How to call AliCloud's DirectMail JS SDK in your TypeScript ES project

ESTypeScriptExampleOfCallingAlicloudDirectMailJSSDK.ts

//Here is a rescue if you meet "TypeError: Dm20151123 is not a constructor" or similar errors when calling Alicloud DirectMail JS SDK in your TypeScript with ES module project
//https://api.alibabacloud.com/api-tools/sdk/Dm?version=2015-11-23&language=nodejs-tea&tab=primer-doc
//It seems SDK uses commonjs (CJS) module only
//So the fix is to build a wrapper using TypeScript CJS, and call it from your TypeScript ES project
//here is an example

//如果在TypeScript with ES模块项目中调用阿里云DirectMail JS SDK时遇到“TypeError: Dm20151123 is not a constructor”或类似错误，这里有一个救援方法
//https://api.alibabacloud.com/api-tools/sdk/Dm?version=2015-11-23&language=nodejs-tea&tab=primer-doc
//看来SDK只使用了commonjs (CJS)模块
//因此解决方法是使用 TypeScript CJS 构建一个包装器(Wrapper)，并从 TypeScript ES 项目中调用它
//这是一个例子


//1. Wrapper CJS Project with '@alicloud/dm20151123'

//tsconfig.json
{
  "compilerOptions": {
    "target": "es2020",
    "module": "esnext",
    "declaration": true,
    "sourceMap": true,
    "outDir": "./dist",
    "esModuleInterop": true
    
  },
  "include": [
    "src/**/*"
  ]
}


//client.ts, with example code from https://api.aliyun.com/home
import Dm20151123, * as $Dm20151123 from '@alicloud/dm20151123';
import OpenApi, * as $OpenApi from '@alicloud/openapi-client';
import Util, * as $Util from '@alicloud/tea-util';
import * as $tea from '@alicloud/tea-typescript';

function createClient(accessKeyId: string, accessKeySecret: string): Dm20151123 {
    let config = new $OpenApi.Config({
        // 必填，您的 AccessKey ID
        accessKeyId: accessKeyId,
        // 必填，您的 AccessKey Secret
        accessKeySecret: accessKeySecret,
    });
    // Endpoint 请参考 https://api.aliyun.com/product/Dm
    config.endpoint = `dm.aliyuncs.com`;
    return new Dm20151123(config);
}

const ALIBABA_CLOUD_ACCESS_KEY_ID = '<request_api_key_from_alicloud_console>';
const ALIBABA_CLOUD_ACCESS_KEY_SECRET = '<request_api_secret_from_alicloud_console>';
let client = createClient(ALIBABA_CLOUD_ACCESS_KEY_ID, ALIBABA_CLOUD_ACCESS_KEY_SECRET);

async function sendMailViaAliyun(email: string, content: string, subject: string): Promise<void> {
    let singleSendMailRequest = new $Dm20151123.SingleSendMailRequest({
        accountName: "[email protected]",
        addressType: 1,
        replyToAddress: true,
        toAddress: email,
        subject: subject,
        //htmlBody: content,
        textBody: content,
        fromAlias: "<your_sender_alias>",
    });
    let runtime = new $Util.RuntimeOptions({ });
    try {
        // 复制代码运行请自行打印 API 的返回值
        await client.singleSendMailWithOptions(singleSendMailRequest, runtime);
    } catch (error) {    
        // 错误 message
        console.log(error.message);
        // 诊断地址
        console.log(error.data["Recommend"]);
        Util.assertAsString(error.message);
    }    
}

//for testing
//await sendMail('[email protected]', 'test content', 'test subject');

export default sendMailViaAliyun;

//package.json
{
  "name": "",
  "version": "1.0.0",
  "description": "",
  "main": "dist/client.js",
  "scripts": {
    "test": "mocha --reporter spec --timeout 3000 test/*.test.js",
    "test-cov": "nyc -e .ts -r=html -r=text -r=lcov npm run test",
    "build": "tsc",
    "prepublishOnly": "tsc"
  },
  "author": "",
  "license": "ISC",
  "devDependencies": {
    "@types/node": "^12.12.26",
    "nyc": "^15.0.0",
    "source-map-support": "^0.5.16",
    "ts-node": "^8.6.2",
    "typescript": "^3.7.5"
  },
  "dependencies": {
    "@alicloud/tea-typescript": "^1.7.1",
    "@alicloud/dm20151123": "1.0.8",
    "@alicloud/openapi-client": "^0.4.7",
    "@alicloud/tea-console": "^1.0.0",
    "@alicloud/tea-util": "^1.4.7"
  },
  "files": [
    "dist",
    "src"
  ]
}

//Build it in terminal
npm run build
  
  
//2. Your TS project with ES module

//tsconfig.json
  {
  "compilerOptions": {
    "types": ["node"],
    "lib": ["ES2020"],
    "target": "ES2020" /* Specify ECMAScript target version: 'ES3' (default), 'ES5', 'ES2015', 'ES2016', 'ES2017', 'ES2018', 'ES2019', 'ES2020', or 'ESNEXT'. */,
    "module": "esnext" /* esnext - Specify module code generation: 'none', 'commonjs', 'amd', 'system', 'umd', 'es2015', 'es2020', or 'ESNext'. */,
    "outDir": "./types" /* Redirect output structure to the directory. */,
...
  }

//main.ts
//copy client.js (renamed to client.cjs), client.d.ts, client.js.map to your project's /dist sub-folder
import { createRequire } from 'module';
const require = createRequire(import.meta.url);
const sendMail = require('../dist/client.cjs').default;

//specify target email, subject and text content to verify if it works! 
await sendMail(email, content, subject);

//enjoy