What is the method for importing specifically the required operators in RxJS 6, resembling the functionality of older RxJS versions, without the need for

In the past, I used to import only specific operators with the following code:

import 'rxjs/Observable';
import 'rxjs/add/operator/map';
import 'rxjs/add/operator/mergeMap';
import 'rxjs/add/operator/catch';
import 'rxjs/add/operator/finally';
import 'rxjs/add/observable/empty';
import 'rxjs/add/observable/throw';

This method resulted in a compact bundle (vendor.ts).
Is there a way to achieve this using RxJS without needing rxjs-compat?
Simply changing the import statement to import 'rxjs'; creates a larger bundle.

UPDATE:

I've attempted all the solutions provided but none seem to work as intended. My revised vendor.ts file looks like this:

import 'rxjs/Observable';
import 'rxjs/Subscription';
import 'rxjs/Subject';
import 'rxjs/observable/throw';
import 'rxjs/operators/map';
import 'rxjs/operators/mergeMap';
import 'rxjs/operators/catchError';
import 'rxjs/operators/finalize';

I also experimented with 'rxjs/add/operator/*'.

This is how I currently import rxjs:

import {Observable} from 'rxjs/Observable';
import {Subscription} from 'rxjs/Subscription';
import {Subject} from 'rxjs/Subject';
import {_throw} from 'rxjs/observable/throw';
import {map} from 'rxjs/operators/map';
import {mergeMap} from 'rxjs/operators/mergeMap';
import {catchError} from 'rxjs/operators/catchError';
import {finalize} from 'rxjs/operators/finalize';   

I adjusted my Webpack 3 configuration based on this guide (https://github.com/ReactiveX/rxjs/blob/master/doc/pipeable-operators.md#build-and-treeshaking) but still encountered issues.

Check out the results of the Webpack Bundle Analyzer here:

https://i.sstatic.net/LNiBD.png

The bundle appears to include all operators. I came across this relevant problem: https://github.com/angular/angular-cli/issues/9069

Answer №1

rxjs-compat should be included in the installation along with rxjs, as it provides support for older import styles.

You can still use RxJS 6 in the same way as RxJS 5:

import 'rxjs/add/operator/map';
import { Observable } from 'rxjs/Observable';

This compatibility layer is expected to be phased out in RxJS 7.

Answer №2

The problem I encountered was due to my setting of module to commonjs in tsconfig.json. It should actually be set to es6, as webpack requires es6 modules for tree shaking to work properly.

To learn more, visit: https://webpack.js.org/guides/tree-shaking/

Tree shaking is a concept commonly used in the JavaScript realm for eliminating dead code. This process depends on the static structure of ES2015 module syntax, specifically import and export statements...

...

  • Utilize ES2015 module syntax (import and export).
  • Ensure that no compilers are converting your ES2015 module syntax into CommonJS modules.

Answer №3

To utilize specific functions, you must import them first.

Avoid using

import from 'rxjs'

Instead, use destructuring like this

import { Observable } from 'rxjs'

Import operators from 'rxjs/operators'

Static functions can be imported from 'rxjs'

For instance, if you need to utilize the 'map' operator, import it as follows:

import { map } 'rxjs/operators';

Then apply it using pipe

observable.pipe(map(() => { some function }))

For a clearer understanding, refer to the Migration Guide or watch an informative video from ng-conf

Answer №4

To achieve your goal, all you require is this snippet of code:

Import { filter, map } from "rxjs/operators"

Feel free to include any other operators that are necessary for your task in this collection.

Import { Observable } from "rxjs" 

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