How to use the @microsoft/sp-lodash-subset.update function in @microsoft/sp-lodash-subset

private onListChange(propertyPath: string, newValue: any): void {
    const oldValue: any = get(this.properties, propertyPath);
    if (oldValue !== newValue) {
      this.properties.fields = null;
    }
    // store new value in web part properties
    update(this.properties, propertyPath, (): any => newValue);
    // refresh property Pane
    this.context.propertyPane.refresh();
    // refresh web part
    this.render();
  }

private onListItemChange(propertyPath: string, oldValue: any, newValue: any): void {
    //update the property value
    update(this.properties, propertyPath, (): any => { return newValue; });

    // store selected item reset in web part properties
    this.onPropertyPaneFieldChanged(propertyPath, oldValue, newValue);
  }

private onCustomPropertyPaneChange(propertyPath: string, newValue: any): void {
    Log.verbose(this.logSource, "WebPart property '" + propertyPath + "' has changed, refreshing WebPart...", this.context.serviceScope);
    let rerenderTemplateTextDialog = false;
    const oldValue = get(this.properties, propertyPath);
    
    // Stores the new value in web part properties
    update(this.properties, propertyPath, (): any => { return newValue; });
    this.onPropertyPaneFieldChanged(propertyPath, oldValue, newValue);

    // Resets dependent property panes if needed
    this.resetDependentPropertyPanes(propertyPath);

    // If the viewfields have changed, update the default template text if it hasn't been altered by the user
    if(propertyPath == ContentQueryConstants.propertyViewFields && !this.properties.hasDefaultTemplateBeenUpdated) {
      let generatedTemplate = this.ContentQueryService.generateDefaultTemplate(newValue);
      update(this.properties, ContentQueryConstants.propertyTemplateText, (): any => { return generatedTemplate; });
      this.templateTextDialog.properties.dialogTextFieldValue = generatedTemplate;
      rerenderTemplateTextDialog = true;
    }

    // If the templateText have changed, update the "hasDefaultTemplateBeenUpdated" to true so the WebPart doesn't override the user template after updating view fields
    if(propertyPath == ContentQueryConstants.propertyTemplateText && !this.properties.hasDefaultTemplateBeenUpdated) {
      update(this.properties, ContentQueryConstants.propertyhasDefaultTemplateBeenUpdated, (): any => { return true; });
    }

    // Refreshes the web part manually because custom fields don't update since sp-webpart-base@1.1.1
    // https://github.com/SharePoint/sp-dev-docs/issues/594
    if (!this.disableReactivePropertyChanges)
      this.render();

    if(rerenderTemplateTextDialog) {
      this.templateTextDialog.render();

private resetViewFieldsPropertyPane() {
    Log.verbose(this.logSource, "Resetting 'viewFields' property...", this.context.serviceScope);

    this.properties.viewFields = null;
    this.ContentQueryService.clearCachedViewFields();
    update(this.properties, ContentQueryConstants.propertyViewFields, (): any => { return this.properties.viewFields; });
    this.viewFieldsChecklist.properties.checkedItems = null;
    this.viewFieldsChecklist.properties.disable = isEmpty(this.properties.webUrl) || isEmpty(this.properties.listId);
    this.viewFieldsChecklist.render();
  }
}

private resetOrderByPropertyPane() {
    Log.verbose(this.logSource, "Resetting 'orderBy' property...", this.context.serviceScope);

    this.properties.orderBy = null;
    this.ContentQueryService.clearCachedOrderByOptions();
    update(this.properties, ContentQueryConstants.propertyOrderBy, (): any => { return this.properties.orderBy; });
    this.orderByDropdown.properties.selectedKey = "";
    this.orderByDropdown.properties.disabled = isEmpty(this.properties.webUrl) || isEmpty(this.properties.listId);
    this.orderByDropdown.render();
  }

private resetWebUrlPropertyPane() {
    Log.verbose(this.logSource, "Resetting 'webUrl' property...", this.context.serviceScope);

    this.properties.webUrl = "";
    this.ContentQueryService.clearCachedWebUrlOptions();
    update(this.properties, ContentQueryConstants.propertyWebUrl, (): any => { return this.properties.webUrl; });
    this.webUrlDropdown.properties.selectedKey = "";
    this.webUrlDropdown.properties.disabled = isEmpty(this.properties.siteUrl);
    this.webUrlDropdown.render();
  }

private resetFiltersPropertyPane() {
    Log.verbose(this.logSource, "Resetting 'filters' property...", this.context.serviceScope);

    this.properties.filters = null;
    this.ContentQueryService.clearCachedFilterFields();
    update(this.properties, ContentQueryConstants.propertyFilters, (): any => { return this.properties.filters; });
    this.filtersPanel.properties.filters = null;
    this.filtersPanel.properties.disabled = isEmpty(this.properties.webUrl) || isEmpty(this.properties.listId);
    this.filtersPanel.render();
  }

private resetListTitlePropertyPane() {
    Log.verbose(this.logSource, "Resetting 'listTitle' property...", this.context.serviceScope);

    this.properties.listId = null;
    this.ContentQueryService.clearCachedListTitleOptions();
    update(this.properties, ContentQueryConstants.propertyListId, (): any => { return this.properties.listId; });
    this.listTitleDropdown.properties.selectedKey = "";
    this.listTitleDropdown.properties.disabled = isEmpty(this.properties.webUrl);
    this.listTitleDropdown.render();
  }