Bootstrap 4: Uncaught ReferenceError: Popper is not defined

Question

I\'ve installed Bootstrap 4 using Node and Gulp and when running the application I get the following error

Uncaught ReferenceError: Popper is not def

Answer 1

For those who are here and trying to add popper v2 to Laravel

1. in package.json at devDependencies section we have "popper.js": "^1.12", so remove this string. As official doc says they move to @popperjs scope name. If you have any v1 poppers used in project follow the migrate guide v1 to v2 from doc. UPD: this sht is required by bootstrap. so, i had to reinstall it after remove. skip this step.
2. in console npm i @popperjs/core
3. in bootstrap.js at try section add window.Popper = require('@popperjs/core')
4. rebuild your js in console npm run dev
5. ok, now you can make your instance let _instance = Popper.createPopper(element, tooltip, {})