import { Readable, Transform, TransformCallback, Writable } from "stream";
type WalkerOptionsType = {
    followSymlinks?: boolean;
    resolveSymlink?: boolean;
    includeDir?: boolean;
    maxDepth?: number;
};
type FinderOptionsType = WalkerOptionsType & {
    filterPattern?: RegExp;
    processor?: (filepath: string) => void;
};
/**
 * NDJSONStream is a Readable stream that emits JSON objects separated by newlines.
 */
export declare class NDJSONStream extends Readable {
    private data;
    private index;
    constructor(data: any[]);
    _read(): void;
}
/**
 * Read a NDJSON stream
 */
export declare class NDJSonReader extends Writable {
    current: string;
    _write(chunk: any, encoding: BufferEncoding, callback: (error?: Error | null) => void): void;
}
/**
 * Gunzip a stream only if it is gzipped
 */
export declare class GunzipConditional extends Transform {
    first: boolean;
    zlib: Transform;
    destination: NodeJS.WritableStream;
    source: any;
    constructor();
    pipe<T extends NodeJS.WritableStream>(destination: T, options?: {
        end?: boolean;
    }): T;
    _transform(chunk: any, encoding: BufferEncoding, callback: TransformCallback): void;
}
/**
 * Type of format managed
 */
type Format = "json" | "yaml";
/**
 * Define a Finder that can be use
 */
export interface StorageFinder {
    /**
     * Recursively browse the path and call processor on each
     */
    walk(path: string, processor: (filepath: string) => void, options?: WalkerOptionsType, depth?: number): void;
    /**
     * Find
     */
    find(currentPath: string, options?: FinderOptionsType): string[];
    /**
     * Get a write stream based on the id return by the finder
     */
    getWriteStream(path: string): Writable;
    /**
     * Get a read stream based on the id return by the finder
     */
    getReadStream(path: string): Readable;
}
/**
 * Allow save/load of yaml or json file
 */
export declare const FileUtils: StorageFinder & {
    save: (object: any, filename: string, publicAudience?: boolean, format?: Format) => void;
    load: (filename: string, format?: Format) => any;
    clean: (...files: string[]) => void;
};
/**
 * Simple JSON utils
 */
export declare const JSONUtils: {
    /**
     * Safe Stringify stringify a object included circular object
     * and also remove any attributes starting with a __
     *
     * @param value
     * @param replacer
     * @param space
     * @returns
     */
    safeStringify: (value: any, replacer?: (key: string, value: any) => any, space?: number | string, publicAudience?: boolean) => string;
    /**
     * See JSON.stringify
     *
     * @param value
     * @param replacer
     * @param space
     * @returns
     */
    stringify: (value: any, replacer?: (key: string, value: any) => any, space?: number | string, publicAudience?: boolean) => string;
    /**
     * Parse a JSON data
     *
     * @param value to parse
     * @returns object parsed
     */
    parse: (value: any) => any;
    /**
     * Duplicate an object using serializer
     */
    duplicate: (value: any) => any;
    /**
     * Visit a json/jsonc file for update
     * @param filename
     */
    updateFile: (filename: string, replacer: (value: any) => any) => Promise<void>;
    /**
     * Helper to FileUtils.save
     */
    loadFile: (filename: string) => any;
    /**
     * Helper to FileUtils.save
     */
    saveFile: (object: any, filename: string, publicAudience?: boolean) => void;
    /**
     * Sort object keys
     * @param unordered
     * @returns
     */
    sortObject: (unordered: any, transformer?: (obj: any) => any) => any;
};
/**
 * Expose basic YAML function
 */
export declare const YAMLUtils: {
    /**
     * Helper to FileUtils.save
     */
    loadFile: (filename: string) => any;
    /**
     * Helper to FileUtils.save
     */
    saveFile: (object: any, filename: string, publicAudience?: boolean) => void;
    /**
     * Duplicate an object using serializer
     */
    duplicate: (value: any) => any;
    /**
     * Parse a single or multiple document yaml
     *
     * @param value to parse
     * @returns object parsed
     */
    parse: (value: any) => any;
    /**
     * YAML helper
     * @param value to serialize
     * @param options as defined by https://eemeli.org/yaml/v1/#yaml-stringify
     * @returns
     */
    stringify: (value: any, options?: any) => string;
};
export {};