ckeditor is undefined in Angular 6

问题

I am using ckeditor in Angular 6. And trying to create a instance while uploading image

saveToServer(file: File) {
  this.appService.saveEditorimage(file).subscribe(data => {
   this.response = data.json();
   var url = "/images/" + this.response[0].filename
   console.log(url)
  //  this.ckEditor
  let link = this.ckEditor.instance.document.createElement("img");
  link.setAttribute("alt", "Image");
  link.setAttribute("src", url);
  this.ckEditor.instance.insertElement(link);
  })
  }

this.ckEditor is undefined. How Do i fix this issue.

来源：https://stackoverflow.com/questions/55298230/ckeditor-is-undefined-in-angular-6