Bootstrap4依賴PopperJs在Angular上出現(xiàn)錯(cuò)誤

angular引用bootstrap的依賴popper.js，點(diǎn)擊下拉菜單按鈕不顯示，且報(bào)錯(cuò)

Uncaught TypeError: Bootstrap dropdown require Popper.js (https://popper.js.org)
at Dropdown.toggle (scripts.bundle.js:11898)
at HTMLButtonElement.<anonymous> (scripts.bundle.js:11964)
at HTMLButtonElement.dispatch (scripts.bundle.js:5183)
at HTMLButtonElement.elemData.handle (scripts.bundle.js:4991)
at ZoneDelegate.invokeTask (zone.js:421)
at Zone.runTask (zone.js:188)
at ZoneTask.invokeTask [as invoke] (zone.js:496)
at invokeTask (zone.js:1517)
at HTMLButtonElement.globalZoneAwareCallback (zone.js:1543)

?

?

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

我該如何解決