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esbuild
Advanced tools
Package description
esbuild is a fast JavaScript bundler and minifier. It compiles TypeScript and JavaScript into a single file, minifies it, and can also handle CSS and image assets. It's designed for speed and efficiency, utilizing parallelism and native Go code to achieve its performance.
Bundling JavaScript
This code bundles 'app.js' and its dependencies into a single file 'out.js'.
require('esbuild').build({
entryPoints: ['app.js'],
bundle: true,
outfile: 'out.js'
}).catch(() => process.exit(1))
Minifying JavaScript
This code minifies 'app.js' to reduce file size and improve load times.
require('esbuild').build({
entryPoints: ['app.js'],
minify: true,
outfile: 'out.js'
}).catch(() => process.exit(1))
Transpiling TypeScript
This code compiles a TypeScript file 'app.ts' into JavaScript and bundles it into 'out.js'.
require('esbuild').build({
entryPoints: ['app.ts'],
bundle: true,
outfile: 'out.js'
}).catch(() => process.exit(1))
Serving files for development
This code starts a local server to serve files from the 'public' directory and bundles 'app.js' into 'public/out.js'.
require('esbuild').serve({
servedir: 'public',
port: 8000
}, {
entryPoints: ['app.js'],
bundle: true,
outfile: 'public/out.js'
}).then(server => {
// Server started
})
Webpack is a powerful and widely-used module bundler. It offers a rich plugin ecosystem and a highly configurable build process. Compared to esbuild, webpack is more mature with more features but is generally slower due to its JavaScript-based architecture.
Rollup is another JavaScript module bundler that focuses on producing efficient bundles for modern module formats like ES modules. It's known for its tree-shaking capabilities. Rollup is typically faster than webpack but slower than esbuild.
Parcel is a web application bundler that offers zero configuration out-of-the-box. It's faster than webpack and rollup but generally not as fast as esbuild. Parcel has a simpler user experience but may not be as flexible for complex configurations.
Terser is a JavaScript parser, mangler, and compressor toolkit for ES6+. It's often used for minifying JavaScript code. While esbuild also minifies code, terser is a dedicated tool for this purpose and can be used alongside other bundlers.
Readme
This is a JavaScript bundler and minifier. See https://github.com/evanw/esbuild for details.
In addition to exposing the esbuild
command-line tool, this package also exposes a JavaScript API that can be used to invoke the command-line tool from JavaScript.
The build()
API is the same as invoking the command-line tool. It reads from files on disk and writes back to files on disk. Using this API can be more convenient than managing a lot of command-line flags and also works on all platforms, unlike shell scripts. This is similar to "config files" from other bundlers.
Example build script:
const { build } = require('esbuild')
const options = {
stdio: 'inherit',
entryPoints: ['./src/main.ts'],
outfile: './dist/main.js',
minify: true,
bundle: true,
}
build(options).catch(() => process.exit(1))
See the TypeScript type definitions for the complete set of options.
The transform()
API transforms a single file in memory. It can be used to minify JavaScript, convert TypeScript/JSX to JavaScript, or convert newer JavaScript to older JavaScript. It's roughly equivalent to running build()
on a single file with bundle: false
.
To access this API you need to start a service, which is a long-lived esbuild
child process that is then reused. You can use the service to transform many files without the overhead of starting up a new child process each time.
Example usage:
(async () => {
const jsx = `
import * as React from 'react'
import * as ReactDOM from 'react-dom'
ReactDOM.render(
<h1>Hello, world!</h1>,
document.getElementById('root')
);
`
// Start the esbuild child process once
const esbuild = require('esbuild')
const service = await esbuild.startService()
// This can be called many times without the overhead of starting a service
const { js } = await service.transform(jsx, { loader: 'jsx' })
console.log(js)
// The child process can be explicitly killed when it's no longer needed
service.stop()
})()
See the TypeScript type definitions for the complete set of options.
FAQs
An extremely fast JavaScript and CSS bundler and minifier.
The npm package esbuild receives a total of 26,836,738 weekly downloads. As such, esbuild popularity was classified as popular.
We found that esbuild demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 2 open source maintainers collaborating on the project.
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