How to import popper.js? (not with a CDN, installed with NPM)

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How to import popper.js? (not with a CDN, installed with NPM)
I am aware there is other similar questions such as this one. However mine is quite different.
I would like to know how to import Popper.js using the import
directive. So far I have this on my app.js
(but it does not work yet)
import
app.js
import * as popper from 'popper.js'
window.popper = popper
But I have to mangle every example I find on the Internet with popper.
. Moreover this include takes two lines while the traditional writing window.popper = require('popper.js')
takes only one line.
popper.
window.popper = require('popper.js')
What is the correct way to import Popper.js and other similar JS libraries?
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