gulp-babel2

gulp-babel

Use next generation JavaScript, today, with Babel

Issues with the output should be reported on the Babel issue tracker.

Install

$ npm install --save-dev gulp-babel babel-preset-es2015

Usage

const gulp = require('gulp');
const babel = require('gulp-babel');

gulp.task('default', () =>
	gulp.src('src/app.js')
		.pipe(babel({
			presets: ['es2015']
		}))
		.pipe(gulp.dest('dist'))
);

API

const createBabel = require('gulp-babel');

/**
 * @see https://github.com/isaacs/node-lru-cache#options
 */
type lruOptions = {
	max: ?number,
	length: ?Function,
	dispose: ?Function,
	maxAge: ?number
};

/**
 * @see See the Babel options (https://babeljs.io/docs/usage/options/), except for `sourceMap` and `filename` which is handled for you.
 */
type babelOptions = {};

const babel = createBabel({max: 500}: lruOptions);

babel({}: babelOptions);

Source Maps

Use gulp-sourcemaps like this:

const gulp = require('gulp');
const sourcemaps = require('gulp-sourcemaps');
const createBabel = require('gulp-babel');
const concat = require('gulp-concat');

const babel = createBabel();

gulp.task('default', () =>
	gulp.src('src/**/*.js')
		.pipe(sourcemaps.init())
		.pipe(babel({
			presets: ['es2015']
		}))
		.pipe(concat('all.js'))
		.pipe(sourcemaps.write('.'))
		.pipe(gulp.dest('dist'))
);

Babel Metadata

Files in the stream are annotated with a babel property, which contains the metadata from babel.transform().

Example

const gulp = require('gulp');
const createBabel = require('gulp-babel');
const through = require('through2');

const babel = createBabel();

function logFileHelpers() {
	return through.obj((file, enc, cb) => {
		console.log(file.babel.usedHelpers);
		cb(null, file);
	});
}

gulp.task('default', () =>
	gulp.src('src/**/*.js')
		.pipe(babel({
			presets: ['es2015']
		}))
		.pipe(logFileHelpers())
)

Runtime

If you're attempting to use features such as generators, you'll need to add transform-runtime as a plugin, to include the Babel runtime. Otherwise, you'll receive the error: regeneratorRuntime is not defined.

Install the runtime:

$ npm install --save-dev babel-plugin-transform-runtime

Use it as plugin:

const gulp = require('gulp');
const createBabel = require('gulp-babel');

const babel = createBabel();

gulp.task('default', () =>
	gulp.src('src/app.js')
		.pipe(babel({
			plugins: ['transform-runtime']
		}))
		.pipe(gulp.dest('dist'))
);

License

MIT © Sindre Sorhus