Transforming JavaScript into TypeScript - school project

After researching similar questions and answers, it appears that any valid JavaScript code can also be considered TypeScript?

If this is true:

const express     = require('express');
const bodyParser  = require('body-parser');

const app = express();

app.use(bodyParser.json());

const port = process.env.PORT || 5000;

app.listen(port, () => console.log(`Server started on port ${port}`));

Attempting to convert to TypeScript:

import express     = require('express');
import bodyParser  = require('body-parser');

const app = express();

app.use(bodyParser.json());

const port: number; 

port = process.env.PORT || 5000;

app.listen(port, () => console.log(`Server started on port ${port}`));

Answer №1

const express = require("express");
const bodyParser = require("body-parser");
const path = require("path");
const config = require("config");

const app = express();
app.use(bodyParser.json());
const port = process.env.PORT || 5000;
app.listen(port, () => console.log(`Server running on port ${port}`));

While the code above can still be considered valid JavaScript, it is more in line with idiomatic TypeScript practices. This is because TypeScript ensures that imported modules are of the correct type with the use of import, while require can result in a generic any type.

For projects involving Express, Node.js, and TypeScript, I recommend starting with this demo application provided by Microsoft. It serves as an excellent boilerplate for working with these technologies. https://github.com/microsoft/TypeScript-Node-Starter

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