import { Diagnostics } from './diagnostics.js';
import { GrpcAssertion } from './grpc-assertion.js';
/**
 * Reports gRPC assertions whose source or comparison the backend does not accept.
 *
 * gRPC places no constraint on `property` — any string is valid for every source —
 * so only the source and comparison are checked. Assertions written as plain object
 * literals bypass GrpcAssertionBuilder and are type-legal because the fields are
 * declared as plain strings; the backend rejects an unknown source or comparison
 * with a 400. Source and comparison are independent (the accepted comparison does
 * not depend on the source), so both are always checked.
 */
export declare function validateGrpcAssertion(diagnostics: Diagnostics, assertion: GrpcAssertion, index: number): void;