Bootstrap 4 Beta importing Popper.js with Webpack 3.x throws Popper is not a constructor

Question

So Bootstrap 4 Beta is out... yey! However Tether has been replaced by Popper.js for tooltip (and other features). I saw an error thrown in the con

Answer 1

While browsing Bootstrap 4 documentation. I actually found a section about Webpack which explains how to install it correctly. Following the Bootstrap - installing with Webpack documentation, the answer is to simply modify the webpack.config.js with the following:

plugins: [
  // ...
  new webpack.ProvidePlugin({
    $: 'jquery',
    jQuery: 'jquery',
    'window.jQuery': 'jquery',
    Popper: ['popper.js', 'default']
  })
  // ...
]

and let's not forget to import it in the main.ts

import 'bootstrap';

and voilà! We are back in business :)

Answer 2

In ASP.net Core 2 project add the following scripts to of main HTML file ("_Layout.cshtml" file)

<script src="~/lib/jquery/dist/jquery.min.js"></script>
<script src="~/js/popper.js"></script>
<script src="~/lib/bootstrap/dist/js/bootstrap.min.js"></script>

For me it's working.

Answer 3

In bootstrap": "^4.1.1" no need to import jquery and popper.js because those plugins will be already included when 'bootstrap' or bootstrap's plugins imported individually.

Notice that if you chose to import plugins individually, you must also install exports-loader

No need to require files require('exports-loader?file ... '); as mentioned here because this will be taken care automatically by just installing $ npm install exports-loader --save-dev

import 'bootstrap'; // Import all plugins at once

//
// Or, import plugins individually
//
// import 'bootstrap/js/src/alert';
// import 'bootstrap/js/src/button';
// import 'bootstrap/js/src/carousel';
// import 'bootstrap/js/src/collapse';
// import 'bootstrap/js/src/dropdown';
// import 'bootstrap/js/src/modal';
// import 'bootstrap/js/src/popover';
// import 'bootstrap/js/src/scrollspy';
// import 'bootstrap/js/src/tab';
// import 'bootstrap/js/src/tooltip';
// import 'bootstrap/js/src/util';

There is no need to do anything like below:

const webpack = require('webpack');

module.exports = {
  configureWebpack: {
    plugins: [
      new webpack.ProvidePlugin({
        $: 'jquery',
        jQuery: 'jquery',
        'window.jQuery': 'jquery',
        Popper: ['popper.js', 'default']
      })
    ]
  }
}

I am a vue.js developer and in new vue-cli-3, we create vue.config.js in root and place code like above to register new plugin, but as said there is no need to do all this in bootstrap": "^4.1.1".

Bootstrap's tooltip plugin is depend on popper.js and need to be enabled manually, so you can do like below in the component where you use tooltip element:

<script>
  import $ from 'jquery';

  export default {
    mounted() {
      $('[data-toggle="tooltip"]').tooltip();
    },
  };
</script>

Answer 4

If you are using Webpack Do this:

window.$ = window.jQuery = require('jquery');
window.Popper = require('popper.js').default; // pay attention to "default"
require('bootstrap/dist/js/bootstrap');

Answer 5

I just ran into the same issue, and the solution is described here: https://github.com/FezVrasta/popper.js/issues/287

My main.ts now looks like something like the following:

import "jquery";
import Popper from "popper.js";

(<any>window).Popper = Popper;

require("bootstrap");

And I had to run npm install @types/requirejs --save to get the call to require working.

EDIT: I totally missed this the first time around, but the documention actually has a better way to solve this https://getbootstrap.com/docs/4.0/getting-started/webpack/

plugins: [
  ...
  new webpack.ProvidePlugin({
    $: 'jquery',
    jQuery: 'jquery',
    'window.jQuery': 'jquery',
    Popper: ['popper.js', 'default'],
    // In case you imported plugins individually, you must also require them here:
    Util: "exports-loader?Util!bootstrap/js/dist/util",
    Dropdown: "exports-loader?Dropdown!bootstrap/js/dist/dropdown",
    ...
  })
  ...
]