Gulp 4.0 branch is incompatible with imagemin-mozjpeg and gulp-changed/gulp-newer

[noderat]

It appears that the mtime of files passed through mozjpeg is not updated, so gulp-changed (or gulp-newer) can't detect if there are newer files.

[shinnn]

Can you show us your gulpfile?

[noderat]

Here's a snippet:

gulp.task(function mozjpeg() {
  var mozjpeg = require('imagemin-mozjpeg');
  return gulp.src(path.join(config.src, '**/*.{jpg,jpeg}'))
    .pipe(changed(config.dest))
    .pipe(mozjpeg(config.mozjpeg.options)())
    .pipe(debug({title: 'mozjpeg:'}))
    .pipe(gulp.dest(config.dest));
  });

[noderat]

So I checked mtime/atime between imagemin-mozjpeg and a plugin that was working (ttf2woff) and it appears that neither updates the mtime, but ttf2woff is updating the atime. Now I'm confused.

[shinnn]

I guess this issue is not directly related to this plugin. However, if you create a small repository by which we can reproduce the problem, I'll check it when I have a time.

[noderat]

So after doing some testing I was able to determine that this is caused by using the gulp 4.0 branch. Is there some option in gulpjs/gulp#4.0 that I'm missing?

[shinnn]

Hmm, I haven't try gulp 4 yet and probably gulp team can help you better. https://github.com/gulpjs/gulp/issues Hope you find the root cause.