declare namespace Ext {
    export namespace drag {
        export namespace proxy {
            export interface PlaceholderConfig {
                cls?: string;
                cursorOffset?: number[];
                html?: string;
                invalidCls?: string;
                validCls?: string;
            }

            export class Placeholder extends Ext.drag.proxy.None  {
                public getCls(): void;
                public getCursorOffset(): void;
                public getHtml(): void;
                public getInvalidCls(): void;
                public getValidCls(): void;
                public setCls(): void;
                public setCursorOffset(): void;
                public setHtml(): void;
                public setInvalidCls(): void;
                public setValidCls(): void;
            }
        }
    }
}