import { ValueGenerator } from './value-generator';
/**
 * The class makes it easy to generate random strings.
 * Strings generated by this class are UUIDs.
 * @implements {ValueGenerator}
 */
export declare class StringGenerator implements ValueGenerator<string> {
    private readonly _prefix;
    /**
     * Create a new `StringGenerator`
     * @param prefix - prefix for all generated strings (optional)
     */
    constructor(prefix?: string);
    /**
     * Create string with random value
     * @returns `string`
     */
    generate(): string;
}