initiating query from a web worker?

[will-doxel]

I would like to initiate a duckdb-wasm query from a web worker, but I'm running into problems. A simple version of what I'm trying looks like this:

// main.js
// ...usual duckdb setup boilerplate
const duckdb_instance = new duckdb.AsyncDuckDB(logger, worker);
await duckdb_instance.instantiate(bundle.mainModule, bundle.pthreadWorker);

const queryWorker = new Worker('/workers/runQuery.js');
queryWorker.onmessage = (e: MessageEvent) => {
    result = e.data.result;
    console.log('result', result);
    queryWorker.terminate();
}
queryWorker.postMessage({ 
    duckdb_instance 
});

// runQuery.js
onmessage = async (e) => {
    let result = await e.data.duckdb_instance.query(`SLOW QUERY`);

    postMessage({ result });
};

but this fails because the duckdb_instance is not serializable. I have the same problem if I try to pass a AsyncDuckDBConnection. How can I run a query in a web worker?