Attention:
I just realized the difference between installations with npm install and yarn .
Here are the two commands I used:
yarn add bootstrap@4.0.0-alpha.6 --dev npm install bootstrap@4.0.0-alpha.6 --save-dev
The correct / current version of bootstrap 4.0.0-alpha.6 contains this file:
/node_modules/bootstrap/scss/_tags.scss
Installed with npm, this file exists as expected. But installed through yarn, this file is missing. Even if changing bootstrap@ ^4.0.0-alpha.6 to bootstrap@4.0.0-alpha.6 in package.json did not fix this problem.
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