import { RequestInit } from "node-fetch";
import { ForeignKeyMetadata, HasuraMetadata, IndexMetadata } from "./interfaces";
export declare class HasuraClient {
    protected url: string;
    protected adminSecret: string;
    constructor(url: string, adminSecret: string);
    fetch(url: string, params: RequestInit): Promise<any>;
    runSql(sql: string): Promise<any>;
    getColumns(tableName: string): Promise<any>;
    getIndexes(tableName: string): Promise<IndexMetadata[]>;
    getEnumValues(tableName: string): Promise<any>;
    getForeignKeys(tableName: string, includedTables: string[]): Promise<ForeignKeyMetadata[]>;
    getMetadata(): Promise<HasuraMetadata>;
}