/**
 * Checks if a status code is allowed in a close frame.
 *
 * @param {number} code The status code
 * @return {boolean} `true` if the status code is valid, else `false`
 */
export declare function isValidStatusCode(code: number): boolean;
/**
 * Determines whether a value is a `Blob`.
 *
 * @param {*} value The value to be tested
 * @return {boolean} `true` if `value` is a `Blob`, else `false`
 */
export declare function isBlob(value: any): boolean;
export declare const isValidUTF8: (buf: Buffer) => boolean;
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