Sending binary via a typescript websocket client call fails

[rbackhouse]

Golem Version 1.5.1

import { agent, BaseAgent } from "@golemcloud/golem-ts-sdk";

@agent()
class WebSocketTest extends BaseAgent {
    constructor(name: string) {
        super();
    }
    async binary(url: string): Promise<string> {
        return new Promise((resolve, reject) => {
            const ws = new WebSocket(url);
            ws.onopen = () => {
                const buffer = new ArrayBuffer(10);
                const view = new Uint8Array(buffer);
                for (let i = 0; i < view.length; i++) {
                    view[i] = 255;
                }
                ws.send(buffer);
            }
            ws.onmessage = (event) => { ws.close();
                console.log(event);
                resolve("Done"); 
            };
            ws.onerror = (event) => reject(new Error(event.message));
        });
    }
}

golem agent invoke 'WebSocketTest("t1")' 'binary' '"ws://localhost:9090"'

Results in

JavaScript error: Error converting from js 'object' into type 'array'

[2026-05-12T14:02:18.004Z] [INVOKE  ] STARTED  binary (6758a2af-0d62-40fd-8bad-63937f9cbc54)
{"context":"","level":"STDERR","message":"","timestamp":"2026-05-12T14:02:18.010Z"}
{"context":"","level":"STDERR","message":"thread '<unnamed>' (1) panicked at src/internal.rs:188441:","timestamp":"2026-05-12T14:02:18.010Z"}
{"context":"","level":"STDERR","message":"Exception during awaiting call result for guest.invoke:","timestamp":"2026-05-12T14:02:18.010Z"}
{"context":"","level":"STDERR","message":"JavaScript error: Error converting from js 'object' into type 'array'","timestamp":"2026-05-12T14:02:18.010Z"}
{"context":"","level":"STDERR","message":"Stack:","timestamp":"2026-05-12T14:02:18.010Z"}
{"context":"","level":"STDERR","message":"    at <anonymous> (user:125:48)","timestamp":"2026-05-12T14:02:18.010Z"}
{"context":"","level":"STDERR","message":"    at call (native)","timestamp":"2026-05-12T14:02:18.010Z"}
{"context":"","level":"STDERR","message":"    at _dispatch (__wasm_rquickjs_builtin/websocket:365:32)","timestamp":"2026-05-12T14:02:18.010Z"}
{"context":"","level":"STDERR","message":"    at send (__wasm_rquickjs_builtin/websocket:293:72)","timestamp":"2026-05-12T14:02:18.010Z"}
{"context":"","level":"STDERR","message":"    at <anonymous> (user:118:25)","timestamp":"2026-05-12T14:02:18.010Z"}
{"context":"","level":"STDERR","message":"    at call (native)","timestamp":"2026-05-12T14:02:18.010Z"}
{"context":"","level":"STDERR","message":"    at _dispatch (__wasm_rquickjs_builtin/websocket:365:32)","timestamp":"2026-05-12T14:02:18.010Z"}
{"context":"","level":"STDERR","message":"    at <anonymous> (__wasm_rquickjs_builtin/websocket:154:22)","timestamp":"2026-05-12T14:02:18.010Z"}
{"context":"","level":"STDERR","message":"    at apply (native)","timestamp":"2026-05-12T14:02:18.010Z"}
{"context":"","level":"STDERR","message":"    at call (native)","timestamp":"2026-05-12T14:02:18.010Z"}
error: Agent Service - Error: 500 Internal Server Error, Invocation Failed

[RushikeshGandhmal]

I'd love to work on this if it's available. Plan: trace WebSocket send handling for ArrayBuffer and Uint8Array, fix the JS-to-runtime binary conversion path, and add a regression test for binary frames.