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AI solution for TypeScript puzzle on BFE.dev
18. implement TupleToUnion<T>
type TupleToUnion<T extends any[]> = T[number];Explanation:
Tis a generic parameter that extends an array of any typeT extends any[].T[number]returns a union type of all the elements of the tupleT.
For example, given type Foo as [string, number, boolean], T will be inferred as [string, number, boolean], and T[number] will be "string" | number | boolean, which is the expected union type.