import { type ArkmeMessageQuote } from './message-quote.js';
export interface MessageUnderline {
    id: string;
    actorId?: number;
    actorName: string;
    mine: boolean;
    anchor?: ArkmeMessageQuote;
    state: 'available' | 'stale';
    pending?: boolean;
}
export interface MessageUnderlineSnapshot {
    syncNotice?: string;
    revision: number;
    accessible: boolean;
    items: MessageUnderline[];
}
export interface MessageUnderlineCapabilities {
    supported: boolean;
    maxLength: number;
    storage?: 'local' | 'cloud';
    maxBatchSize?: number;
}
export type MessageUnderlineChange = {
    operationId: string;
    kind: 'add';
    anchor: ArkmeMessageQuote;
} | {
    operationId: string;
    kind: 'remove';
    annotationId: string;
};
export declare function underlineId(value: unknown): value is string;
export declare function underlineCapabilities(value: unknown): MessageUnderlineCapabilities;
/** Complete, permission-checked snapshots only. The actor cannot choose whether a mark is mine. */
export declare function readUnderlineSnapshot(value: unknown, viewerId: number): {
    revision: number;
    accessible: boolean;
    items: {
        id: string;
        actorId: number;
        actorName: string;
        mine: boolean;
        anchor: ArkmeMessageQuote;
        state: "available" | "stale";
    }[];
};
/** Newer reads never replace a pending write, and older revisions never resurrect removed marks. */
export declare function acceptUnderlineSnapshot(previous: MessageUnderlineSnapshot | undefined, next: MessageUnderlineSnapshot, pending?: boolean): MessageUnderlineSnapshot | undefined;
/** Team exposes server-determined ownership and public display names, never
 * numeric member identities. Stale marks intentionally contain no old quote. */
export declare function readTeamUnderlineSnapshot(value: unknown): MessageUnderlineSnapshot;
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