[Question]: Making grapesjs working with angular7 and material

I'm trying to integrate the library with Angular7, but got problem when moving container <div id="gjs"></div>into the material component (stepper) in this case.

I put my code in https://stackblitz.com/edit/angular-qa6gqz (error with grapesjs doesn't happen in my local environment).

<mat-horizontal-stepper labelPosition="bottom" [@.disabled]="true">
    <mat-step label="Template management" [completed]="false">
      TEMPLATES
    </mat-step>
    <mat-step label="Edit the template" [completed]="false">
        <div id="gjs"></div>              <- Doesnt show
        <div id="blocks"></div>
    </mat-step>
    <mat-step label="Test and Save" [completed]="false">
        <div>
            <button mat-raised-button (click)="saveTemplate()" id="save-template">
                Save
            </button>
        </div>
    </mat-step>
</mat-horizontal-stepper>
        <div id="gjs"></div>          <- Shows
        <div id="blocks"></div>
<router-outlet></router-outlet>

Can you helkp?