> This readme is for gulp-babel v8 + Babel v7
> Check the 7.x branch for docs with Babel v6 usage

gulp-babel  

> Use next generation JavaScript, today, with Babel

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

Install

Install gulp-babel if you want to get the pre-release of the next version of gulp-babel.

``


Babel 7

$ npm install --save-dev gulp-babel @babel/core @babel/preset-env

Babel 6

$ npm install --save-dev gulp-babel@7 babel-core babel-preset-env
`

Usage

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

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




API

$3

#### options

See the Babel options, except for sourceMap and filename which is handled for you.




Source Maps

Use gulp-sourcemaps like this:

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

gulp.task('default', () =>
gulp.src('src/*/.js')
.pipe(sourcemaps.init())
.pipe(babel({
presets: ['@babel/env']
}))
.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

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

function logBabelMetadata() {
return through.obj((file, enc, cb) => {
console.log(file.babel.test); // 'metadata'
cb(null, file);
});
}

gulp.task('default', () =>
gulp.src('src/*/.js')
.pipe(babel({
// plugin that sets some metadata
plugins: [{
post(file) {
file.metadata.test = 'metadata';
}
}]
}))
.pipe(logBabelMetadata())
)
`




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
$ npm install --save @babel/runtime
`

Use it as plugin:

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

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

License

MIT © Sindre Sorhus