export function findLast<T>( items: T[], predicate: (value: T, index: number, obj: T[]) => unknown, thisArg?: any,): T | undefined;export function findLast<T, S extends T>( items: T[], predicate: (this: void, value: T, index: number, obj: T[]) => value is S, thisArg?: any,): T | undefined;export function findLast<T>( items: T[], predicate: (value: T, index: number, obj: T[]) => unknown, thisArg?: any,): T | undefined { const index = items.findLastIndex(predicate, thisArg); const value = items.findLast(predicate, thisArg); if (items[index] !== value) { throw new Error( `The returned value ${value} did not equal the element at index ${index} (${ items[index] }).`, ); } return value;}