import { ServerConnection } from '@jupyterlab/services';
/** Terminal session name to the fingerprint of the pty currently behind it. */
export type TerminalFingerprints = Record<string, string>;
/**
 * The live fingerprint of every terminal the server runs, or null when the
 * route did not answer.
 *
 * null and `{}` are different answers and the prune branches on the difference.
 * null is "cannot tell" - an older server, or the server extension disabled -
 * and leaves stored colours to the running-list rule. `{}` is the server
 * stating it runs no terminals, under which every stored terminal colour is
 * stale. Conflating the two either drops every colour on a server without the
 * route, or keeps a recycled name's colour for good.
 *
 * @param serverSettings - connection settings; the default reads the page's
 */
export declare function fetchTerminalFingerprints(serverSettings?: ServerConnection.ISettings): Promise<TerminalFingerprints | null>;