/**
 * @fileoverview In-memory state tracker for the authorized signer set.
 *
 * Maintains the current set of authorized signers, their roles, lifecycle
 * statuses, and metadata. Reconstructed during load() by replaying
 * governance entries from genesis to head.
 *
 * @see Design: AuthorizedSignerSet
 * @see Requirements 12.2-12.8, 14.1-14.7, 15.1-15.5, 17.1-17.9, 18.1-18.8
 */
import { IAuthorizedSigner } from '../interfaces/ledger/authorizedSigner';
import { IBrightTrustPolicy } from '../interfaces/ledger/brightTrustPolicy';
import { IGovernanceAction } from '../interfaces/ledger/governanceAction';
export declare class AuthorizedSignerSet {
    private signers;
    private _brightTrustPolicy;
    private _activeAdminCount;
    constructor(initialSigners: IAuthorizedSigner[], initialQuorum: IBrightTrustPolicy);
    /** Check if a public key is authorized to append (active + admin or writer). */
    canAppend(publicKey: Uint8Array): boolean;
    /** Check if a public key is an active admin. */
    isActiveAdmin(publicKey: Uint8Array): boolean;
    /** Get signer info by public key, or undefined if not found. */
    getSigner(publicKey: Uint8Array): IAuthorizedSigner | undefined;
    /** Get all signers (all statuses). */
    getAllSigners(): IAuthorizedSigner[];
    /** Get current active admin count. */
    get activeAdminCount(): number;
    /** Get current quorum policy. */
    get brightTrustPolicy(): IBrightTrustPolicy;
    /** Compute the required number of signatures for governance. */
    get requiredSignatures(): number;
    /** Validate and apply a governance action. Throws LedgerError on safety violation. */
    applyAction(action: IGovernanceAction): void;
    /** Verify that a set of cosigner public keys satisfies the current quorum. */
    verifyQuorum(signerPublicKeys: Uint8Array[]): boolean;
    /** Clone the current state (for speculative validation). */
    clone(): AuthorizedSignerSet;
    private applyAddSigner;
    private applyRemoveSigner;
    private applyChangeRole;
    private applyUpdateQuorum;
    private applySuspendSigner;
    private applyReactivateSigner;
    private applySetMemberData;
}
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