export declare const GROUP_METADATA_KIND = 40;
export declare const GROUP_INVITE_RUMOR_KIND = 10445;
export declare const GROUP_SENDER_KEY_DISTRIBUTION_KIND = 10446;
export declare const GROUP_SENDER_KEY_MESSAGE_KIND = 10447;
export interface GroupData {
    id: string;
    name: string;
    description?: string;
    picture?: string;
    members: string[];
    admins: string[];
    createdAt: number;
    secret?: string;
    accepted?: boolean;
}
export interface GroupMetadata {
    id: string;
    name: string;
    description?: string;
    picture?: string;
    members: string[];
    admins: string[];
    secret?: string;
}
export declare function isGroupAdmin(group: GroupData, pubkey: string): boolean;
export declare function generateGroupSecret(): string;
/**
 * Build local group state only (pure function).
 *
 * This does not perform any network I/O and does not send metadata to members.
 * Use `GroupManager.createGroup(...)` when you want create + metadata fanout in one step.
 */
export declare function createGroupData(name: string, creatorPubkey: string, memberPubkeys: string[]): GroupData;
export declare function buildGroupMetadataContent(group: GroupData, opts?: {
    excludeSecret?: boolean;
}): string;
export declare function parseGroupMetadata(content: string): GroupMetadata | null;
export declare function validateMetadataUpdate(existing: GroupData, metadata: GroupMetadata, senderPubkey: string, myPubkey: string): "accept" | "reject" | "removed";
export declare function validateMetadataCreation(metadata: GroupMetadata, senderPubkey: string, myPubkey: string): boolean;
export declare function applyMetadataUpdate(existing: GroupData, metadata: GroupMetadata): GroupData;
export declare function addGroupMember(group: GroupData, pubkey: string, actorPubkey: string): GroupData | null;
export declare function removeGroupMember(group: GroupData, pubkey: string, actorPubkey: string): GroupData | null;
export declare function updateGroupData(group: GroupData, updates: {
    name?: string;
    description?: string;
    picture?: string;
}, actorPubkey: string): GroupData | null;
export declare function addGroupAdmin(group: GroupData, pubkey: string, actorPubkey: string): GroupData | null;
export declare function removeGroupAdmin(group: GroupData, pubkey: string, actorPubkey: string): GroupData | null;
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