import { type InstanceGithub } from "../../../../../utils/instanceGithub.js";
/**
 * Checks whether there is an existing deployment for the given project.
 *
 * It validates that the GitHub token exists in memory and that a GitHub
 * username is provided, then uses Octokit to list deployments.
 *
 * @param projectName - The name of the project/repository.
 * @param githubUsername - The GitHub username (owner).
 * @param githubToken - The GitHub token.
 *
 * @returns True if at least one deployment is found; false otherwise.
 */
export declare function checkVercelDeployment(projectName: string, githubUsername: string, githubToken: string, githubInstance: InstanceGithub): Promise<boolean>;