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Error handling

Exceptions

An exception thrown by an RPC method implementation will propagate to the caller. If it is one of the standard JavaScript Error types, the message and prototype's name will be retained, though the stack trace is not.

Unsupported error types

If an AggregateError ↗ is thrown by an RPC method, it is not propagated back to the caller.
The SuppressedError ↗ type from the Explicit Resource Management proposal is not currently implemented or supported in Workers.
Own properties of error objects, such as the cause ↗ property, are not propagated back to the caller

Additional properties

For some remote exceptions, the runtime may set properties on the propagated exception to provide more information about the error; see Durable Object error handling for more details.