/**
 * Validates and normalizes user-facing entity mapping declarations.
 *
 * This module is the construction boundary: callers provide flexible input,
 * and every downstream mapping module receives a validated contract.
 */
import type { TypedSheetsEntityMapping, TypedSheetsEntityMappingInput } from "./contracts.js";
/**
 * Validates and normalizes a single entity-to-Sheets mapping declaration.
 *
 * It rejects ambiguous entity names, duplicated field names, missing business
 * key guarantees, and a projection layout that would violate the v1
 * User_Input/System_State ownership boundary.
 */
export declare function defineTypedSheetsEntityMapping<Entity extends object>(input: TypedSheetsEntityMappingInput<Entity>): TypedSheetsEntityMapping;
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