how to setup bootstrap 4 scss with react webpack - css

Question

i'm starting a new project using reactjs ES6 and webpack
using react-static-boilerplate starter question is how can i import bootstrap4 into the build proccess ?
i dont want to use the bootstrap.css generated file, instead i want webpack to build it for me so i can get to change its #variables and apply my theme etc.
i started project by cloning boilerplate
> git clone -o react-static-boilerplate -b master --single-branch \
https://github.com/kriasoft/react-static-boilerplate.git MyApp
>cd MyApp && npm install
installed bootstrap using npm
npm install bootstrap#4.0.0-alpha.3
now if i required the main bootstrap file into my index.js it will load fine. but how can i include the sass files of bootsrap to start customizing it ?

Answer 1

First of all you need to download proper loader for scss
Install sass-loader
npm install sass-loader --save-dev
Then you need to configure your webpack to test all scss files so it can handle it. Here it is how it is done
{test: /\.scss$/, loaders: [ 'style', 'css', 'sass' ]}
If you got error regarding node-sass
If you got error like cannot resolve node-sass then install
npm i node-sass --save-dev
Now if you import bootstrap.scss webpack will bundle it for you
import "bootstrap/scss/bootstrap.scss"
How to customize it
Example in your own scss file
$btn-font-weight:bold;
and then import the component you want to override or the whole bootstrap.scss
#import '~bootstrap/scss/bootstrap.scss';
In my case style.scss
$btn-font-weight:bold;
#import '~bootstrap/scss/bootstrap.scss';
main.js
import "bootstrap/scss/bootstrap.scss"
import "./style.scss"
Hope this help you to achieve your goal!
I have created a demo app here
run npm install
and npm start
got to localhost:8080

Answer 2

Seems like the boilerplate doesn't use sass-loader, and doesn't look for .scss files.
So first off install npm i sass-loader --save
Then under the loaders part in the webpack config you should add something like this:
webpack.config.js
var path = require('path');
var nodeModules = path.resolve(path.join(__dirname, 'node_modules'));
// this is the entire config object
const config = {
// ...
loaders: [
// ...
{
test: /\.(css|scss)$/,
include: [
path.join(nodeModules, 'bootstrap'),
],
loaders: ["style", "css", "sass"]
}
]
// ...
};
Now, if you want to play around with bootstrap's .scss variables, you can do so like this:
styles/app.scss
$brand-warning: pink !default;
#import '~bootstrap/scss/bootstrap.scss';
and in your main.js put in the style import
import "styles/app.scss";
Also, I should mention, this seems very close to this answer

Answer 3

Now that you're switched to react-slingshot with webpack already set up for sass there's a few less steps. From the raw boilerplate, add bootstrap 4 with npm as you already did:
npm install bootstrap#4.0.0-alpha.3 --save
Then in src/styles/styles.scss you want to add a couple imports
#import "./bootstrap-custom";
#import "~bootstrap/scss/bootstrap";
This is essentially the same thing as #DanielDubovski is showing you but it's a little more conventional to have a separate file of bootstrap overrides, and you don't need default anymore since you're planning on overriding bootstraps defaults and you probably don't want to accidentally override your custom bootstrap colors. To get started with src/styles/bootstrap-custom.scss, you can go into node_modules/bootstrap/scss/_variables.scss and see a complete list of the default variables. You can then copy out the variable names that you want to update. Here's an example of the bootstrap-custom.scss that just overrides the greyscale colors:
/*
* overrides for bootstrap defaults, you can add more here as needed, see node_modules/bootstrap/scss/_variables.scss for a complete list
*/
$gray-dark: #333;
$gray: #777;
$gray-light: #000;
$gray-lighter: #bbb;
$gray-lightest: #ddd;

Answer 4

npm install --save-dev sass-loader css-loader style-loader node-sass
on your webpack.config.js:
loaders: [
{
test: /\.scss$/,
loaders: [ 'style', 'css', 'sass' ]
}
]

Answer 5

Not the OP's original framework (but that was a few years back). As of react-scripts#2.0.0 it now has built in SCSS compiling. So if you're using that for any new projects, it's simple enough to import: https://facebook.github.io/create-react-app/docs/adding-bootstrap