How to autosize the "auto group column"?

Question

How to auto resize all columns, including the auto group column ?

The following code only resizes standard columns and not the auto group column as this.gridColumnApi.getAllColumns() doesn't return the auto group column :

autoSizeAllColumns() {
  const allColumnIds = this.gridColumnApi.getAllColumns().map(c => c.colId)
  this.gridColumnApi.autoSizeColumns(allColumnIds)
},

Answer 1

I was able to size and autosize the autogroup column directly by using the colID (which I learned is 'ag-Grid-AutoColumn').

To size it specifically:

onGridReady:function(params)
{
    params.columnApi.setColumnWidth('ag-Grid-AutoColumn', 250);
}

To autosize:

onFirstDataRendered:function(params)
{
    params.columnApi.autoSizeColumn('ag-Grid-AutoColumn');
}