Начало наработок

node_modules/rxjs/interfaces.d.ts

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+import { Observable } from './Observable';
+export declare type UnaryFunction<T, R> = (source: T) => R;
+export declare type OperatorFunction<T, R> = UnaryFunction<Observable<T>, Observable<R>>;
+export declare type FactoryOrValue<T> = T | (() => T);
+export declare type MonoTypeOperatorFunction<T> = OperatorFunction<T, T>;