const values
I want to be able to validate that a value is one of several specific values and then get a union type returned
e.g.
ow.string.oneOf(["on", "off"] as const)The type would be StringPredicate<"on" | "off"> rather than simply StringPredicate or some subclass of Predicate<T>.
A different solution that might work would be to use ow.any(…) so that union types can be defined for more than just strings:
ow.any(ow.const("on" as const), ow.const("off" as const))
sindresorhus / ow
Function argument validation for humans
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