Node.js Typescript 正则表达式：过滤器返回空

我正在做一个Electron 商务API，我有这个类用于我的搜索查询，我使用正则表达式和带有 node 的类型脚本来实现这一点，我使用js node 项目来建立我的基础，但当我使用"Localhost:4000/api/Products/？Page=1"时，过滤器返回为空:

export class APIFeatures {

    query: any;
    queryStr: any;

    constructor(query: any, queryStr: any) {
        this.query = query,
            this.queryStr = queryStr
    }

    search(): any {
        const keyword = this.queryStr.keyword ? {
            name: {
                $regex: this.queryStr.keyword,
                $options: 'i'
            }
        } : {}

        this.query = this.query.find({ ...keyword })


    }


    filter(): any {

        const queryCopy = { ...this.queryStr };

        // Removing fields from the query
        const removeFields = ['keyword', 'limit', 'page']
        removeFields.forEach(el => delete queryCopy[el]);

        // Advance filter for price, ratings etc
        let queryStr = JSON.stringify(queryCopy)
        queryStr = queryStr.replace(/\b(gt|gte|lt|lte)\b/g, match => `$${match}`)
        // console.log(queryStr)

        this.query = this.query.find(JSON.parse(queryStr));
        return this;
    }

    pagination(resPerPage: any): any {
        const currentPage = Number(this.queryStr.page) || 1;
        const skip = resPerPage * (currentPage - 1);

        this.query = this.query.limit(resPerPage).skip(skip);
        return this;
    }


}

这就是产品控制器，我想在其中执行serach、过滤器和分页，以个性化来自产品数据库的查询:

 async getAllProducts(req: Request, res: Response) {
        try {

            const resPerPage = 8;
            const productCount = await prisma.product.count();

            const apiFeatures = new APIFeatures(prisma.product.findMany(), req.query)
                .search()
                .filter()
                .pagination(resPerPage)

            const response = apiFeatures.query;

            return res.status(200).send({ success: true, response, 
   productCount })
        } catch (error) {
            res.send({
                message: error
            })
        }
    }

问题是为什么我的查询返回为空