Type Alias UnionToTuple<U, T>

UnionToTuple: [U] extends [never]
? T
: UnionToTuple<Exclude<U, Last<U>>, [Last<U>, ...T]>

Convert a union type to a tuple.

Type Parameters

U
Union type
T extends any[] = []
Internal accumulator (used during recursion)

Remarks

Produces a tuple containing all members of the union. The resulting order is not guaranteed and should be treated as arbitrary.

Performance degrades for large unions due to recursive conditional types.

Example

type U = 'a' | 'b' | 'c';
type Tup = UnionToTuple< U >;
// [ 'a', 'b', 'c' ] (order may vary)