babel
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-envUsage
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
babel([options])
options
See the Babel options, except for sourceMap and filename which is handled for you.
Source Maps
Use gulp-sourcemaps like this:
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
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:
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