Example not working

[mikewheaton]

I'm having some trouble getting the example from the README to work. Here is what I have in gulpfile.js:

var gulp = require('gulp');
var choose = require('gulp-choose-files');

gulp.task('default', function() {
  return gulp.src('src/emails/**/*.html')
    .pipe(choose())
    .pipe(gulp.dest('dist/emails'));
});

When I run gulp I get the prompt to choose a file. But regardless of the file I choose there's an error:

(node:97106) UnhandledPromiseRejectionWarning: TypeError: Cannot read property 'relative' of undefined
    at DestroyableTransform.saveFile [as _transform] (/Users/mike/Microsoft/commenting-template/node_modules/vinyl-fs/lib/dest/index.js:36:49)
    at DestroyableTransform.Transform._read (/Users/mike/Microsoft/commenting-template/node_modules/vinyl-fs/node_modules/readable-stream/lib/_stream_transform.js:184
:10)
    at DestroyableTransform.Transform._write (/Users/mike/Microsoft/commenting-template/node_modules/vinyl-fs/node_modules/readable-stream/lib/_stream_transform.js:17
2:12)
    at doWrite (/Users/mike/Microsoft/commenting-template/node_modules/vinyl-fs/node_modules/readable-stream/lib/_stream_writable.js:237:10)
    at writeOrBuffer (/Users/mike/Microsoft/commenting-template/node_modules/vinyl-fs/node_modules/readable-stream/lib/_stream_writable.js:227:5)
    at DestroyableTransform.Writable.write (/Users/mike/Microsoft/commenting-template/node_modules/vinyl-fs/node_modules/readable-stream/lib/_stream_writable.js:194:1
1)
    at DestroyableTransform.ondata (/Users/mike/Microsoft/commenting-template/node_modules/readable-stream/lib/_stream_readable.js:619:20)    at emitOne (events.js:116:13)
    at DestroyableTransform.emit (events.js:211:7)
    at addChunk (/Users/mike/Microsoft/commenting-template/node_modules/readable-stream/lib/_stream_readable.js:291:12)
(node:97106) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block
, or by rejecting a promise which was not handled with .catch(). (rejection id: 1)
(node:97106) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.

Any idea what's going on here?

[jonschlinkert]

Hmm, what version of gulp are you using? Also, any info on other libs you're using, like vinyl or vinyl-fs would help.

My hunch is that the files are using an old version of vinyl. But I'm not sure yet.

[mikewheaton]

I've started a new project to be sure this issue is isolated.

Here's the file structure:

Contents of package.json:

{
  "name": "choose-files-test",
  "version": "1.0.0",
  "description": "",
  "main": "gulpfile.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "author": "",
  "license": "ISC",
  "dependencies": {
    "gulp": "^3.9.1",
    "gulp-choose-files": "^1.0.0"
  }
}

And contents of gulpfile.js:

var gulp = require('gulp');
var choose = require('gulp-choose-files');

gulp.task('default', function() {
  return gulp.src('source/**/*.txt')
    .pipe(choose())
    .pipe(gulp.dest('destination/'));
});

I've verified that I'm on the latest versions of Gulp (3.91), NPM (5.6.0), and Node (8.11.3). After running gulp and selecting one of the text files, I still have the UnhandledPromiseRejectionWarning error.

[mikewheaton]

I modified the script to log the selected files to the console:

var log = function(file) {
  console.log('File selected:', file);
};

gulp.task('default', function() {
  return gulp.src('source/**/*.txt')
    .pipe(choose())
    .pipe(map(log));
});

If I select two of the files, gulp-choose-files is returning them but as undefined:

? Which files do you want to write?
File selected: undefined
File selected: undefined

So that explains the Cannot read property error from earlier, as it was running on an undefined object. Any tips on how I can go about debugging this?