declare namespace Ext {
    export namespace promise {
        export interface PromiseConfig {
        }

        export class Promise extends Ext.Base  {
            public static CancellationError?: any;
            public always(onCompleted?: CallableFunction, scope?: object): Ext.promise.Promise;
            public cancel(reason?: Error): void;
            public done(): void;
            public log(identifier?: string): Ext.promise.Promise;
            public otherwise(onRejected?: CallableFunction, scope?: object): Ext.promise.Promise;
            public then(onFulfilled?: CallableFunction, onRejected?: CallableFunction, onProgress?: CallableFunction, scope?: object): Ext.promise.Promise;
        }
    }
}