Gulp4 watch only triggers once on Linux

[martinstuecklschwaiger]

What were you expecting to happen?

gulp.watch() should trigger on each file change.

What actually happened?

It only triggers for the first file change and then not anymore.
This happens on my Linux machine, but not with my colleague who uses Window.
Note: This is not because we forgot about the done callback.

> gulp singleFile 
[15:49:44] Using gulpfile ~/builder/workspace/walls.io/gulpfile.js
[15:49:44] Starting 'singleFile'...
... now I change file.js ...
[15:49:53] Starting 'runSingleFileWatcher'...
[15:49:53] Finished 'runSingleFileWatcher' after 838 μs
... I change file.js again, but nothing happens …

> gulp multipleFiles 
[15:50:51] Using gulpfile ~/builder/workspace/walls.io/gulpfile.js
[15:50:51] Starting 'multipleFiles'...
... now I change file.js ...
[15:50:55] Starting 'runMultipleFilesWatcher'...
[15:50:55] Finished 'runMultipleFilesWatcher' after 1.59 ms
... now I change file.js again ...
[15:50:57] Starting 'runMultipleFilesWatcher'...
[15:50:57] Finished 'runMultipleFilesWatcher' after 254 μs
... now I change file.js again ...
[15:50:59] Starting 'runMultipleFilesWatcher'...
[15:50:59] Finished 'runMultipleFilesWatcher' after 543 μs
... now I change file.js again ...
[15:51:01] Starting 'runMultipleFilesWatcher'...
[15:51:01] Finished 'runMultipleFilesWatcher' after 590 μs

Workarounds

• Using a wildcard in the filepath (see exports.multipleFiles)
• If I use {usePolling: true} it works

const gulp = require( 'gulp' );

// This will only trigger for the first file change
exports.singleFile = () => {
  gulp.watch("file.js", function runSingleFileWatcher(done) {
    done();
  });
};

// This works as expected
exports.multipleFiles = () => {
  gulp.watch("file.js*", function runMultipleFilesWatcher(done) {
    done();
  });
};

What version of gulp are you using?
CLI version: 2.2.0
Local version: 4.0.0

What versions of npm and node are you using?
Node: v8.11.4
Npm: 5.6.0
Running on Linux / Ubuntu 18.04.2 LTS

[phated]

It's likely a chokidar issue but I don't think they care to work on the older version anymore. You'll probably have to use one of your workarounds 😭

[specious]

I just discovered this issue (Arch Linux, F2FS file system).

Here's the discussion: paulmillr/chokidar#237

Using chokidar 3.x solves the problem.