Update BackendModule interface to allow null or undefined for the cal… #1244
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The current typings require that there is always an
Error
passed in to theBackendModule
callbacks.null | undefined
needs to be added for callbacks with no error.null
because that is what is shown in the docs for creating a custom backend and it's commonly used.undefined
because many projects use linting rules that disallownull
in favor ofundefined
.I don't think there are any tests that need updating based on this change. Please let me know if that is incorrect.