Package Exports
- gulp-babel
This package does not declare an exports field, so the exports above have been automatically detected and optimized by JSPM instead. If any package subpath is missing, it is recommended to post an issue to the original package (gulp-babel) to support the "exports" field. If that is not possible, create a JSPM override to customize the exports field for this package.
Readme
gulp-babel 
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/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(logBabelMetadta())
)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-runtimeUse 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