declare module "*.svg" { const content: string; export default content; } declare module "*.png" { const content: string; export default content; } declare module "*.jpg" { const content: string; export default content; } declare const SteamClient: { Apps: { RegisterForAppDetails( appId: number, callback: (details: { strLaunchOptions?: string }) => void ): { unregister: () => void }; SetAppLaunchOptions(appId: number, options: string): void; }; };