follow the steps for bootstrap version 4.0.0 beta.3. Most likely, for other versions it will also work.
- Open the Node.js Console
 - Cd The path to your project, where 
package.jsonis - execute command 
npm install popper.js --save - execute command 
npm install bootstrap@4.0.0-beta.3 webpack --config webpack.config.vendor.js - update vendor.js and vendor.css files.- rebuild the project and verify it. If it does not work, run 
Install-Package bootstrap -PreVS Package Manager in the console. 
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