export interface Credentials {
    access_token: string;
    refresh_token?: string;
    expires_at?: number;
    token_type: "session" | "oauth";
}
export declare function getToken(): Promise<string | null>;
export declare function getCredentials(): Promise<Credentials | null>;
export declare function setToken(token: string): Promise<void>;
export declare function setCredentials(creds: Credentials): Promise<void>;
export declare function deleteToken(): Promise<void>;
export declare function getTokenSource(): Promise<string | null>;
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