Bringing in specific functionalities from rxjs in an Angular 2 component

Question

Bringing in specific functionalities from rxjs in an Angular 2 component

I am currently working on an Angular 2 project that was initialized using the Angular CLI. My main goal is to ensure that the initial load of the project is as fast as possible. To achieve this, I have been focusing on reducing the sizes of all the bundles.

One particular challenge I've encountered is with the rxjs library, as it has significantly increased the size of the bundle. I have been exploring various importing techniques, such as tree shaking, in order to further minimize the chunk size. Although I have tried utilizing suggestions from VSCode for importing, they seem to work during coding but result in errors when building the project using the CLI.

For example, I attempted the following import which did not work:

import { of } from 'rxjs/observable/of';

As a workaround, I had to use:

import { Observable } from 'rxjs/Rx';

Does anyone know of another method to import specific operators successfully?

javascript angular typescript rxjs

Answer 1

Answer №1

If you're working with different versions of RxJs, there are distinct approaches to handling this.

For older versions (< 6), the method involves adding all operators individually like so:

import 'rxjs/add/observable/of'

and then importing Observable from:

import { Observable } from 'rxjs/Observable';

When importing from rxjs/Rx, the entire library is fetched which may cause issues. Furthermore, since the old import method patches the Observable prototype, each operator only needs to be imported once. Typically, operators are grouped into a single file per application and only Observable is imported where needed.

In newer versions of RxJs, particularly version 6.0, imports were restructured for simpler tree shaking. In this case, everything can be imported as follows:

import { Observable } from 'rxjs';
import { map, filter, switchMap } from 'rxjs/operators';

Answer 2

If you're working with different versions of RxJs, there are distinct approaches to handling this.

For older versions (< 6), the method involves adding all operators individually like so:

import 'rxjs/add/observable/of'

and then importing Observable from:

import { Observable } from 'rxjs/Observable';

When importing from rxjs/Rx, the entire library is fetched which may cause issues. Furthermore, since the old import method patches the Observable prototype, each operator only needs to be imported once. Typically, operators are grouped into a single file per application and only Observable is imported where needed.

In newer versions of RxJs, particularly version 6.0, imports were restructured for simpler tree shaking. In this case, everything can be imported as follows:

import { Observable } from 'rxjs';
import { map, filter, switchMap } from 'rxjs/operators';

Bringing in specific functionalities from rxjs in an Angular 2 component

Answer №1

Similar questions

Dealing with dynamic CORS settings in Apache and PHP

An illustration of object destructuring using multiple arguments in rest notation

Is it possible to refresh the browser with a specific URL using Node or Gulp?

Tips for successfully transmitting JSON data from a CFFUNCTION

What is the best way to interact with the DOM through a service in Angular 2?

How to modify values in an array of objects using react js

The integration of Paystack payment is operating smoothly, however, there is a 404 error being returned from the PUT API in

Samsung Phone Experiencing Strange Angular Problem

Having trouble calculating the number of days between two dates at this moment

tips on transforming an array object and generating a fresh array

Modifying state with Vuex mutation and Lodash.remove does not automatically cause a re-render in my Vue component

LibraryManagedAttributes type cannot be assigned to the Type type

The functionality of Jade views is disrupted by external CSS files

The reset function is malfunctioning on the meteor entity

Express server encounters crash due to duplicate registration

Efficient PHP file upload using Ajax

Looking for a solution to split barcode data across two text fields

Encountering issues while retrieving data from a JSON object

Guide to downloading a CSV file directly from a webpage built with vue.js

Unable to back out of side navigation