If present, indicates the operation failed.
If present and err is not present, the return value from the operation.
Defines an event used in through operations.
The payload of the event.
This returns a function that you call to create an instance of the RStreams SDK.
The SDK is usually smart enough to find the config it needs or you can pass it in directly here.
The SDK instance itself.
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A standard callback function. If the operation failed, return the first argument only, often a string or an Error object. If the operation succeeded and nothing needs to be returned from the callback, pass no arguments. If the operation succeeded and something needs to be returned through the callback, pass null as the first argument and the return object as the second argument.