Angular 7 + Ag-Grid在控制台中显示不正确的警告

Question

我正在使用Angular 7和ag-Grid社区版v19.x，并在列def中使用“ sortable”属性

 this.columnDefs =  [
    {headerName: 'First Name ', field: 'firstName', sortable: true, filter: true },
    {headerName: 'Last Name', field: 'lastName', sortable: true, filter: true },
    {headerName: 'DOB', width: 150, field: 'dob', sortable: false, filter: false},        
    {headerName: 'Document', width: 400, field: 'documentName', sortable: true, filter: true},
    {headerName: 'Reference', field: 'reference'}
  ];

但是，当我运行该应用程序时，控制台会显示以下警告

ag-grid: invalid colDef property 'sortable' did you mean any of these: