import type { LarkAttachment } from '../types.js';
export declare const DASHBOARD_IMAGE_MAX_COUNT = 8;
export declare const DASHBOARD_IMAGE_MAX_BYTES: number;
export declare const DASHBOARD_IMAGE_MAX_TOTAL_BYTES: number;
export interface DashboardImageUpload {
    name: string;
    mimeType: string;
    dataBase64: string;
}
export type DashboardImagesResult = {
    ok: true;
    images: DashboardImageUpload[];
} | {
    ok: false;
    error: string;
};
/** Validate browser-pasted images before any group or session is created.
 * SVG is deliberately excluded: the dashboard only accepts bounded raster
 * formats and verifies the file signature instead of trusting MIME/filename. */
export declare function parseDashboardImageUploads(value: unknown): DashboardImagesResult;
/** Persist validated uploads inside this bot's read-isolation attachment
 * bucket. Each target daemon writes its own copy, so no bot needs access to a
 * sibling appId's files. */
export declare function materializeDashboardImages(larkAppId: string, images: DashboardImageUpload[]): LarkAttachment[];
/** Remove only a materialization directory created by the helper above.
 * Bucket and basename checks keep cleanup scoped to this bot's exact
 * attachment directory even if a malformed path reaches this function. */
export declare function cleanupMaterializedDashboardImages(larkAppId: string, attachments: readonly LarkAttachment[]): void;
//# sourceMappingURL=dashboard-images.d.ts.map