import { ActivityContext, CtxExpression } from '@tsdi/activities';
import { IPlatformService } from './IPlatformService';
export declare type NodeExpression<T = any> = CtxExpression<T, NodeActivityContext>;
/**
 * pipe activity context.
 *
 * @export
 * @class NodeActivityContext
 * @extends {ActivityContext}
 * @implements {IActivityContext<ITransform>}
 */
export declare class NodeActivityContext extends ActivityContext {
    readonly platform:IPlatformService;
    protected getPlatform(): IPlatformService;
    static ρAnn(): any;
}