TypeScript: Pick type of item in an Array

arrayElement.ts

/**
 * Get an element from an array
 * @example
 * interface Item {
 *  id: number
 * }
 *
 * interface BunchOfItems extends Array<Item> {}
 *
 * interface SingleItemAgain extends ArrayElement<BunchOfItems> {}
 *
 * // You can use it again as a single item
 * const test: SingleItemAgain = {
 *  id: 123
 * }
 */
type ArrayElement<Type> = Type extends Array<infer Item> ? Item : Type;