import { GraphQLType } from 'graphql';
import { TypeExpression } from '../type-expression/TypeExpression';
import { Instantiator } from '../types';
import { MetadataStorage } from './MetadataStorage';
export interface ReferenceConfig {
    source: Function | string;
    target: TypeExpression;
}
export declare type ReferenceKind = 'input' | 'output';
export declare abstract class Reference<TConfig extends ReferenceConfig = ReferenceConfig> {
    protected config: TConfig;
    protected abstract kind: ReferenceKind;
    constructor(config: TConfig);
    readonly source: string | Function;
    readonly target: TypeExpression;
    resolveType(storage: MetadataStorage): GraphQLType;
    buildInstantiator(storage: MetadataStorage): Instantiator;
}
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