findWithIndex
Source Location: packages/core/src/source.ts#L1652
Signature
function findWithIndex<T, S extends T>( predicate: (value: T, index: number) => value is S, ): Operator< T, { value: S index: number } >
function findWithIndex<T>( predicate: (value: T, index: number) => unknown, ): Operator< T, { value: T index: number } >