/**
 * ngrok tunnel management for making local services reachable from remote workspaces.
 *
 * Used by `sudopod headscale start` to expose local Headscale to Coder workspaces on AWS.
 * Spawns ngrok as a detached process so it survives after the CLI command exits.
 */
export interface NgrokTunnelResult {
    /** Public HTTPS URL, e.g. "https://abc123.ngrok-free.app" */
    url: string;
    /** PID of the ngrok process (for cleanup via stopNgrokTunnel) */
    pid: number;
}
/**
 * Start an ngrok tunnel to the given local port.
 *
 * Spawns ngrok as a **detached** process so it survives after the CLI exits.
 * Polls the ngrok local API for the public HTTPS URL.
 *
 * Requires `ngrok` CLI installed and authenticated:
 *   ngrok config add-authtoken <token>
 */
export declare function startNgrokTunnel(port: number, timeoutMs?: number): Promise<NgrokTunnelResult>;
/**
 * Stop an ngrok tunnel by killing its process.
 */
export declare function stopNgrokTunnel(pid: number): void;
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