import type { CliInvocation } from "../../cli-bin";
import type { DeployTargetOptions } from "../../types";
/** Spawn env for Vercel CLI: process env wins, then `.env` / `.env.local`. */
export declare function vercelCliEnv(projectDir: string): NodeJS.ProcessEnv;
/** True when `.vercel/project.json` exists in the project. */
export declare function isVercelLinked(projectDir: string): boolean;
/**
 * Vercel project names are lowercase alphanumeric + hyphens, max 100 chars.
 * Prefer `package.json` `name` over the folder.
 */
export declare function toVercelProjectName(projectDir: string): string;
/** Ensure the Vercel CLI is runnable, installing via dlx when needed. */
export declare function prepareVercelCli(invocation: CliInvocation, cwd: string): Promise<void>;
/** Probe login with a non-interactive `vercel whoami`. */
export declare function isVercelLoggedIn(invocation: CliInvocation, cwd: string): Promise<boolean>;
/** Run interactive `vercel login`, or fail if there is no TTY. */
export declare function loginToVercel(invocation: CliInvocation, opts: Pick<DeployTargetOptions, "projectDir" | "noInteractive">): Promise<void>;
/** Link the directory to a Vercel project (`vercel link`, `--yes` when skipping prompts). */
export declare function linkVercelProject(invocation: CliInvocation, opts: Pick<DeployTargetOptions, "projectDir" | "yes" | "noInteractive" | "extraArgs">): Promise<void>;
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