import type { VerifierOptions } from './config.js';
import { UserspaceError } from './errors.js';
import type { ErrorCode } from './errors.js';
import type { KeyStatus } from './keys.js';
import type { Session, Transport } from './verify.js';
export type { ErrorCode, KeyStatus, Session, Transport, VerifierOptions };
export { UserspaceError };
export declare const SESSION_COOKIE = "__Host-session";
export declare const HINT_COOKIE = "__Host-session-hint";
export type SessionState = 'signed-in' | 'unknown' | 'signed-out';
export type Reason = 'expired' | 'not yet valid' | 'unknown key' | 'wrong token type' | 'issuer mismatch' | 'malformed' | 'no credential' | 'cross-origin';
export type Authentication = {
    ok: true;
    state: 'signed-in';
    session: Session;
} | {
    ok: false;
    preflight: true;
    state: 'signed-out';
} | {
    ok: false;
    preflight?: false;
    state: 'unknown' | 'signed-out';
    status: 401 | 403 | 503;
    reason?: Reason;
    challenge?: string;
    error: UserspaceError;
};
export interface RequestLike {
    method: string;
    url: string;
    headers: Headers;
}
export interface Verifier {
    authenticate(request: RequestLike): Promise<Authentication>;
    unauthorized(refusal: Extract<Authentication, {
        status: number;
    }>): Response;
    verifyToken(token: string): Promise<Session>;
    keyStatus(): KeyStatus;
}
export declare const createVerifier: (options?: VerifierOptions) => Verifier;