How to use the aurelia-slickgrid.Editors.checkbox 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
    };
  }

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
    }, {
      id: 'prerequisites',
      name: 'Prerequisites',
      field: 'prerequisites',
      filterable: true,
      formatter: taskFormatter,
      minWidth: 100,
      sortable: true,
      type: FieldType.string,
      editor: {
        // We can load the "collection" asynchronously (on first load only, after that we will simply use "collection")
        // 3 ways are supported (aurelia-http-client, aurelia-fetch-client OR even Promise)

        // 1- USE HttpClient from "aurelia-http-client" to load collection asynchronously

customStructure: { label: 'name', value: 'code' },
          collectionAsync: this.httpFetch.fetch(URL_COUNTRIES_COLLECTION),
        }
      }, {
        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
      }, {
        id: 'prerequisites',
        name: 'Prerequisites',
        field: 'prerequisites',
        filterable: true,
        formatter: taskFormatter,
        minWidth: 100,
        sortable: true,
        type: FieldType.string,
        editor: {
          // We can load the "collection" asynchronously (on first load only, after that we will simply use "collection")
          // 3 ways are supported (aurelia-http-client, aurelia-fetch-client OR even Promise)

          // 1- USE HttpClient from "aurelia-http-client" to load collection asynchronously

defineGrid() {
    this.columnDefinitions = [
      { id: 'title', name: 'Title', field: 'title', sortable: true, type: FieldType.string, editor: Editors.longText },
      {
        id: 'duration', name: 'Duration (days)', field: 'duration', sortable: true, type: FieldType.number, editor: Editors.text,
        onCellChange: (args: OnEventArgs) => {
          alert('onCellChange directly attached to the column definition');
          console.log(args);
        }
      },
      { id: 'complete', name: '% Complete', field: 'percentComplete', formatter: Formatters.percentCompleteBar, type: FieldType.number, editor: Editors.integer },
      { id: 'start', name: 'Start', field: 'start', formatter: Formatters.dateIso, sortable: true, type: FieldType.date/*, editor: Editors.date*/ },
      { id: 'finish', name: 'Finish', field: 'finish', formatter: Formatters.dateIso, sortable: true, type: FieldType.date },
      { id: 'effort-driven', name: 'Effort Driven', field: 'effortDriven', formatter: Formatters.checkmark, type: FieldType.number, editor: Editors.checkbox }
    ];

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

editor: {
          model: Editors.date
        }
        */
      },
      {
        id: 'finish', name: 'Finish', field: 'finish',
        formatter: Formatters.dateIso, sortable: true,
        type: FieldType.date
      },
      {
        id: 'effort-driven', name: 'Effort Driven', field: 'effortDriven',
        formatter: Formatters.checkmark,
        type: FieldType.number,
        editor: {
          model: Editors.checkbox
        }
      }
    ];

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

editor: {
          model: Editors.date
        }
        */
      },
      {
        id: 'finish', name: 'Finish', field: 'finish',
        formatter: Formatters.dateIso, sortable: true,
        type: FieldType.date
      },
      {
        id: 'effort-driven', name: 'Effort Driven', field: 'effortDriven',
        formatter: Formatters.checkmark,
        type: FieldType.number,
        editor: {
          model: Editors.checkbox
        }
      }
    ];

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