/// <reference types="node" />

declare module "klaw" {
    import * as fs from "fs";
    import { Readable, ReadableOptions } from "stream";

    // forward-compatible iterator type for TS <5.6
    global {
        // eslint-disable-next-line @typescript-eslint/no-empty-interface
        interface AsyncIteratorObject<T, TReturn, TNext> {}
    }
    interface StreamIterator<T> extends AsyncIterator<T, any, any>, AsyncIteratorObject<T, any, any> {
        [Symbol.asyncIterator](): StreamIterator<T>;
    }

    function K(root: string, options?: K.Options): K.Walker;

    namespace K {
        interface Item {
            path: string;
            stats: fs.Stats;
        }

        type QueueMethod = "shift" | "pop";

        interface Options extends ReadableOptions {
            queueMethod?: QueueMethod | undefined;
            pathSorter?: ((pathA: string, pathB: string) => number) | undefined;
            fs?: any; // fs or mock-fs
            filter?: ((path: string) => boolean) | undefined;
            depthLimit?: number | undefined;
            preserveSymlinks?: boolean | undefined;
        }

        type Event = "close" | "data" | "end" | "error" | "pause" | "readable" | "resume";

        interface Walker extends Readable, AsyncIterable<Item> {
            on(event: Event, listener: Function): this;
            on(event: "close", listener: () => void): this;
            on(event: "data", listener: (item: Item) => void): this;
            on(event: "end", listener: () => void): this;
            on(event: "readable", listener: () => void): this;
            on(event: "error", listener: (err: Error) => void): this;
            read(): Item;
            [Symbol.asyncIterator](): StreamIterator<Item>;
        }
    }

    export = K;
}