/**
 * @oxpulse/chat-widget — Read receipts overlay (#122).
 *
 * Tracks per-user last-read seq and renders checkmarks on own messages.
 * Driven by onReadReceipt SSE events via the SDK subscribe() callback.
 *
 * Zero-third-party-dep — plain DOM, matching the widget's existing pattern.
 *
 * Semantics:
 *   - onReadReceipt({ userId, lastSeq }) → record that `userId` has read
 *     up to `lastSeq`. Multiple users can read the same message.
 *   - A message with seq <= max(lastSeq across all OTHER users) is "read".
 *   - A message with seq <= self's lastReadSeq is "delivered" (server has it).
 *   - Otherwise "sent" (optimistic or in-flight).
 *
 * Display (WhatsApp-style, only on own messages):
 *   - sent:       single checkmark (gray)
 *   - delivered:  double checkmark (gray)
 *   - read:       double checkmark (accent color)
 */
export interface ReadReceiptsOptions {
    /** BCP-47 tag or resolved Locale. */
    lang?: string;
    /** The current user's ID — own read receipts are not counted. */
    selfUid: string;
    /** Optional AbortSignal — destroy() is called automatically on abort. */
    signal?: AbortSignal;
}
export declare class ReadReceipts {
    #private;
    constructor(opts: ReadReceiptsOptions);
    /** Record that a user has read up to lastSeq. Self is ignored. */
    onReadReceipt(userId: string, lastSeq: number): void;
    /** Register a bubble element for receipt updates. Only for own messages. */
    registerBubble(msgId: string, seq: number, el: HTMLElement): void;
    /** Unregister a bubble (e.g. on eviction). */
    unregisterBubble(msgId: string): void;
    /** Get the max read seq across all other users. */
    get maxReadSeq(): number;
    /** Clear all read state (e.g. on room switch). */
    clearAll(): void;
    destroy(): void;
}
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