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Because the user needs to be able to test if an error is a
NotFoundError
, ... or whatever.Keep in mind that in JavaScript/TypeScript you cannot really use
instanceof
for that, at least not across packages. There is always a chance that there are multiple versions of the package installed somewhere in the dependency tree and testing an error thrown by stellar-sdk in version A withinstanceof
against a class imported from stellar-sdk version B will returnfalse
even though it is such an error, but instantiated by the other version of the same package.Update: You cannot use
instanceof
, anyway, as the constructors explicitly overwrite the error's prototype.