export type RequirementLevel = 'auth-token' | 'approval' | 'interaction' | 'clarification' | 'claims';
/** @deprecated Use RequirementLevel instead */
export type RequireLevel = RequirementLevel;
export type Capability = 'interaction' | 'clarification' | 'payment';
export interface AAuthChallenge {
    requirement: RequirementLevel;
    resourceToken?: string;
    url?: string;
    code?: string;
}
export interface AAuthMission {
    approver: string;
    s256: string;
}
/**
 * Build an AAuth-Capabilities request header value.
 * Per the spec, this is an RFC 8941 List of Tokens.
 *
 *   AAuth-Capabilities: interaction, clarification, payment
 */
export declare function buildCapabilitiesHeader(capabilities: Capability[]): string;
/**
 * Parse an AAuth-Capabilities request header value into capability tokens.
 */
export declare function parseCapabilitiesHeader(headerValue: string): Capability[];
/**
 * Build an AAuth-Mission request header value.
 *
 *   AAuth-Mission: approver="https://ps.example"; s256="hash..."
 */
export declare function buildMissionHeader(mission: AAuthMission): string;
/**
 * Parse an AAuth-Mission request header value.
 */
export declare function parseMissionHeader(headerValue: string): AAuthMission;
/**
 * Parse an AAuth-Requirement response header value into a structured challenge.
 *
 * Formats:
 *   AAuth-Requirement: requirement=auth-token; resource-token="..."
 *   AAuth-Requirement: requirement=approval
 *   AAuth-Requirement: requirement=interaction; url="https://..."; code="ABCD1234"
 *   AAuth-Requirement: requirement=clarification
 *   AAuth-Requirement: requirement=claims
 */
export declare function parseAAuthHeader(headerValue: string): AAuthChallenge;
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