Catching and handling Uglify errors when using Gulp

Question

My Gulp setup is otherwise working fantastically, but it stops if there's an error with my JS files. Until Gulp 4 is finally released, we're all stuck using the less than perfect error system in Gulp... So how can I catch Uglify's errors?

gulp.task('js', function() {
    return gulp
        .src(inputJS)
        .pipe(sourcemaps.init())
        .pipe(concat('main.js'))
        .pipe(uglify(uglifyOptions))
        .pipe(sourcemaps.write('./maps'))
        .pipe(gulp.dest(outputJS))
});

According to the Uglify documentation, gulp-uglify emits an 'error' event if it is unable to minify a specific file. Wherever possible, the PluginError object will contain the following properties: fileName, lineNumber, message.

The closest I've gotten it to working is: .on('error', function(uglify) { console.error(uglify.message) })), but it ends up with the above Gulp task ceasing to do any more.

Edit: I realise that there's a number of Gulp extensions that help when dealing with error handling (eg. Gulp-Util, Stream-Combiner2, Gulp-Plumber, etc.) but I don't wish to install a whole new extension just for Uglify (I'm handling my Sass errors just fine without one).

Answer 1

It seems the solution was very simple:

    .pipe(uglify(uglifyOptions).on('error', function(uglify) {
        console.error(uglify.message);
        this.emit('end');
    }))

Almost exactly what Jeffwa suggested, but no need for gulp-plumber. The reason my attempt was stopping is because Gulp watch tasks wait until they receive end (see: https://github.com/gulpjs/gulp/issues/259).