There is no easy way to do it. Wish yarn/npm had an --allow-scripts flag. Anyway, this is what you could do. Find out which packages require postinstall script

There is no easy way to do it. Wish yarn/npm had an --allow-scripts flag. Anyway, this is what you could do. Find out which packages require postinstall scripts and then run it manually: $ grep postinstall node_modules/**/package.json node_modules/node-sass/package.json: "postinstall": "node scripts/build.js", $ cd node_modules/node-sass/ $ yarn run postinstall On the positive side, you get to know more about the dependency that you are trying to add :)