import { CodemirrorModule } from 'ng2-codemirror';
@NgModule({
  // ...
  imports:      [
    CodemirrorModule
  ],
  // ...
})

"styles": [
    "../node_modules/codemirror/lib/codemirror.css",
    "styles.scss"
  ],
  "scripts": [
    "../node_modules/codemirror/lib/codemirror.js"
  ],

<codemirror
  *ngIf="chaptersService.currentChapter"
  [(ngModel)]="chaptersService.currentChapter.novel"
  [config]="{lineNumbers: true}"
  autofocus
  (keyup)="markAsEdited()"
  #textareaNovel>
</codemirror>