import * as ss from "superstruct";
export declare const QueueItemType: ss.Struct<{
    kind: "success";
    code: string;
    state: string;
} | {
    kind: "success_oauth1";
    oauth_token: string;
    oauth_verifier: string;
} | {
    kind: "failure";
    state: string;
}, null>;
export declare const QueueItemArrayType: ss.Struct<({
    kind: "success";
    code: string;
    state: string;
} | {
    kind: "success_oauth1";
    oauth_token: string;
    oauth_verifier: string;
} | {
    kind: "failure";
    state: string;
})[], ss.Struct<{
    kind: "success";
    code: string;
    state: string;
} | {
    kind: "success_oauth1";
    oauth_token: string;
    oauth_verifier: string;
} | {
    kind: "failure";
    state: string;
}, null>>;
export declare type QueueItem = ss.Infer<typeof QueueItemType>;
export declare const POPUP_CONNECT_QUEUE_KEY: string;
export declare function addQueueChangeListener(callback: (item: QueueItem) => void): void;
export declare function removeQueueChangeListener(callback: (item: QueueItem) => void): void;
export declare function enqueueItem(item: QueueItem): void;