Gulp 4 gives "The following tasks did not complete... Did you forget to signal async completion". How to fix it?

Question

JavaScript

Hi all !
gulpfile.js:

const gulp = require('gulp'),
      gp = require('gulp-load-plugins')(); 


gulp.task('img:compress', gulp.series( function(cb)  {
  return gulp.src('img/*')
    .pipe(gp.tinypng('RJnL6Rx3l41Y58OJziMBRUeoteR09LBb'))
    .pipe(gulp.dest('compressed_img/'))
 	cb(); 
}));

In the console gives:

[19:11:08] The following tasks did not complete: img:compress, <anonymous>
[19:11:08] Did you forget to signal async completion?

What could be the reason?
How can I change the code so that this message does not pop up in the console anymore?

Answer 1

You have a call cb()after returni.e. it is not called at all. But since it is in the list of arguments, gulp is waiting for its call and, without waiting, swears.
In your case, cbit is not needed at all, just remove it from the list of arguments and everything will start working.

Answer 2

gulp.task('img:compress', function  {
  return gulp.src('img/*')
    .pipe(gp.tinypng('RJnL6Rx3l41Y58OJziMBRUeoteR09LBb'))
    .pipe(gulp.dest('compressed_img/');
});