So this isn't even a question about web workers, it's a question about how to prop-drill non-string/number data through multiple layers of web-components.
Tbh, I'm not sure there's a way for that. But why not just define a method in your target child component and pass the worker in there?
Tbh, I'm not sure there's a way for that. But why not just define a method in your target child component and pass the worker in there?