/**
 * Partitions attachment formats for the schedule picker when slide deck exports may be disabled.
 *
 * - `available` — formats to offer in the picker (slide formats dropped when disabled).
 * - `visibleSelected` — currently-selected formats to render as chips (offered ones only).
 * - `hiddenSelected` — currently-selected formats that are not offered (e.g. a slide deck the
 *   schedule already had while the feature was enabled). These are kept out of the UI entirely but
 *   must be merged back on save, otherwise an unrelated edit would silently drop them.
 */
export declare function partitionAttachments<T extends string>(all: readonly T[], slideFormats: readonly T[], selected: readonly T[], isSlidesExportEnabled: boolean): {
    available: T[];
    visibleSelected: T[];
    hiddenSelected: T[];
};
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