How to solve this minification error on Gulp?

问题:

I'm getting below error running this command

gulp.task('minify', function () {
    return gulp
      .src('public/app/js/myapp.bundle.js')
      .pipe(uglify())
      .pipe(gulp.dest('public/app/js/myapp.bundle.min.js'));
});

GulpUglifyError: unable to minify JavaScript Caused by: SyntaxError: Unexpected token: name (MenuItem) (line: 1628, col: 18, pos: 53569)

Code on that location is this

 setters: [],
 execute: function () {
     class MenuItem {  // <-- line 1628

What's wrong?

回答1:

UglifyJS does not currently support EcmaScript 6 structures like classes.

You'll probably need to run your JavaScript through a transpiler step first, or find a minifier that knows what to do with ES6 code.

Update 2017-06-17

The branch of UglifyJS that is designed to work with ES6 is now published as uglify-es on npm.

Update 2018-09-10

'terser' is the new 'uglify-es'. 'uglify-es' is no longer maintained.

https://www.npmjs.com/package/gulp-terser

npm install gulp-terser --save-dev

const gulp = require('gulp');
const terser = require('gulp-terser');

function es(){
  return gulp.src('./src/index.js')
    .pipe(terser())
    .pipe(gulp.dest('./build'))
}

gulp.task('default', es);

回答2:

If you run into this problem and you have in fact a transpiler step like Babel, make sure that you include the proper Babel preset in you .babelrc file. Otherwise Babel will simply leave your code as is.

E.g.

{
  "presets": ["es2015"]
}