Tracing in JS is broken

[kyzyx]

Using the traceSync and traceAsync functions in JS cause errors:

• When wrapping functions that should return a value, the traced version does not return the value.
• When wrapping functions that should not return a value, the trace is not submitted successfully and an error message is printed.

I used the following test file in a fresh node install

npm init -y
npm install typescript @boundaryml/baml jest ts-jest
npx ts-jest config:init
npx baml-cli init && npx baml-cli generate
npx jest test.ts

// test.ts
import { describe, test, expect } from '@jest/globals';
import { traceSync, traceAsync } from './baml_client/tracing';

function fnWithReturn() : string {
    console.log("fnWithReturn");
    return "Hello, world";
}

function fnWithNoReturn() : void {
    console.log("fnWithNoReturn");
}

async function asyncfnWithReturn() : Promise<string> {
    console.log("asyncfnWithReturn");
    return Promise.resolve("Hello, world");
}

async function asyncfnWithNoReturn() : Promise<void> {
    console.log("asyncfnWithNoReturn");
}


describe('Trace Test', () => {
    test('traceSync with Return', async () => {
        const tracedFnWithReturn = traceSync("tracedFnWithReturn", fnWithReturn);
        const result = tracedFnWithReturn();
        expect(result).toBeDefined();
        expect(result).toBe('Hello, world');
    });
    test('traceSync with no return', async () => {
        const tracedFnWithNoReturn = traceSync("tracedFnWithNoReturn", fnWithNoReturn);
        tracedFnWithNoReturn();
    });
    test('traceAsync with Return', async () => {
        const tracedFnWithReturn = traceAsync("tracedAsyncFnWithReturn", asyncfnWithReturn);
        const result = await tracedFnWithReturn();
        expect(result).toBeDefined();
        expect(result).toBe('Hello, world');
    });
    test('traceAsync with no return', async () => {
        const tracedFnWithNoReturn = traceAsync("tracedAsyncFnWithNoReturn", asyncfnWithNoReturn);
        await tracedFnWithNoReturn();
    });
});

Two tests fail while two other tests appear to pass but print out error messages.