import type { DiffMethodName, GraphQLSchema, Maybe } from "@graphql-markdown/types";
/**
 * Module for detecting changes in GraphQL schemas.
 * This module provides functionality to compare GraphQL schemas and detect changes.
 *
 * @module diff
 * @category Core
 * @since 1.0.0
 */
/**
 * Determines if there are changes in the GraphQL schema by using a specified diff method and module.
 *
 * @param schema - The GraphQL schema to check for changes.
 * @param tmpDir - The temporary directory to store intermediate files during the diff process.
 * @param diffMethod - The name of the diff method to use. Must be a string or `null`.
 * @param diffModule - The module to import for performing the diff. Defaults to `@graphql-markdown/diff`.
 * @returns A promise that resolves to `true` if changes are detected or if the diff method/module is invalid, otherwise `false`.
 *
 * @example
 * ```typescript
 * import { hasChanges } from "./diff";
 * import { buildSchema } from "graphql";
 *
 * const schema = buildSchema(`
 *   type Query {
 *     hello: String
 *   }
 * `);
 *
 * const changesDetected = await hasChanges(schema, "/tmp", "methodName");
 * console.log(changesDetected); // true or false
 * ```
 *
 * @example Using with a custom diff module
 * ```typescript
 * import { hasChanges } from "./diff";
 *
 * const schema = getMySchema();
 * const result = await hasChanges(
 *   schema,
 *   "/tmp/schema-diff",
 *   "breaking",
 *   "./my-custom-diff-module"
 * );
 * ```
 *
 * @throws Will log a warning if the specified diff module cannot be found.
 * @see {@link DiffMethodName} for available diff methods
 * @see {@link FunctionCheckSchemaChanges} for the signature of the function imported from the diff module
 * @category Schema
 * @since 1.0.0
 */
export declare const hasChanges: (schema: GraphQLSchema, tmpDir: string, diffMethod: Maybe<DiffMethodName>, diffModule?: Maybe<string>) => Promise<boolean>;