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Babelify is a browserify transform for Babel, which allows you to use Babel to transpile your JavaScript files when bundling them with Browserify. This enables you to use the latest JavaScript features and syntax in your code, and have them transpiled to a version of JavaScript that is compatible with older browsers.
Transpile ES6 to ES5
This feature allows you to transpile modern JavaScript (ES6) to ES5, making it compatible with older browsers. The code sample demonstrates how to use Babelify with Browserify to transform a source file using the '@babel/preset-env' preset.
const browserify = require('browserify');
const babelify = require('babelify');
browserify('./src/app.js')
.transform(babelify, { presets: ['@babel/preset-env'] })
.bundle()
.pipe(process.stdout);
Use JSX with React
This feature allows you to use JSX syntax with React. The code sample shows how to configure Babelify to transform a JSX file using the '@babel/preset-react' preset.
const browserify = require('browserify');
const babelify = require('babelify');
browserify('./src/app.jsx')
.transform(babelify, { presets: ['@babel/preset-react'] })
.bundle()
.pipe(process.stdout);
Custom Babel Plugins
This feature allows you to use custom Babel plugins. The code sample demonstrates how to use the '@babel/plugin-transform-arrow-functions' plugin to transform arrow functions in your code.
const browserify = require('browserify');
const babelify = require('babelify');
browserify('./src/app.js')
.transform(babelify, { plugins: ['@babel/plugin-transform-arrow-functions'] })
.bundle()
.pipe(process.stdout);
Babel-loader is a webpack loader that allows you to transpile JavaScript files using Babel and webpack. It is similar to Babelify in that it uses Babel to transpile code, but it is designed to work with webpack instead of Browserify.
Rollup-plugin-babel is a Rollup plugin that allows you to use Babel to transpile your JavaScript files when bundling them with Rollup. It provides similar functionality to Babelify but is designed to work with Rollup instead of Browserify.
Gulp-babel is a Gulp plugin that allows you to use Babel to transpile your JavaScript files in a Gulp build pipeline. It offers similar functionality to Babelify but is intended for use with Gulp instead of Browserify.
Babel browserify transform.
As of Babel 6.0.0 there are no plugins included by default. For babelify to be useful, you must also include some presets and/or plugins.
$ npm install --save-dev babelify
$ browserify script.js -o bundle.js -t [ babelify --presets [ es2015 react ] ]
var fs = require("fs");
var browserify = require("browserify");
browserify("./script.js")
.transform("babelify", {presets: ["es2015", "react"]})
.bundle()
.pipe(fs.createWriteStream("bundle.js"));
NOTE: Presets and plugins need to be installed as separate modules. For the above examples to work, you'd need to also install babel-preset-es2015
and babel-preset-react
:
$ npm install --save-dev babel-preset-es2015 babel-preset-react
Selected options are discussed below. See the babel docs for the complete list of options.
Options may be passed in via standard browserify ways:
$ browserify -t [ babelify --presets [ es2015 react ] ]
browserify().transform("babelify", {presets: ["es2015", "react"]});
var babelify = require("babelify");
browserify().transform(babelify, {presets: ["es2015", "react"]});
Or, with the configure
method:
browserify().transform(babelify.configure({
presets: ["es2015", "react"]
}));
By default, all files with the extensions .js
, .es
, .es6
and .jsx
are compiled. You can change this by passing an array of extensions.
NOTE: This will override the default ones so if you want to use any of them you have to add them back.
browserify().transform("babelify", {extensions: [".babel"]});
$ browserify -t [ babelify --extensions .babel ]
Now you can use:
import NavBar from "nav-bar.babel";
var Panels = require("panels.babel");
NOTE: By default, Browserify will only lookup .js
and .json
files when the extension is ommited (like node's require
). To lookup additional extensions, use browserify's extensions
option.
browserify({
extensions: [".babel"]
}).transform("babelify", {
extensions: [".babel"]
});
$ browserify --extensions=.babel -t [ babelify --extensions .babel ]
Now you can omit the extension and compile .babel
files:
import NavBar from "nav-bar";
var Panels = require("panels");
By default, browserify sets the source map sources paths relative to the basedir (or to process.cwd()
if not set). To make the sources paths absolute, set the sourceMapsAbsolute
option on babelify:
browserify().transform("babelify", {
sourceMapsAbsolute: true
});
$ browserify -t [ babelify --sourceMapsAbsolute ]
browserify().transform(babelify.configure({
// Optional ignore regex - if any filenames **do** match this regex then
// they aren't compiled
ignore: /regex/,
// Optional only regex - if any filenames **don't** match this regex
// then they aren't compiled
only: /my_es6_folder/
}))
$ browserify -t [ babelify --ignore regex --only my_es6_folder ]
Babelify emits a babelify
event with Babel's full result object as the first
argument, and the filename as the second. Browserify doesn't pass-through the
events emitted by a transform, so it's necessary to get a reference to the
transform instance before you can attach a listener for the event:
var b = browserify().transform(babelify);
b.on("transform", function(tr) {
if (tr instanceof babelify) {
tr.once("babelify", function(result, filename) {
result; // => { code, map, ast, metadata }
});
}
});
node_modules
being transformed?This is the default browserify behavior.
A possible solution is to add:
{
"browserify": {
"transform": ["babelify"]
}
}
to the root of all your modules package.json
that you want to be transformed. If you'd like to
specify options then you can use:
{
"browserify": {
"transform": [["babelify", { "presets": ["es2015"] }]]
}
}
Another solution (proceed with caution!) is to run babelify as a global transform. Use the babel ignore
option to narrow the number of files transformed:
browserify().transform(babelify, {
global: true,
ignore: /\/node_modules\/(?!app\/)/
});
The above example will transform all files except those in the node_modules
directory that are not in node_modules/app
.
To use source maps, enable them in browserify with the debug
option:
browserify({debug: true}).transform("babelify");
$ browserify -d -t [ babelify ]
If you want the source maps to be of the post-transpiled code, then leave debug
on, but turn off babelify's sourceMaps
:
browserify({debug: true}).transform("babelify", {sourceMaps: false});
$ browserify -d -t [ babelify --no-sourceMaps ]
FAQs
Babel browserify transform
The npm package babelify receives a total of 627,172 weekly downloads. As such, babelify popularity was classified as popular.
We found that babelify demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 3 open source maintainers collaborating on the project.
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