export function maxBy<T>( array: readonly T[], selector: (el: T) => number,): T | undefined;export function maxBy<T>( array: readonly T[], selector: (el: T) => string,): T | undefined;export function maxBy<T>( array: readonly T[], selector: (el: T) => bigint,): T | undefined;export function maxBy<T>( array: readonly T[], selector: (el: T) => Date,): T | undefined;export function maxBy<T>( array: readonly T[], selector: | ((el: T) => number) | ((el: T) => string) | ((el: T) => bigint) | ((el: T) => Date),): T | undefined { let max: T | undefined = undefined; let maxValue: ReturnType<typeof selector> | undefined = undefined;
for (const current of array) { const currentValue = selector(current);
if (maxValue === undefined || currentValue > maxValue) { max = current; maxValue = currentValue; } }
return max;}