How to install Bootstrap 5 in Angular

UPDATE A couple things to note with Bootstrap 5:

jQuery is no longer a dependency.
Bootstrap 5 no longer supports Internet Explorer 👍 🥳 🍾.

There are other packages out there that you can use such as ngx-bootstrap, but this is the vanilla Bootstrap (including JavaScript) method.

There are some slight differences from versions before Angular 6. This post is for 6+ and will show you how to install Bootstrap 4 or 5 in Angular using either CSS or SCSS/SASS .

If you're using CSS:

From the root of your project you need to install Bootstrap 5, and Popper.js which is used for dropdown menu’s and other JavaScript sort of things:
```
 npm install bootstrap popper.js --S
```

Update your angular.json file with the same code snippet below in two places: Underneath "build" and "test":

 "styles": [
   "src/styles.css",
   "./node_modules/bootstrap/dist/css/bootstrap.min.css",
 ],
 "scripts": [
   "./node_modules/popper.js/dist/umd/popper.min.js",
   "./node_modules/bootstrap/dist/js/bootstrap.min.js"
 ]

Since we updated angular.json you’ll have to restart your server. Once you do that you should be good to go for the CSS version.

If you're using SCSS or SASS:

From the root of your project you need to install Bootstrap 5, and Popper.js which is used for dropdown menu’s and other JavaScript sort of things:
```
 npm install bootstrap popper.js --S
```

Update your angular.json file with the same code snippet below in two places. Underneath "build" and "test":

 "styles": [
   "src/styles/styles.scss",
   "./node_modules/bootstrap/scss/bootstrap.scss"
 ],
 // See blurb about this below, and delete this comment.
 "stylePreprocessorOptions": {
   "includePaths": [
     "src/styles",
     "./node_modules/bootstrap/scss"
   ]
 },
 "scripts": [
   "./node_modules/popper.js/dist/umd/popper.min.js",
   "./node_modules/bootstrap/dist/js/bootstrap.min.js"
 ]

To read more about stylePreprocessorOptions go to Angular/CLI README . It's a quick (3 min) read and definitely a good thing to be aware of if you're working with SASS, LESS, etc in Angular.

Create a styles directory/folder in /src. So it should be src/styles.

Now move your styles.scss file into that directory and create your variables, mixins and custom files to that src/styles directory using the following naming convention: _variables.scss, _mixins.scss and _custom.scss.

 src
 ├── app
 │   ├── app-routing.module.ts
 │   ├── app.component.html
 │   ├── app.component.scss
 │   ├── app.component.spec.ts
 │   ├── app.component.ts
 │   ├── app.module.ts
 │   └── users
 ├── assets
 ├── environments
 │   ├── environment.prod.ts
 │   └── environment.ts
 ├── favicon.ico
 ├── index.html
 ├── main.ts
 ├── polyfills.ts
 ├── styles
 │   ├── _custom.scss /* Add files here but they should have the "_" pre-pended like `_custom.scss`, (shown above) other than `styles.scss`.  */
 │   ├── _mixins.scss /* Your editor and the lang strips these but I'm not entire sure why they are needed, but that's what I was taught. */
 │   ├── styles.scss
 │   └── _variables.scss  /* Add files here but they should have the "_" pre-pended like `_custom.scss`, (shown above) other than `styles.scss`.  */
 └── test.ts

Now open your styles.scss file and import Bootstrap and your custom/mixin/variable files:

 /* Bootstrap */
 @import 'bootstrap';

 /* Custom */
 @import 'variables';
 @import 'mixins';
 @import 'custom';

To use your variables in other components, you’ll have to import them into every component-name.component.scss file like so. But because we imported all of Bootstrap’s .scss files into our angular.json file, we can leave off the path which makes things much cleaner:
```
 /* component-name.component.scss */
 @import 'variables';
```
Since we updated angular.json you’ll have to restart your server.

Colin Stodd