import { IterableX } from '../../iterable/iterablex' ; import { findIndex } from '../../iterable/findindex' ; import { FindOptions } from '../../iterable/findoptions' ; ignore export function findIndexProto < T > ( this , options ) { return findIndex ( this , options ) ; } IterableX . prototype . findIndex = findIndexProto ; declare module '../../iterable/iterablex' { interface IterableX < T > { findIndex : typeof findIndexProto ; } }