问题 I have two angular 9.1.1 project. The first one is to create an angular element and the other one is to use that element. Node: v12.16.2 NPM: 6.14.4 package.json { "name": "angular-element", "version": "0.0.0", "scripts": { "ng": "ng", "start": "ng serve", "build": "ng build", "test": "ng test", "lint": "ng lint", "e2e": "ng e2e", "build:elements": "ng build --prod --output-hashing none && node build-elements.js" }, "private": true, "dependencies": { "@angular/animations": "~9.1.1", "@angular