when i add my button via js it shows error

OwlError: Invalid handler (expected a function, received: 'undefined')
my xml file

t-name="upload.DocumentsViews.Buttons" t-inherit="documents.DocumentsViews.Buttons" t-inherit-mode="extension">
    expr="//button[contains(@t-attf-class, 'o_documents_kanban_upload')]" position="after">
        

    

how can i add the  onClickCreateUpload function in js 

my sample code 

import { preSuperSetup, useDocumentView } from "@documents/views/hooks";
const { onWillStart, useComponent } = owl;

export class useDocumentViewExtend extends useDocumentView {

setup() {
        preSuperSetup();
        super.setup(...arguments);

        return {onClickCreateUpload: () => {
            action.doAction("module_name.upload_fleet_action_request_form", {
                additionalContext: {
                    default_partner_id: props.context.default_partner_id || false,
                    default_folder_id: env.searchModel.getSelectedFolderId(),
                    default_tag_ids: [x2ManyCommands.replaceWith(env.searchModel.getSelectedTagIds())],
                    default_res_id: props.context.default_res_id || false,
                    default_res_model: props.context.default_res_model || false,
                },
                fullscreen: env.isSmall,
                onClose: async () => env.model.load(),
            });
        },
      }
    }
}

but its not working 

when i add the onClickCreateUpload function in default addons its working how can i inherit the documents and add the button

thanks in advance