Failed to execute 'structuredClone' on prepared vector

[rajsite]

Trying to use the preparePostMessage and rehydrateVector helpers on the README example I get the error message:

Uncaught DOMException: Failed to execute 'structuredClone' on 'Window': (index) => isChunkedValid(unchunkedData, index) could not be cloned.

See stackblitz example: https://stackblitz.com/edit/geoarrow-readme-worker-example?file=src%2Fmain.ts&terminal=dev
And open devtools to see the error.

npm list:

+-- @esbuild/linux-x64@0.19.12 extraneous
+-- @geoarrow/geoarrow-js@0.3.0
+-- @rollup/rollup-linux-x64-gnu@4.12.0 extraneous
+-- @rollup/rollup-linux-x64-musl@4.12.0 extraneous
+-- apache-arrow@15.0.0
+-- typescript@5.3.3
`-- vite@5.1.3

[rajsite]

Looks like the tests only cover Data and not Vector, maybe an issue has been introduced?

It does look like preparePostMessage(Data) and rehydrateData are working but the vector example shown in the README does not seem to.

[kylebarron]

I don't think I ever tested it on Vector, despite implementing preparePostMessage on Vector and rehydrateVector.

Presumably the issue is that a few methods are assigned as attributes with function definitions https://github.com/apache/arrow/blob/6a22a1dee78b0f7daa7e4d8793d663e29a5712a6/js/src/vector.ts#L81-L84

[kylebarron]

I figure that the best solution is to create a new object with only known properties https://github.com/apache/arrow/blob/6a22a1dee78b0f7daa7e4d8793d663e29a5712a6/js/src/vector.ts#L93-L97.

Are you interested in making a PR? It's probably just a couple lines here

geoarrow-js/src/worker/transferable.ts

Line 33 in 75d3576

return [vector, transferArrayBuffers];