export type UnitCategory = 'weight' | 'length' | 'temperature' | 'glucose';
export interface UnitDef {
    id: string;
    category: UnitCategory;
    /** Multiplier to the category base unit. */
    factor: number;
    /** Additive offset to the base unit (non-zero only for temperature). */
    offset: number;
}
export declare const UNITS: Record<string, UnitDef>;
export declare const UNITS_BY_CATEGORY: Record<UnitCategory, string[]>;
export declare const CATEGORIES: UnitCategory[];
/**
 * Convert `value` from one unit to another. Both ids must belong to the same
 * category; mismatched categories throw (a programming error, not user input).
 */
export declare function convertUnits(value: number, fromId: string, toId: string): number;
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