Angular 4 Bootstrap dropdown require Popper.js

Question

I have a fresh created Angular 4 CLI app. After running this:

npm install [email protected] jquery popper.js --save

and editing .angular-cli.json like this:

"styles": [
  "styles.css",
  "../node_modules/bootstrap/dist/css/bootstrap.min.css"
],
"scripts": [
  "../node_modules/jquery/dist/jquery.slim.min.js",
  "../node_modules/bootstrap/dist/js/bootstrap.min.js",
  "../node_modules/popper.js/dist/umd/popper.min.js"
],

I still have an issue in Chrome Console:

Uncaught Error: Bootstrap dropdown require Popper.js (https://popper.js.org)
    at eval (eval at webpackJsonp.../../../../script-loader/addScript.js.module.exports (addScript.js:9), <anonymous>:6:17548)
    at eval (eval at webpackJsonp.../../../../script-loader/addScript.js.module.exports (addScript.js:9), <anonymous>:6:23163)
    at eval (eval at webpackJsonp.../../../../script-loader/addScript.js.module.exports (addScript.js:9), <anonymous>:6:50902)
    at eval (<anonymous>)
    at webpackJsonp.../../../../script-loader/addScript.js.module.exports (addScript.js:9)
    at Object.../../../../script-loader/index.js!../../../../bootstrap/dist/js/bootstrap.min.js (bootstrap.min.js?f885:1)
    at __webpack_require__ (bootstrap a2f1d85ef068872b0530:54)
    at Object.2 (scripts.bundle.js:66)
    at __webpack_require__ (bootstrap a2f1d85ef068872b0530:54)
    at webpackJsonpCallback (bootstrap a2f1d85ef068872b0530:25)

How do I fix this?

Answer 1

Include popper.js before bootstrap.js:

"scripts": [
  "node_modules/jquery/dist/jquery.slim.min.js",
  "node_modules/popper.js/dist/umd/popper.min.js",
  "node_modules/bootstrap/dist/js/bootstrap.min.js"
],