为什么我的ts类型不对呢

// 依赖的模块可通过下载工程中的模块依赖文件或右上角的获取 SDK 依赖信息查看
import Dysmsapi20170525, * as $Dysmsapi20170525 from '@alicloud/dysmsapi20170525';
import * as $OpenApi from '@alicloud/openapi-client';
import * as $Util from '@alicloud/tea-util';
import Credential from '@alicloud/credentials';

export default class AliyunClient {

/**

• @remarks
• 使用凭据初始化账号Client
• @returns Client
• @throws Exception
  */
  static createClient(): Dysmsapi20170525 {
  // 工程代码建议使用更安全的无AK方式，凭据配置方式请参见：https://help.aliyun.com/document_detail/378664.html。
  let credential = new Credential({

})
let config = new $OpenApi.Config({
  credential: credential,
});
// Endpoint 请参考 https://api.aliyun.com/product/Dysmsapi
config.endpoint = `dysmsapi.aliyuncs.com`;
return new Dysmsapi20170525(config);

}

static async main(): Promise {
let client = this.createClient();
let sendSmsRequest = new $Dysmsapi20170525.SendSmsRequest({
phoneNumbers: "17368xxxxxx",
signName: "镇江市简界科技",
templateCode: "SMS_5xxxxxx",
templateParam: "{"name":"1234"}",
});
let runtime = new $Util.RuntimeOptions({ });
try {
let resp = await client.sendSmsWithOptions(sendSmsRequest, runtime);
console.log(JSON.stringify(resp, null, 2));
} catch (error:any) {
// 此处仅做打印展示，请谨慎对待异常处理，在工程项目中切勿直接忽略异常。
// 错误 message
console.log(error.message);
// 诊断地址
console.log(error.data["Recommend"]);
}
}

}

Credential
此表达式不可构造。
类型 "typeof import("/Users/nijie/Documents/\u6700\u65B0\u6784\u5EFA/gamerApp_server/node_modules/@alicloud/credentials/dist/src/client")" 没有构造签名。ts(2351)
Dysmsapi20170525
不能将命名空间“Dysmsapi20170525”用作类型

Start by reproducing the two TypeScript diagnostics in the shown imports and calls, especially @alicloud/credentials and @alicloud/dysmsapi20170525. Inspect the published declarations under node_modules/@alicloud/credentials/dist/src/client and the SDK package typings, then verify that the intended credential construction and Dysmsapi20170525 type usage are accepted by TypeScript.