Firebase http云功能+ Typescript异步导入+ Express.js可实现最高的冷启动性能

Question

我在我的项目中使用了Firebase http函数，它们运行良好。当我尝试改善性能时，遇到了@DougStevenson先生在improve cold start performance by organising cloud functions in better way and using typescripts async importing of source file中发表的文章。

使用Express JS编写HTTP调用的常用方法

const app = express();
app.use(cors({origin: true}));
app.use(express.json());
app.post('/placeOrder',  async (request: any, response: any) => {
    //something
});

//export this constant in index.ts
export const order = functions
    .region('asia-east2')
    .https
    .onRequest(app);

@DougStevenson提出的改善冷启动性能的建议

Index.ts

export const httpFn = functions.https.onRequest(async (request, response) => {
    await (await import('./fn/httpFn')).myFun(request, response)
})

源文件

import * as functions from 'firebase-functions'

import * as admin from 'firebase-admin'
admin.initializeApp()

export const myFun = async ( request: functions.https.Request
, response: functions.Response): Promise<void> => {

    const snapshot = await getDocument()
    const data = snapshot.data()
    response.send(data)
}

它们两者都运作良好。但是，当我尝试通过使用http post和Express.js使用相同的方法并异步调用调用加载源文件时，我无法做到这一点，而且在搜索中找不到相似的示例。

我尝试过

Index.ts

export const userOrder = functions.https.onRequest(async (request, response) => {
    await (await import('./order')).default(request, response)
});

order.ts

const express = require('express');

const app = express();
app.use(express.json());

app.get('/getOrder', async (request: any, response: any) => {
    response.status(200).send('It works!');
});
app.post('/createOrder', async (req: any, res: any) => {
    //something
});

export default app;

但是这个还没有解决，我想知道如何使用Typescript的异步导入在云函数中部署Express js端点。

谢谢。