javascript - Gulp plumber cannot pipe to undefined

Question

I am trying, to write a module that when gulp is watching a task, and a Less file changed with some error, it should give a message to the console, but it should not crash the system, which it does no: This is the code I have written:

var onError = function (err) {  
  console.log(err);
};

gulp.task('styles', function () {  
   gulp.src('./{views}/**/*.{less}')
     .pipe(plumber({
       errorHandler: onError
     }))
     .pipe(less())
     .pipe(gulp.dest('build/styles/common.css'));
 });

When I run the above code, I get the error below:

'styles' errored after 20 ms
Error in plugin 'plumber'
Message:
    Can't pipe to undefined

Answer 1

I have had the same error. I resolved it by adding () after the plumber. Here is the code.

Earlier Code:

gulp.task('scripts',function(){
gulp.src('admin-scripts.js')
    .pipe(plumber)
    .pipe(uglify().on('error', function(e){
        console.log(e);
    }))
    .pipe(gulp.dest('build/js'));

});

Fixed Code:

gulp.task('scripts',function(){
gulp.src('admin-scripts.js')
    .pipe(plumber())
    .pipe(uglify().on('error', function(e){
        console.log(e);
    }))
    .pipe(gulp.dest('build/js'));

});

I was missing the () after plumber. Hope this helps.

Answer 2

Are you sure to have installed gulp-less using

npm install --save-dev

and referencing it in your gulpfile with

var less = require('gulp-less');

This error from plumber occurs when the destination of your pipe (here your less) is undefined.

Also why are you using the {} here ? They are a bit useless I think since you're targetting only one thing in it, you could remove them.

Answer 3

Yes I have installed gulp-less, and I figured out the solution for this problem aswell: It should be as follow:

  gulp.task('mystyle', function () {  
    gulp.src('build/stylesfiles.less').pipe(plumber()).pipe(less()).
    pipe(gulp.dest ('build/styles/assets'));
    });

Basically I do not need the Error message, it will give me a default error, which can get my job done.Using the above code will make sure it runs, and gives me my error, but not crash the server....but thank you "Apercu"