Is it possible to map a tuple's generic type to a union type?
type TupleToUnion<T> = T[keyof T]; // This will include all values in the tuple
const value: TupleToUnion<[7, "string"]> = 2; // This assignment should not be permitted since 2 is the length of the tuple
Expected union type: 7 | string
You have the option to use number for indexing instead of keyof T. The keyof T will contain all keys within the tuple object, including its length and any other array properties.
type RequiredUnionType<T extends any[]> = T[number]; // Captures all values of Array properties
const result: RequiredUnionType<[5, boolean]> = 9; // generates error since value can only be 5 or boolean
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