How to include Roboto font in webpack build for Material UI?

This is how my team went about including the Roboto fonts in our Webpack project:

Download the Roboto fonts and make a CSS file in a font-specific folder

• Create a folder (/fonts).
• Download all of the Roboto fonts from Font Squirrel. Go to the Webfont Kit tab, then press the Download @font-face Kit button with default settings.
• Move the fonts into /fonts.
• Create the CSS file (/fonts/index.css). We got the contents for this file from this tutorial.

index.css:

* {
  font-family: Roboto, sans-serif;  
}

@font-face {
    font-family: 'Roboto';
    src: url('Roboto-Regular-webfont.eot');
    src: url('Roboto-Regular-webfont.eot?#iefix') format('embedded-opentype'),
         url('Roboto-Regular-webfont.woff') format('woff'),
         url('Roboto-Regular-webfont.ttf') format('truetype'),
         url('Roboto-Regular-webfont.svg#RobotoRegular') format('svg');
    font-weight: normal;
    font-style: normal;
}
 
@font-face {
    font-family: 'Roboto';
    src: url('Roboto-Italic-webfont.eot');
    src: url('Roboto-Italic-webfont.eot?#iefix') format('embedded-opentype'),
         url('Roboto-Italic-webfont.woff') format('woff'),
         url('Roboto-Italic-webfont.ttf') format('truetype'),
         url('Roboto-Italic-webfont.svg#RobotoItalic') format('svg');
    font-weight: normal;
    font-style: italic;
}
 
@font-face {
    font-family: 'Roboto';
    src: url('Roboto-Bold-webfont.eot');
    src: url('Roboto-Bold-webfont.eot?#iefix') format('embedded-opentype'),
         url('Roboto-Bold-webfont.woff') format('woff'),
         url('Roboto-Bold-webfont.ttf') format('truetype'),
         url('Roboto-Bold-webfont.svg#RobotoBold') format('svg');
    font-weight: bold;
    font-style: normal;
}
 
@font-face {
    font-family: 'Roboto';
    src: url('Roboto-BoldItalic-webfont.eot');
    src: url('Roboto-BoldItalic-webfont.eot?#iefix') format('embedded-opentype'),
         url('Roboto-BoldItalic-webfont.woff') format('woff'),
         url('Roboto-BoldItalic-webfont.ttf') format('truetype'),
         url('Roboto-BoldItalic-webfont.svg#RobotoBoldItalic') format('svg');
    font-weight: bold;
    font-style: italic;
}
 
@font-face {
    font-family: 'Roboto';
    src: url('Roboto-Thin-webfont.eot');
    src: url('Roboto-Thin-webfont.eot?#iefix') format('embedded-opentype'),
         url('Roboto-Thin-webfont.woff') format('woff'),
         url('Roboto-Thin-webfont.ttf') format('truetype'),
         url('Roboto-Thin-webfont.svg#RobotoThin') format('svg');
    font-weight: 200;
    font-style: normal;
}
 
@font-face {
    font-family: 'Roboto';
    src: url('Roboto-ThinItalic-webfont.eot');
    src: url('Roboto-ThinItalic-webfont.eot?#iefix') format('embedded-opentype'),
         url('Roboto-ThinItalic-webfont.woff') format('woff'),
         url('Roboto-ThinItalic-webfont.ttf') format('truetype'),
         url('Roboto-ThinItalic-webfont.svg#RobotoThinItalic') format('svg'); (under the Apache Software License). 
    font-weight: 200;
    font-style: italic;
}
 
@font-face {
    font-family: 'Roboto';
    src: url('Roboto-Light-webfont.eot');
    src: url('Roboto-Light-webfont.eot?#iefix') format('embedded-opentype'),
         url('Roboto-Light-webfont.woff') format('woff'),
         url('Roboto-Light-webfont.ttf') format('truetype'),
         url('Roboto-Light-webfont.svg#RobotoLight') format('svg');
    font-weight: 100;
    font-style: normal;
}
 
@font-face {
    font-family: 'Roboto';
    src: url('Roboto-LightItalic-webfont.eot');
    src: url('Roboto-LightItalic-webfont.eot?#iefix') format('embedded-opentype'),
         url('Roboto-LightItalic-webfont.woff') format('woff'),
         url('Roboto-LightItalic-webfont.ttf') format('truetype'),
         url('Roboto-LightItalic-webfont.svg#RobotoLightItalic') format('svg');
    font-weight: 100;
    font-style: italic;
}
 
@font-face {
    font-family: 'Roboto';
    src: url('Roboto-Medium-webfont.eot');
    src: url('Roboto-Medium-webfont.eot?#iefix') format('embedded-opentype'),
         url('Roboto-Medium-webfont.woff') format('woff'),
         url('Roboto-Medium-webfont.ttf') format('truetype'),
         url('Roboto-Medium-webfont.svg#RobotoMedium') format('svg');
    font-weight: 300;
    font-style: normal;
}
 
@font-face {
    font-family: 'Roboto';
    src: url('Roboto-MediumItalic-webfont.eot');
    src: url('Roboto-MediumItalic-webfont.eot?#iefix') format('embedded-opentype'),
         url('Roboto-MediumItalic-webfont.woff') format('woff'),
         url('Roboto-MediumItalic-webfont.ttf') format('truetype'),
         url('Roboto-MediumItalic-webfont.svg#RobotoMediumItalic') format('svg');
    font-weight: 300;
    font-style: italic;
}

Use the file-loader webpack module to load in the font files so webpack can recognize them

• npm install --save file-loader (https://www.npmjs.com/package/file-loader)
• In your webpack config, use the loader like so:

webpack.conf.js:

loaders: [
  ..., {
    test: /\.(woff|woff2|eot|ttf|svg)$/,
    loader: 'file-loader',
    options: { name: '[name].[ext]', outputPath: 'fonts/', }
  },
  ...
]

Import the font css file in the main entry of the app

App.js:

import './fonts/index.css';

And that's it. Your application's default font should now be Roboto.

EDIT: Which Roboto Fonts does Material-UI actually use?

Part of this question is determining the right Roboto fonts to include in the project since the entirety of the Roboto fonts is almost 5MB.

In the README, the instructions for including Roboto point to: fonts.google.com/?selection.family=Roboto:300,400,500. Here, 300 = Roboto-Light, 400 = Roboto-Regular, and 500 = Roboto-Medium. These correspond to the font weights defined in the typography.js file. While these three font weights account for usage in almost the entirety of the library, there is one reference to Regular-Bold in DateDisplay.js. If you are not using the DatePicker, you should probably be safe to omit that. Italics font styling is not used anywhere in the project aside from the GitHub markdown styling.

This information is accurate at the time of this writing, but it may change in the future.

You can also do it like it is documented in this issue: https://github.com/callemall/material-ui/issues/6256

npm install typeface-roboto --save

Then, in your index.js:

import 'typeface-roboto'

Works with webpack/create-react-app.