title: ag-grid angular 5 export hidde, columns
body: <p>I am working on a export feature for my ag-grid columns on angular 5 </p>
  
  <p>here is the code for my columns :</p>
  
  <pre><code>columnDefs = [{  
    headerName:'',
    field:'',
    pinned:true,
    headerCheckboxSelection:true,
    headerCheckboxSelectionFilteredOnly:true,
    width:42,
    checkboxSelection:true
  }, {  
    headerName:'Actions',
    field:'_id.$oid',
    cellRenderer:'viewModalRenderer',
    pinned:true
  }, {  
    headerName:'Status',
    field:'status'
  }, {  
    headerName:'Category',
    field:'category',
    cellRenderer:'viewCetegoryRenderer',
    width:120,
    editable:true,
    hide:true
  }, {  
    headerName:'Created',
    field:'created',
    editable:true,
    filter:'agDateColumnFilter'
  }, {  
    headerName:'Price',
    field:'price',
    filter:'agNumberColumnFilter',
    width:120,
    editable:true
  }];
  </code></pre>
  
  <p>I am calling this function to export </p>
  
  <pre><code>onBtnExport() {
    let params = {}
    this.gridApi.exportDataAsCsv(params);
  }
  </code></pre>
  
  <p>How to include the Category column marked as hide: true in my export ?</p>