Gulp series does not update things unless the last task is run

Hi! I do not know if it is a bug, however I cannot find any information bout this behavior in the docs and it might be a bug, namely, I’ve got such gulp tasks:

gulp.task 'incVersionDev', (done) ->
  gulp.src './package.json'
    .pipe transform 'utf8', incVersionDev
    .pipe gulp.dest('.')
  done()

gulp.task 'publish' , gulp.series 'build', 'incVersionDev', 'copy_package_config', (done) ->
  # execSync 'cat ./package.json', {stdio:'inherit'}
  execSync 'cd lib && npm publish', {stdio:'inherit'}
  done()

when I run gulp publish I got npm error that I cannot publish the same version twice. What happens is that incVersionDev runs but it do not writes package.json unless are series tasks are run. If I uncomment echo of package.json I can clearly see it was not changed. However if I comment the line execSync 'cd lib && npm publish', {stdio:'inherit'}, everything works - the version is incremented.

It seems like gulp is not making changes to files when running series until series is finished - if that is the case, is it the behavior we want? If so, is there any way to accomplish what I want to do here?

gulp version: next npm version: 5.5.1

[phated]

@wdanilo you’ve fixed your stream issue (of course, you’re relying on implicit returns). For your other issue: this is not a support forum. Support questions should be directed to StackOverflow, but you might want to look into your usage of npx inside the publish script.

[wdanilo]

Thank you!