Using the fetch API

[jgranduel]

Thanks for this amazing project!

First time I can compile perry on WSL, and after a hello world, I have tried to compile a simple fetch query. It's not yet supported, right, but I can't compile with --enable-js-runtime neither. I took the function getData defined in https://developer.mozilla.org/fr/docs/Web/API/Fetch_API/Using_Fetch as a canonical example.

$ perry compile src/main.ts --enable-js-runtime
Collecting modules...
Found 1 module(s): 1 native, 0 JavaScript
Generating code...

Module init order (0 modules):

Wrote object file: main_ts.o
Linking (runtime-only)...
Using V8 JavaScript runtime for JS module support
/usr/bin/ld: /path/to/perry/perry/target/release/libperry_jsruntime.a(perry_runtime-d9bfb8e27a475660.perry_runtime.596a7181d0bac965-cgu.0.rcgu.o): in function `js_await_any_promise':
perry_runtime.596a7181d0bac965-cgu.0:(.text.js_await_any_promise+0x0): multiple definition of `js_await_any_promise'; /path/to/perry/perry/target/release/libperry_jsruntime.a(perry_jsruntime-2bc0219207bcc988.perry_jsruntime.1c5dee8d130ae367-cgu.0.rcgu.o):perry_jsruntime.1c5dee8d130ae367-cgu.0:(.text.js_await_any_promise+0x0): first defined here
/usr/bin/ld: /path/to/perry/perry/target/release/libperry_jsruntime.a(perry_runtime-d9bfb8e27a475660.perry_runtime.596a7181d0bac965-cgu.0.rcgu.o): in function `js_handle_array_get':
perry_runtime.596a7181d0bac965-cgu.0:(.text.js_handle_array_get+0x0): multiple definition of `js_handle_array_get'; /path/to/perry/perry/target/release/libperry_jsruntime.a(perry_jsruntime-2bc0219207bcc988.perry_jsruntime.1c5dee8d130ae367-cgu.0.rcgu.o):perry_jsruntime.1c5dee8d130ae367-cgu.0:(.text.js_handle_array_get+0x0): first defined here
/usr/bin/ld: /path/to/perry/perry/target/release/libperry_jsruntime.a(perry_runtime-d9bfb8e27a475660.perry_runtime.596a7181d0bac965-cgu.0.rcgu.o): in function `js_handle_array_length':
perry_runtime.596a7181d0bac965-cgu.0:(.text.js_handle_array_length+0x0): multiple definition of `js_handle_array_length'; /path/to/perry/perry/target/release/libperry_jsruntime.a(perry_jsruntime-2bc0219207bcc988.perry_jsruntime.1c5dee8d130ae367-cgu.0.rcgu.o):perry_jsruntime.1c5dee8d130ae367-cgu.0:(.text.js_handle_array_length+0x0): first defined here
collect2: error: ld returned 1 exit status
Error: Linking failed

$ perry doctor 
Perry Doctor

Environment Checks
──────────────────
  ✓ perry version: 0.2.177
  ✓ update status: up to date
  ✓ system linker (cc): cc (Ubuntu 13.3.0-6ubuntu2~24.04.1) 13.3.0
  ✓ runtime library: /path/to/perry/target/release/libperry_runtime.a
  ✓ project config (perry.toml): found

All checks passed!

[proggeramlug]

Thanks for trying Perry on WSL, and for the detailed report!

Two things:

1. You don't need --enable-js-runtime for fetch — Perry compiles fetch natively (it's implemented in Rust under the hood). You should be able to just import and use it directly:

const response = await fetch("https://example.com/api");
const data = await response.json();
console.log(data);

Compile with just perry compile src/main.ts -o output && ./output — no --enable-js-runtime needed.

2. The linker error is a bug on Linux — fixed now. The --enable-js-runtime flag links two static archives (libperry_jsruntime.a and libperry_runtime.a) that share some symbols. macOS handles this silently (first-definition-wins), and we already had the fix for Android (--allow-multiple-definition), but it was missing for Linux. This is fixed in v0.2.178.

Let us know if you hit anything else!

[jgranduel]

Thank you!
I have updated today to version perry 0.2.184 (instead of 0.2.177) , and indeed it has worked at first trial with same code.

Good luck with your project. I really wish it to be known and successful !

[proggeramlug]

Thanks :) Let us know if you need anything else and always happy to support!