Importing a member into a nested name may be achievable

Although I've been utilizing rxjs with Typescript by importing it as follows:

import * as rx from 'rxjs/Rx';

var stream: rx.Subject<boolean> = new rx.Subject<boolean>();

While this approach works, I am now interested in implementing tree-shaking and it seems that "patching" imports [1] is the way to achieve this. Therefore, I could modify my import statement like so:

import {Subject} from 'rxjs/Subject';
var stream: Subject<boolean> = new Subject<boolean>();

This solution is satisfactory, but I wish to maintain the symbol names within rxjs under a shared prefix (e.g., rx.Subject). However, based on how the ES6 import statement functions, there doesn't appear to be an obvious way of accomplishing this [2]. Ideally, I would prefer something similar to:

import {Subject} as rx from 'rxjs/Subject';

or any other syntax that enables me to achieve the same outcome.

Is there a specific syntax or conventional method for achieving this?

1: http://reactivex.io/rxjs/manual/installation.html 2: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/import

Answer №1

If you want to streamline your code and only import the symbols you need from rx, you can create a module specifically for that purpose. Let's call it rx-subset.ts:

export {Subject} from 'rxjs/Subject';

// and so forth

By doing this, you can now use this subset module in place of importing the entire rx library throughout your source code like so:

import * as rx from './rx-subset'

// now you can access rx.Subject without any issues

Answer №2

There are two possible approaches you could take. Here they are:

import { Sub as rx.Subj } from "rxjs/Subj";
let subj = new rx.Subj();

or

import * as rx from "rxjs/Subj";
let subj = new rx.Subj();

Either of these strategies should be effective.

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