Начало наработок

node_modules/rxjs/operator/do.d.ts

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+import { Observable } from '../Observable';
+import { PartialObserver } from '../Observer';
+export declare function _do<T>(this: Observable<T>, next: (x: T) => void, error?: (e: any) => void, complete?: () => void): Observable<T>;
+export declare function _do<T>(this: Observable<T>, observer: PartialObserver<T>): Observable<T>;