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

import * as stream from "stream";

type Callback = (err?: Error, records?: any) => void;

export class Generator extends stream.Readable {
    constructor(options?: Options);
    
    readonly options: Options;
}

export interface Options extends stream.ReadableOptions {
    /**
     * Define the number of generated fields and the generation method.
     */
    columns?: number | string[];
    /**
     * Set the field delimiter.
     */
    delimiter?: string;
    /**
     * Period to run in milliseconds.
     */
    duration?: number;
    /**
     * If specified, then buffers will be decoded to strings using the specified encoding.
     */
    encoding?: BufferEncoding | undefined;
    /**
     * When to stop the generation.
     */
    end?: number | Date;
    /**
     * One or multiple characters to print at the end of the file; only apply when objectMode is disabled.
     */
    eof?: boolean | string;
    /**
     * Generate buffers equals length as defined by the `highWaterMark` option.
     */
    fixed_size?: boolean;
    fixedSize?: boolean;
    /**
     * The maximum number of bytes to store in the internal buffer before ceasing to read from the underlying resource.
     */
    high_water_mark?: number;
    highWaterMark?: number;
    /**
     * Number of lines or records to generate.
     */
    length?: number;
    /**
     * Maximum number of characters per word. 
     */
    max_word_length?: number;
    maxWordLength?: number;
    /**
     * Whether this stream should behave as a stream of objects.
     */
    object_mode?: boolean
    objectMode?: boolean;
    /**
     * One or multiple characters used to delimit records.
     */
    row_delimiter?: string;
    /**
     * Generate idempotent random characters if a number provided.
     */
    seed?: boolean | number;
    /**
     * The time to wait between the generation of each records
     */
    sleep?: number;
}

declare function generate(options?: Options, callback?: Callback): Generator;
declare function generate(callback?: Callback): Generator;

// export default generate;
export {generate};