import type { DomainObjectShape, Refable } from './Refable';
import type { RefByUnique } from './RefByUnique.type';
/**
 * creates a reference to a domain object by its unique key
 *
 * extracts only the unique key properties from a domain object instance
 *
 * note
 * - you may need to explicitly annotate the type for proper inference
 *   - e.g., `const ref = refByUnique<typeof SeaTurtle>(turtle)`
 *   - automatic resolution of the relationship between instance and class.static properties is not yet possible in TypeScript
 * - recursively extracts references from nested domain objects
 *   - if a unique key property is itself a domain object, it will recursively call refByUnique on it
 *
 * @example
 * ```ts
 * const turtle = new SeaTurtle({ uuid: '1', seawaterSecurityNumber: '821', name: 'Crush' });
 * const ref = refByUnique<typeof SeaTurtle>(turtle);
 * // ref = { seawaterSecurityNumber: '821' }
 * ```
 *
 * @example
 * ```ts
 * // with nested domain objects
 * const turtle = new SeaTurtle({ seawaterSecurityNumber: '821', name: 'Crush' });
 * const shell = new SeaTurtleShell({ turtle, algea: 'ALIL' });
 * const ref = refByUnique<typeof SeaTurtleShell>(shell);
 * // ref = { turtle: { seawaterSecurityNumber: '821' } }
 * ```
 */
export declare const refByUnique: <TDobj extends Refable<TShape, TPrimary, TUnique>, TShape extends DomainObjectShape = any, TPrimary extends readonly string[] = any, TUnique extends readonly string[] = any>(instance: InstanceType<TDobj>) => RefByUnique<TDobj, TShape, TPrimary, TUnique>;