/**
 * Field Descriptor Builder
 *
 * Constructs a frozen RillFieldDescriptor for a named field within a
 * RillType dict. Used during structural type field access to carry
 * field name and field type.
 *
 * @internal
 */
import type { SourceLocation } from '../../types.js';
import type { RillFieldDef, TypeStructure } from './types/structures.js';
/**
 * Field descriptor — carries field name and structural type when accessing a
 * dict-kind RillType field.
 */
interface RillFieldDescriptor {
    readonly __rill_field_descriptor: true;
    readonly fieldName: string;
    readonly fieldType: RillFieldDef;
}
/**
 * Build a frozen RillFieldDescriptor for the given field in a structural dict type.
 *
 * Throws RILL-R003 when fieldName is absent from structuralType.fields.
 */
export declare function buildFieldDescriptor(structuralType: TypeStructure & {
    kind: 'dict';
}, fieldName: string, location: SourceLocation): RillFieldDescriptor;
export {};