/** Current version of the serialization format for `SerializedUnitSchema`.
 *
 * This value is written into `Units.json` as the `version` field and checked at
 * parse time. Two version axes exist:
 *
 * - **Format version** (`SERIALIZED_UNIT_SCHEMA_VERSION` / `Units.json.version`): bump
 *   the major version when the shape of the `SerializedUnitSchema` interfaces changes
 *   incompatibly (e.g. renaming fields, removing required properties). Minor bumps for
 *   backward-compatible additions.
 *
 * - **Source provenance** (`sourceEcSchemaVersion` inside `Units.json`): records which
 *   version of the BIS Units EC schema the data was derived from (e.g. `"01.00.09"`).
 *   This is a traceability marker, not a runtime contract.
 *
 * @internal
 */
export declare const SERIALIZED_UNIT_SCHEMA_VERSION = "01.00.00";
/** A serialized constant definition (e.g. `PI`, `MILLI`).
 * @internal
 */
export interface SerializedConstant {
    readonly schemaItemType: "Constant";
    readonly label?: string;
    readonly description?: string;
    /** The phenomenon this constant belongs to. */
    readonly phenomenon: string;
    /** The unit definition expression (e.g. `"M*M"`). */
    readonly definition: string;
    /** Numerator of the conversion factor to the SI base. */
    readonly numerator?: number;
    /** Denominator of the conversion factor to the SI base. */
    readonly denominator?: number;
}
/** A serialized unit definition (e.g. `M`, `FT`, `CELSIUS`).
 * @internal
 */
export interface SerializedUnit {
    readonly schemaItemType: "Unit";
    readonly label?: string;
    readonly description?: string;
    readonly phenomenon: string;
    readonly unitSystem: string;
    /** The unit definition expression (e.g. `"M*M"`). */
    readonly definition: string;
    /** Numerator of the conversion factor to the SI base. */
    readonly numerator?: number;
    /** Denominator of the conversion factor to the SI base. */
    readonly denominator?: number;
    /** Additive offset for the conversion (e.g. temperature scales). */
    readonly offset?: number;
}
/** A serialized inverted unit definition (e.g. `HORIZONTAL_PER_VERTICAL`).
 * @internal
 */
export interface SerializedInvertedUnit {
    readonly schemaItemType: "InvertedUnit";
    readonly label?: string;
    readonly description?: string;
    readonly invertsUnit: string;
    readonly unitSystem: string;
}
/** A serialized unit system definition (e.g. `SI`, `METRIC`).
 * @internal
 */
export interface SerializedUnitSystem {
    readonly schemaItemType: "UnitSystem";
    readonly label?: string;
    readonly description?: string;
}
/** A serialized phenomenon definition (e.g. `LENGTH`, `TEMPERATURE`).
 * @internal
 */
export interface SerializedPhenomenon {
    readonly schemaItemType: "Phenomenon";
    readonly label?: string;
    readonly description?: string;
    /** The phenomenon definition expression. */
    readonly definition: string;
}
/** Discriminated union of all serialized schema item types.
 * @internal
 */
export type SerializedUnitItem = SerializedConstant | SerializedUnit | SerializedInvertedUnit | SerializedUnitSystem | SerializedPhenomenon;
/** Versioned container for a serialized BIS unit schema. The `items` map is keyed by schema-item name (unqualified).
 * @internal
 */
export interface SerializedUnitSchema {
    /** Serialization format version, matching `SERIALIZED_UNIT_SCHEMA_VERSION` (e.g. `"01.00.00"`). */
    readonly version: string;
    readonly name: string;
    readonly alias: string;
    /** EC schema version of the source BIS Units schema this data was derived from (e.g. `"01.00.09"`). */
    readonly sourceEcSchemaVersion: string;
    readonly items: {
        readonly [name: string]: SerializedUnitItem;
    };
}
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