declare const AUTH_SCHEMES: readonly ["basic", "bearer", "digest", "dpop", "gnap", "hoba", "mutal", "negotiate", "privatetoken", "scram-sha-1", "scram-sha-256", "vapid"];
export type HTTPAuthScheme = (typeof AUTH_SCHEMES)[number];
/**
 * Checks if a string is a valid HTTP authentication scheme.
 * https://www.iana.org/assignments/http-authschemes/http-authschemes.xhtml
 */
export declare function isHTTPAuthScheme(scheme: string): scheme is HTTPAuthScheme;
export {};