/**
 * validator.ts
 * Input validation and assertion helpers for MajikSignature.
 */
import { ISODateString } from "@majikah/majik-key";
import type { ExpectedSigner, MajikSignatureJSON, MajikSignerPublicKeys, MajikTimestamp, MajikTSAPayload, MultiSigEnvelope } from "./types";
export declare class MajikSignatureValidator {
    static assert(condition: unknown, message: string, field?: string): asserts condition;
    static assertDefined<T>(value: T | undefined | null, field: string): asserts value is T;
    static assertNonEmptyString(value: unknown, field: string): asserts value is string;
    static assertUint8Array(value: unknown, field: string, expectedLen?: number): asserts value is Uint8Array;
    static validateContent(content: Uint8Array | string, field?: string): void;
    static validateContentType(contentType: unknown, field?: string): void;
    static validateSignerPublicKeys(keys: MajikSignerPublicKeys): void;
    static validateEdSecretKey(key: Uint8Array): void;
    static validateMlDsaSecretKey(key: Uint8Array): void;
    static validateJSON(json: unknown): asserts json is MajikSignatureJSON;
    static validateExpectedSigner(entry: unknown, index?: number): asserts entry is ExpectedSigner;
    /**
     * Validate that a seal is structurally complete.
     * All three seal fields must be present together — partial seals are invalid.
     * Does NOT verify the seal hash cryptographically — call verifySeal() for that.
     */
    static validateSeal(env: MultiSigEnvelope): void;
    static validateSealHash(hash: string): void;
    static validateValidUntil(value: ISODateString | undefined): void;
    static validateMultiSigEnvelope(env: unknown): asserts env is MultiSigEnvelope;
    static validateMajikTSAPayload(payload: unknown): asserts payload is MajikTSAPayload;
    static validateMajikTimestamp(tsa: unknown): asserts tsa is MajikTimestamp;
}