/**
 * Helpers for the closing-template item UOM editor (the Default group pills).
 *
 * `disabledMeasurements` holds the unit ids that are OFF — the base unit id
 * and/or measurement ids; everything not listed is enabled. These helpers are
 * the single source of truth for reading/toggling that state, reused by both
 * the editable Default rows and the read-only named-group chips.
 */
export interface UnitChip {
    id: string;
    label: string;
    isBase: boolean;
    factor: number;
    enabled: boolean;
}
/** Base unit + measurements with their enabled state. */
export declare function templateItemUnits(item: FdoClosingTemplateItem): UnitChip[];
export declare function templateItemEnabledCount(item: FdoClosingTemplateItem): number;
/** Enabled UOM labels (base + measurements), read-only — e.g. ["PC", "BOX ×50"]. */
export declare function templateItemActiveLabels(item: FdoClosingTemplateItem): string[];
/**
 * Toggle a unit on/off. Returns the updated item, or `null` when the change is
 * not allowed (never disable the last enabled unit).
 */
export declare function toggleTemplateItemUnit(item: FdoClosingTemplateItem, chip: UnitChip): FdoClosingTemplateItem | null;