declare type AsyncOrSyncIterable<T> = import("../lib/AsyncOrSyncIterable.js").AsyncOrSyncIterable<T>;
export default function findIndex<T>(iterable: AsyncOrSyncIterable<T>): Promise<number | undefined>;
export default function findIndex<T>(iterable: AsyncOrSyncIterable<T>, predicate: ((value: T, index: number) => any)): Promise<number | undefined>;
export default function findIndex<T, Default = number>(iterable: AsyncOrSyncIterable<T>, defaultValue: Default, predicate: ((value: T, index: number) => any)): Promise<number | Default>;
export {};