/** @module @twilio-labs/serverless-api/dist/utils */
/// <reference types="node" />
/**
 * Tries to determine the content type of a string or buffer
 *
 * @export
 * @param {(string | Buffer)} content the content to check
 * @returns {Promise<(string | undefined)>} a valid content type or undefined
 */
export declare function getContentType(content: string | Buffer, name?: string): Promise<string | undefined>;