import { Reader } from '../reader';
import { Writer } from '../writer';
export interface Options {
    sync?: boolean;
    chunkSize?: number | (() => number);
}
export declare class StringWriter extends Writer<string> {
    buf: string;
    constructor(options: Options);
    toString(): string;
    get result(): string;
}
export declare function reader(text: string, options?: Options | number): Reader<string>;
export declare function writer(options?: Options): StringWriter;
export declare function factory(url: string): {
    reader: () => any;
    writer: () => any;
};