Update to popper.js v2.x

build/rollup.config.js

@@ -3,13 +3,14 @@
 const path = require('path')
 const { babel } = require('@rollup/plugin-babel')
 const { nodeResolve } = require('@rollup/plugin-node-resolve')
+const replace = require('@rollup/plugin-replace')
 const banner = require('./banner.js')
 
 const BUNDLE = process.env.BUNDLE === 'true'
 const ESM = process.env.ESM === 'true'
 
 let fileDest = `bootstrap${ESM ? '.esm' : ''}`
-const external = ['popper.js']
+const external = ['@popperjs/core']
 const plugins = [
   babel({
     // Only transpile our source code
@@ -19,15 +20,15 @@ const plugins = [
   })
 ]
 const globals = {
-  'popper.js': 'Popper'
+  '@popperjs/core': 'Popper'
 }
 
 if (BUNDLE) {
   fileDest += '.bundle'
   // Remove last entry in external array to bundle Popper
   external.pop()
-  delete globals['popper.js']
-  plugins.push(nodeResolve())
+  delete globals['@popperjs/core']
+  plugins.push(replace({ 'process.env.NODE_ENV': '"production"' }), nodeResolve())
 }
 
 const rollupConfig = {