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gulp-babel

gulp-babel Build Status

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-env

Usage

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

License

MIT © Sindre Sorhus