Use next generation JavaScript, today, with Babel
Issues with the output should be reported on the Babel issue tracker.
$ npm install --save-dev gulp-babel babel-preset-es2015
const gulp = require('gulp');
const babel = require('gulp-babel');
gulp.task('default', () => {
return gulp.src('src/app.js')
.pipe(babel({
presets: ['es2015']
}))
.pipe(gulp.dest('dist'));
});
See the Babel options, except for sourceMap
and filename
which is handled for you.
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', () => {
return gulp.src('src/**/*.js')
.pipe(sourcemaps.init())
.pipe(babel({
presets: ['es2015']
}))
.pipe(concat('all.js'))
.pipe(sourcemaps.write('.'))
.pipe(gulp.dest('dist'));
});
Files in the stream are annotated with a babel
property, which contains the metadata from babel.transform()
.
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', () => {
return gulp.src('src/**/*.js')
.pipe(babel({
presets: ['es2015']
}))
.pipe(logFileHelpers());
})
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', () => {
return gulp.src('src/app.js')
.pipe(babel({
plugins: ['transform-runtime']
}))
.pipe(gulp.dest('dist'));
});
MIT © Sindre Sorhus