还需要将 tinymce 的部署文件复制到 assets 文件夹中并添加 tinymce.min.js 的引用

1）在 angular.json 的 "assets" 中添加下面的配置

"assets": [
  "src/assets",
  {
    "glob": "**/*.min.{css,js}",
    "input": "node_modules/tinymce",
    "output": "assets/tinymce7/"
  },
  {
    "glob": "plugins/help/js/**/*.js",
    "input": "node_modules/tinymce",
    "output": "assets/tinymce7/"
  }
]

2）在使用 tinymce 的 component 中注册 TINYMCE_SCRIPT_SRC

Component({
    selector: 'cnb-tinymce7',
    imports: [EditorComponent, SpinnerComponent],
    providers: [
        {
            provide: TINYMCE_SCRIPT_SRC,
            useValue: '/assets/tinymce7/tinymce.min.js'
        }
    ],
    template: `
  <ng-container>
    <cnb-spinner [show]="!tinymceLoaded()">
    <editor licenseKey='gpl'
            [init]="tinymceInit"
            (onInit)="tinymceOnInit()" />
    </cnb-spinner>
</ng-container>
`
})

参考：Using the TinyMCE package with the Angular framework