Use next generation JavaScript, today
npm install gulp-babel2> 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
`js
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'))
);
`
`js
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);
`
Use gulp-sourcemaps like this:
`js
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'))
);
`
Files in the stream are annotated with a babel property, which contains the metadata from babel.transform().
#### Example
`js
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())
)
`
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:
`js
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'))
);
``
MIT © Sindre Sorhus