Within the type definitions for Bluebird promises, there is a catch function that has the following definition:
catch<U = R>(onReject: ((error: any) => Resolvable<U>) | undefined | null): Bluebird<U | R>;
The symbol "R" is derived from the Bluebird class declaration itself, while "U" serves as the initial type parameter across all of Bluebird's functions.
What exactly does <U = R> signify in this context?
The generic parameter has a default value assigned to it.
Interestingly, this default value is not mentioned in the official documentation, so we can only refer to the github issue for more information.
References:
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