we can't find the correct executable. Can you try to skip specifying the exe? It will use the current one by default.

[saghul]

Yeah thats it. You need to pass the full path to the exe. I'll fix the error message.