import { setTimeout as setNativeTimeout } from "node:timers";
export type OAuthCallbackResult = {
    code: string;
    state: string;
};
export type CallbackServer = {
    port: number;
    waitForCallback: () => Promise<OAuthCallbackResult>;
    close: () => Promise<void>;
};
export type CallbackServerTimerHandle = ReturnType<typeof setNativeTimeout>;
export type CallbackServerTimer = {
    readonly setTimeout: (callback: () => void, delayMs: number) => CallbackServerTimerHandle;
    readonly clearTimeout: (handle: CallbackServerTimerHandle) => void;
};
export declare function findAvailablePort(startPort?: number): Promise<number>;
export declare function startCallbackServer(startPort?: number, options?: {
    readonly timer?: CallbackServerTimer;
}): Promise<CallbackServer>;