/// <amd-module name="@dataform/api/utils/cancellable_promise" />
export declare class CancellablePromise<T> implements PromiseLike<T> {
    private static readonly CANCEL_EVENT;
    private readonly emitter;
    private readonly promise;
    private cancelled;
    constructor(method: (resolve: (value?: T | PromiseLike<T>) => void, reject: (reason?: any) => void, onCancel?: (handleCancel: () => void) => void) => void);
    then<S>(onfulfilled?: (value: T) => S | PromiseLike<S>, onrejected?: (reason: any) => void): Promise<S>;
    catch(onRejected?: (reason: any) => PromiseLike<never>): Promise<T>;
    cancel(): void;
}