How to use the aurelia-slickgrid.Editors.date function in aurelia-slickgrid

{
        id: 'delete', field: 'id',
        formatter: Formatters.deleteIcon,
        minWidth: 30,
        maxWidth: 30,
        // use onCellClick OR grid.onClick.subscribe which you can see down below
        onCellClick: (args: OnEventArgs) => {
          console.log(args);
          alert(`Deleting: ${args.dataContext.title}`);
        }
      },
      { id: 'title', name: 'Title', field: 'title', sortable: true, type: FieldType.string, editor: Editors.longText, minWidth: 100 },
      { id: 'duration', name: 'Duration (days)', field: 'duration', sortable: true, type: FieldType.number, editor: Editors.text, minWidth: 100 },
      { id: 'complete', name: '% Complete', field: 'percentComplete', formatter: Formatters.percentCompleteBar, type: FieldType.number, editor: Editors.integer, minWidth: 100 },
      { id: 'start', name: 'Start', field: 'start', formatter: Formatters.dateIso, sortable: true, minWidth: 100, type: FieldType.date, editor: Editors.date },
      { id: 'finish', name: 'Finish', field: 'finish', formatter: Formatters.dateIso, sortable: true, minWidth: 100, type: FieldType.date, editor: Editors.date },
      { id: 'effort-driven', name: 'Effort Driven', field: 'effortDriven', formatter: Formatters.checkmark, type: FieldType.number, editor: Editors.checkbox, minWidth: 100 }
    ];

    this.gridOptions = {
      asyncEditorLoading: false,
      autoEdit: this.isAutoEdit,
      autoResize: {
        containerId: 'demo-container',
        sidePadding: 15
      },
      editable: true,
      enableCellNavigation: true
    };
  }

},
      {
        id: 'delete', field: 'id',
        formatter: Formatters.deleteIcon,
        minWidth: 30,
        maxWidth: 30,
        // use onCellClick OR grid.onClick.subscribe which you can see down below
        onCellClick: (args: OnEventArgs) => {
          console.log(args);
          alert(`Deleting: ${args.dataContext.title}`);
        }
      },
      { id: 'title', name: 'Title', field: 'title', sortable: true, type: FieldType.string, editor: Editors.longText, minWidth: 100 },
      { id: 'duration', name: 'Duration (days)', field: 'duration', sortable: true, type: FieldType.number, editor: Editors.text, minWidth: 100 },
      { id: 'complete', name: '% Complete', field: 'percentComplete', formatter: Formatters.percentCompleteBar, type: FieldType.number, editor: Editors.integer, minWidth: 100 },
      { id: 'start', name: 'Start', field: 'start', formatter: Formatters.dateIso, sortable: true, minWidth: 100, type: FieldType.date, editor: Editors.date },
      { id: 'finish', name: 'Finish', field: 'finish', formatter: Formatters.dateIso, sortable: true, minWidth: 100, type: FieldType.date, editor: Editors.date },
      { id: 'effort-driven', name: 'Effort Driven', field: 'effortDriven', formatter: Formatters.checkmark, type: FieldType.number, editor: Editors.checkbox, minWidth: 100 }
    ];

    this.gridOptions = {
      asyncEditorLoading: false,
      autoEdit: this.isAutoEdit,
      autoResize: {
        containerId: 'demo-container',
        sidePadding: 15
      },
      editable: true,
      enableCellNavigation: true
    };
  }

minWidth: 100,
        params: {
          formatters: [Formatters.collectionEditor, Formatters.percentCompleteBar],
        }
      }, {
        id: 'start',
        name: 'Start',
        field: 'start',
        filterable: true,
        filter: { model: Filters.compoundDate },
        formatter: Formatters.dateIso,
        sortable: true,
        minWidth: 100,
        type: FieldType.date,
        editor: {
          model: Editors.date
        },
      }, {
        id: 'finish',
        name: 'Finish',
        field: 'finish',
        filterable: true,
        filter: { model: Filters.compoundDate },
        formatter: Formatters.dateIso,
        sortable: true,
        minWidth: 100,
        type: FieldType.date,
        editor: {
          model: Editors.date,
          // override any of the Flatpickr options through "editorOptions"
          // please note that there's no TSlint on this property since it's generic for any filter, so make sure you entered the correct filter option(s)
          editorOptions: {

type: FieldType.date,
        editor: {
          model: Editors.date
        },
      }, {
        id: 'finish',
        name: 'Finish',
        field: 'finish',
        filterable: true,
        filter: { model: Filters.compoundDate },
        formatter: Formatters.dateIso,
        sortable: true,
        minWidth: 100,
        type: FieldType.date,
        editor: {
          model: Editors.date,
          // override any of the Flatpickr options through "editorOptions"
          // please note that there's no TSlint on this property since it's generic for any filter, so make sure you entered the correct filter option(s)
          editorOptions: {
            minDate: 'today'
          }
        },
      }, {
        id: 'cityOfOrigin', name: 'City of Origin', field: 'cityOfOrigin',
        filterable: true,
        sortable: true,
        minWidth: 100,
        editor: {
          model: Editors.autoComplete,
          placeholder: '🔍 search city',

          // We can use the autocomplete through 3 ways "collection", "collectionAsync" or with your own autocomplete options

type: FieldType.date,
      editor: {
        model: Editors.date
      }
    }, {
      id: 'finish',
      name: 'Finish',
      field: 'finish',
      filterable: true,
      filter: { model: Filters.compoundDate },
      formatter: Formatters.dateIso,
      sortable: true,
      minWidth: 100,
      type: FieldType.date,
      editor: {
        model: Editors.date
      }
    }, {
      id: 'effort-driven',
      name: 'Effort Driven',
      field: 'effortDriven',
      filterable: true,
      type: FieldType.boolean,
      filter: {
        model: Filters.singleSelect,
        collection: [{ value: '', label: '' }, { value: true, label: 'True' }, { value: false, label: 'False' }]
      },
      formatter: Formatters.checkmark,
      editor: {
        model: Editors.checkbox
      },
      minWidth: 70

minWidth: 100,
      params: {
        formatters: [Formatters.collectionEditor, Formatters.percentCompleteBar]
      }
    }, {
      id: 'start',
      name: 'Start',
      field: 'start',
      filterable: true,
      filter: { model: Filters.compoundDate },
      formatter: Formatters.dateIso,
      sortable: true,
      minWidth: 100,
      type: FieldType.date,
      editor: {
        model: Editors.date
      }
    }, {
      id: 'finish',
      name: 'Finish',
      field: 'finish',
      filterable: true,
      filter: { model: Filters.compoundDate },
      formatter: Formatters.dateIso,
      sortable: true,
      minWidth: 100,
      type: FieldType.date,
      editor: {
        model: Editors.date
      }
    }, {
      id: 'effort-driven',