declare namespace Ext {
    export namespace util {
        export interface FocusableConfig {
            focusCls?: string;
            tabIndex?: number;
        }

        export class Focusable extends Ext.Base  {
            public focusable?: boolean;
            public beforeBlur(e?: Ext.event.Event): void;
            public beforeFocus(e?: Ext.event.Event): void;
            public cancelFocus(): void;
            public focus(selectText?: any, delay?: boolean | number, callback?: CallableFunction, scope?: CallableFunction): Ext.Component;
            public getFocusClsEl(): Ext.dom.Element;
            public getFocusEl(): Ext.dom.Element;
            public getTabIndex(): void;
            public initFocusable(): void;
            public initFocusableEvents(): void;
            public isFocusable(deep?: boolean): boolean;
            public onFocusEnter(e?: object): void;
            public onFocusLeave(e?: Ext.event.Event): void;
            public postBlur(e?: Ext.event.Event): void;
            public postFocus(e?: Ext.event.Event): void;
            public setTabIndex(newTabIndex?: number): void;
        }
    }
}