session-desktop/js/modules/loki_file_server_api.d.ts

interface DeviceMappingAnnotation {
  isPrimary: string;
  authorisations: Array<{
    primaryDevicePubKey: string;
    secondaryDevicePubKey: string;
    requestSignature: string; // base64
    grantSignature: string; // base64
  }>;
}

interface LokiFileServerInstance {
  getUserDeviceMapping(pubKey: string): Promise<DeviceMappingAnnotation>;
  clearOurDeviceMappingAnnotations(): Promise<void>;
}