/**
 * @param size -
 * @param base -
 * @internal
 */
export declare function createRandomToken(size: number, base?: number): string;
/**
 * @internal
 */
export declare function getReasonPhrase(code: number): string;
/**
 * @internal
 */
export declare function newTag(): string;
/**
 * @param str -
 * @internal
 */
export declare function headerize(str: string): string;
/**
 * @param str -
 * @internal
 */
export declare function str_utf8_length(str: string): number;
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