declare namespace Ext {
    export namespace env {
        export interface BrowserConfig {
        }

        export class Browser   {
            public engineName?: string;
            public engineVersion?: Ext.Version;
            public isSecure?: boolean;
            public name?: string;
            public userAgent?: string;
            public version?: Ext.Version;
            public is(name?: string): boolean;
        }
    }
}