del.sync() returns error but promisified del() does not

[rogierschouten]

del.sync() returns error but promisified del() does not

[rogierschouten]

OK this is weird. Some data points on this issue:

var del = require("del");
var gulp = require("gulp");

gulp.task("clean", function() {
    return del([    "some_glob_leading_to_error"]);
});

No errors are printed, process stops. However, check this:

var del = require("del");
var gulp = require("gulp");
var util = require("util");

gulp.task("clean", function() {
    return del([    "some_glob_leading_to_error"]);
});

process.on("exit", function(exitcode) {
   console.log(util.inspect(gulp.tasks["clean"]));
});

This prints:

{ fn: [Function],
  dep: [ 'document_clean' ],
  name: 'clean',
  args:
   { task: 'clean',
     message: 'clean promise',
     duration: 5.95151387,
     hrDuration: [ 5, 951513870 ],
     err:
      { [Error: EBUSY: resource busy or locked, rmdir 'C:\some_dir']
        errno: -4082,
        code: 'EBUSY',
        syscall: 'rmdir',
        path: 'C:\\some_dir' } },
  running: false,
  duration: 5.95151387,
  hrDuration: [ 5, 951513870 ],
  done: true }

So, gulp apparently does get the error and doesn't print it. Time for some generic tests with promises:

var gulp = require("gulp");
var Promise = require("bluebird");

gulp.task("clean", function() {
    return Promise.reject(new Error("foo"));
});

Gulp nicely prints the error "foo".

This is with gulp 3.9.1.

So gulp can handle promises and del returns an error and somehow it doesn't work together.

[SamVerschueren]

And does it do something with a catch function? It should be the same though, but you never know.

[sholladay]

What happens if you use Gulp 4? npm install gulpjs/gulp#4.0

How it orchestrates tasks under the hood is completely different. And it's very stable, I have been using it a lot for the past 6 months without any hiccups.