在SPFx上的MS Graph API中转换文件返回未定义

import { MSGraphClientV3 } from '@microsoft/sp-http';

export default class FileConverter {
    private context: any;

    constructor(context: any) {
        this.context = context;
    }

    public convertFile(itemId: string): Promise<any> {
        const requestUrl = `https://graph.microsoft.com/v1.0/me/drive/items/${itemId}/content?format=pdf`;

        return this.context.msGraphClientFactory.getClient().then((client: MSGraphClientV3): Promise<any> => {
            return client.api(requestUrl).get();
        }).then((response: any): any => {
            if (response && response.value) {
                return response.value;
            } else {
                throw new Error('File conversion failed: response is undefined');
            }
        }).catch((error: any): void => {
            console.error('Error during file conversion:', error);
            throw error;
        });
    }
}