Introduction to esbuild-register

The esbuild-register package allows developers to use the powerful esbuild JavaScript bundler and minifier. With esbuild-register, you can seamlessly require ES6+ modules in node.js with speed and efficiency.

Getting Started

To start using esbuild-register, first install it via npm:

npm install esbuild-register

Then, register it in your code:

require('esbuild-register')

API Examples

esbuild-register offers a simple and effective API to work with modern JavaScript and TypeScript files. Here are several key APIs:

Transform

The transform API transforms code from one format to another:

const { transformSync } = esbuild;

const result = transformSync('let x: number = 1', { loader: 'ts' });
console.log(result);

Build

The build API bundles JavaScript files:

require('esbuild').build({
  entryPoints: ['./src/index.js'],
  outfile: 'out.js',
  bundle: true,
}).catch(() => process.exit(1))

Register

You can use the register function to enable support for ES modules:

require('esbuild-register').register()

Example Application

Let’s build a small Express.js application with ES Module support:

// Install dependencies
// npm install express esbuild-register

// server.js
require('esbuild-register');

import express from 'express';

const app = express();

app.get('/', (req, res) => {
  res.send('Hello from ESBuild Registered Express.js app!');
});

app.listen(3000, () => {
  console.log('Server is running on http://localhost:3000');
});

With this setup, you can effortlessly use modern JavaScript features in your Express.js application, enhancing development speed and experience.

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