Empty new project :

tns create aaa --ng ( & webpack & bundle analyzer_)

I wastold by Ben Lesh that in Rxjs6 , weshouldn't do :

import { Observable } from 'rxjs/Observable';

But

import { Observable } from 'rxjs';

Same goes for operators :

import {first, skipWhile}      from "rxjs/operators";

Ok. So at the new project I've added this toapp.component.ts :

import { Component } from "@angular/core";import { timer } from 'rxjs';        <--------@Component({    selector: "ns-app",    templateUrl: "app.component.html",})export class AppComponent {    constructor(){        const source = timer(1000); <--------        source.subscribe(val => console.log(val));    }}

Let's runtns run android --bundle --env.uglify --env.report --env.aot.
(Please noticeuglify)

Let's inspect the bundlewith this site

But look how many operators are in the bundle : -without any explicit reason

* Operator exports *//** PURE_IMPORTS_START  PURE_IMPORTS_END */export { audit } from '../internal/operators/audit';export { auditTime } from '../internal/operators/auditTime';export { buffer } from '../internal/operators/buffer';export { bufferCount } from '../internal/operators/bufferCount';......

Full list is here

Why is it loading the full Rxjs lib even with--uglify ? I know that uglify is not 1:1 tree shaking , but still - it's loading the entire rxjs library.

Also - I was told in the comments :

You need to have path maps configure for your bundler. Otherwise it'll import basically everything like you're mentioning. Seehttps://github.com/ReactiveX/rxjs/blob/master/doc/pipeable-operators.md#build-and-treeshaking

Currently - that path maps section (if it's going to help in any manner) is missing from nativescript supplied webpackjson file.

The final result is that users get the full Rxjs6 library making the bundle size gets a lot bigger.

• Blank project which shows the problem :https://ufile.io/6mdhi
• Ahelpful discussion between myself and Martin about this topic