Bootstrap depends on [Popper](https://popper.js.org/), which is specified in the `peerDependencies` property. This means that you will have to make sure to add both of them to your `package.json` using `npm install @popperjs/core`.
Import [Bootstrap's JavaScript]({{< docsref "/getting-started/javascript" >}}) in your app's entry point (usually `src/index.js`). You can import all our plugins in one file or separately if you require only a subset of them.
import { Tooltip as Tooltip, Toast as Toast, Popover as Popover } from 'bootstrap';
// Or import just one
import Alert as Alert from '../node_modules/bootstrap/js/dist/alert';
```
## Importing CSS
To utilize the full potential of Bootstrap and customize it to your needs, use the source files as a part of your project's bundling process.
Create your own `scss/custom.scss` to [import Bootstrap's Sass files]({{< docsref "/customize/sass#importing" >}}) and then override the [built-in custom variables]({{< docsref "/customize/sass#variable-defaults" >}}).
## Build app
Include `src/index.js` before the closing `</body>` tag.
