Looking for a way to work with a union of tuples:
type TupleUnion = ["a", string] | ["b", number] | [Foo, Bar] // ...
In need of defining a function that can handle any type K extends TupleUnion[0], with the return type being inferred as the second element in the tuple:
function f<K extends TupleUnion[0]>(key: K): ValueFor<K>
How should I define
ValueFor<K extends TupleUnion[0]>In order to filter a specific union member from the TupleUnion where the member is a tuple with a first element K, we can utilize the Extract utility type. Once filtered, we can then retrieve the second element of the extracted tuple.
declare function f<
K extends TupleUnion[0]
>(key: K): Extract<TupleUnion, [K, any]>[1]
Check out this example in the Playground
Update:
To fix the issue mentioned in the comments.
type ValueFor<T, K> = T extends [any, any]
? K extends T[0]
? T[1]
: never
: never
declare function f<K extends TupleUnion[0]>(key: K): ValueFor<TupleUnion, K>;
Take a look at the corrected version on the Playground
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