export interface MentionTrigger {
    start: number;
    end: number;
    query: string;
}
/** Find the active @ token immediately before the caret. The trigger starts at
 * line start or after whitespace; this avoids turning email addresses into bot
 * mentions. Display names may contain spaces once a suggestion has been
 * inserted, but an in-progress query intentionally stops at whitespace. */
export declare function findMentionTrigger(text: string, caret: number): MentionTrigger | null;
export declare function insertBotMention(text: string, trigger: Pick<MentionTrigger, 'start' | 'end'>, botName: string): {
    text: string;
    caret: number;
};
export declare function filterMentionBots<T extends {
    botName: string;
    larkAppId: string;
}>(bots: readonly T[], query: string): T[];
/** Insert visible attachment markers at the textarea selection. Images remain
 * binary attachments, while the markers preserve their intended position in
 * the plain-text task body and make the preview order unambiguous. */
export declare function insertImageMarkers(text: string, selectionStart: number, selectionEnd: number, markers: readonly string[]): {
    text: string;
    caret: number;
};
/** Remove one generated marker without collapsing surrounding words. */
export declare function removeImageMarker(text: string, marker: string): string;
/** Remove one image marker and compact the remaining markers back to attachment
 * order. This keeps `[图片 N]` aligned with the backend's 1-based attachment
 * numbering after deleting an image from the middle of the list. */
export declare function removeAndReindexImageMarkers(text: string, removedMarker: string, remainingMarkers: readonly string[], markerForIndex: (index: number) => string): {
    text: string;
    markers: string[];
};
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