How to reduce vendor/script bundle.js in Angular 5

Question

I have already used ng build -prod -aot -vc -cc -dop --buildOptimize to reduce the size of the builded app. Now this is my situation:

Is it pos

Answer 1

Sorry For Late Reply. This answer will work for all newer versions of Angular.

1. If you are using Angular Material, Then import from the specific package exporter.

Ex:

import {MatButtonModule} from '@angular/material/button';

istead of

import {MatButtonModule} from '@angular/material';

2. Avoid using Common Material Module throughout your application.

If you are using LazyLoading module, Import required packages in the specific module.

I followed these steps, I got reduced bundle size from 9.0MB to 1.45MB.

Hope it will work for you guys also :).

Answer 2

I had a similar issue with large prod bundles and fixed the issue with this command;

npm run build

I had been using

npm run ng build --prod

but the --prod flag doesn't execute and I was left with a vendor.bundle.js which was 2.9mbs

chunk {inline} inline.bundle.js, inline.bundle.js.map (inline) 3.89 kB [entry] [rendered]
chunk {main} main.bundle.js, main.bundle.js.map (main) 122 kB [initial] [rendered]
chunk {polyfills} polyfills.bundle.js, polyfills.bundle.js.map (polyfills) 349 kB [initial] [rendered]
chunk {styles} styles.bundle.js, styles.bundle.js.map (styles) 16.6 kB [initial] [rendered]
chunk {vendor} vendor.bundle.js, vendor.bundle.js.map (vendor) 2.96 MB [initial] [rendered]

With just npm run build (no ng) the whole dist folder is 400kb

chunk {0} polyfills.67d5a7eec41ba0d20dc4.bundle.js (polyfills) 101 kB [initial] [rendered]
chunk {1} main.3874ea54d23e70290fa8.bundle.js (main) 327 kB [initial] [rendered]
chunk {2} styles.0aad5eda327b47b9e9fa.bundle.css (styles) 1.56 kB [initial] [rendered]
chunk {3} inline.318b50c57b4eba3d437b.bundle.js (inline) 796 bytes [entry] [rendered]

Answer 3

Build your app with sourcemaps, then use a tool like source-map-explorer that details the size of every part of library that you're using.

Some tips with common libraries :

• If you're using RxJS 5.5 or higher, use the .pipe(operator1(), operator2()) syntax, it significantly reduces RxJS size when you don't use many different operators
• If you're using moment.js be sure to import only the locales you're using
• If you're using Angular Material, be sure you don't import unused modules
• If you're using bootstrap and SASS, import only the needed parts of .scss files

If you didn't already do it, divide your app into lazy modules, it will reduce the size of the initial chunk.