import { GraphQLScalarType } from 'graphql';
import { SchemaDirectiveVisitorClass } from 'graphql-tools';
import type { Schema as JoiSchema } from 'joi';
export declare abstract class JoiConstrainedScalar extends GraphQLScalarType {
    #private;
    constructor(scalarType: GraphQLScalarType, args: any, fieldName: string);
    abstract buildJoi(fieldName: string, args: {
        [key: string]: any;
    }, value: unknown): JoiSchema;
}
export declare function buildJoiDirective(tag: string, scalarType: GraphQLScalarType, ConstrainedScalarType: typeof JoiConstrainedScalar): SchemaDirectiveVisitorClass;