<p-treeTable [value]="filesStyle" [columns]="cols">
  <ng-template pTemplate="header" let-columns>
    <tr>
      <th *ngFor="let col of columns">
        { { col.header } }
      </th>
    </tr>
  </ng-template>
  <ng-template pTemplate="body" let-rowNode let-rowData="rowData" let-columns="columns">
    <tr [ngClass]="{'kb-row': rowData.size.endsWith('kb')}">
      <td *ngFor="let col of columns; let i = index" [ngClass]="{'kb-cell': col.field === 'size' && rowData.size.endsWith('kb')}">
        <p-treeTableToggler [rowNode]="rowNode" *ngIf="i == 0"></p-treeTableToggler>
        { { rowData[col.field] } }
      </td>
    </tr>
  </ng-template>
</p-treeTable>