interface OpenIdTokenProviderConfig {
    matrixAccessToken: string;
    homeServerUrl: string;
    matrixUserId?: string;
}
export type GetOpenIdToken = () => Promise<string>;
export declare class OpenIdTokenProvider {
    private cached;
    private mutex;
    private readonly matrixAccessToken;
    private readonly homeServerUrl;
    private matrixUserId?;
    private static readonly EXPIRY_BUFFER_MS;
    constructor(config: OpenIdTokenProviderConfig);
    private withMutex;
    private fetchWithRetry;
    getToken(): Promise<string>;
}
export declare function createOpenIdTokenProvider(config: OpenIdTokenProviderConfig): GetOpenIdToken;
export {};
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