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

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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 However Tether has been replaced by Popper.js for tooltip (and other features).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 console fast enough to advise me of the change to Popper.js:

Bootstrap dropdown require Popper.js

Seems easy enough, I went and updated my webpack.config.js (the entire config can be seen here) and Bootstrap then started working (the only change I did was to replace Tether with Popper):

plugins: [
new ProvidePlugin({
  'Promise': 'bluebird',
  '$': 'jquery',
  'jQuery': 'jquery',
  'window.jQuery': 'jquery',
  'window.$': 'jquery',
  Popper: 'popper.js' 
}),

I also did the import 'bootstrap' in my main.ts file.

However I now have another problem (which I did not have with Tether), a new error is thrown in the console:

Uncaught TypeError: Popper is not a constructor

If I try to debug in Chrome, I do have Popper loaded as an Object (which is why Bootstrap stopped complaining) as you can see in the print screen below. enter image description here

Finally to include all my code. I use Bootstrap tooltip with a simple custom element built with Aurelia and TypeScript (which used to work with previous Bootstrap alpha 6 and Tether)

import {inject, customAttribute} from 'aurelia-framework';
import * as $ from 'jquery';

@customAttribute('bootstrap-tooltip')
@inject(Element)
export class BootstrapTooltip {
  element: HTMLElement;

  constructor(element: HTMLElement) {
    this.element = element;
  }

  bind() {
    $(this.element).tooltip();
  }

  unbind() {
    $(this.element).tooltip('dispose');
  }
}

Looks like I did not import Popper correctly, if so then what is the best way to achieve that with Webpack 3.x?

aurelia bootstrap-4 twitter-bootstrap webpack javascript
5 Answers

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>
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