9.0.6 breaks my gulp + watchify setup

@Gulpfile.js

var gulp       = require('gulp');
var gutil      = require('gulp-util');
var transform  = require('vinyl-transform');
var debug      = require('gulp-debug');
var browserify = require('browserify');
var watchify   = require('watchify');
var reactify   = require('reactify');
var _          = require('underscore');

var paths = {
  src:  './www/src/',
  dist: './www/dist/'
};

var b = browserify(paths.src + 'js/', _.extend(watchify.args, {debug: true}));
var bundler = watchify(b)
  .transform(reactify)
  .on('update', bundle)
  .on('log', console.error);

console.log(watchify.args);

function bundle() {
  var bundle = transform(function(filename) {
    return bundler.bundle();
  });
  return gulp.src([paths.src + 'js/index.js'])
    .pipe(debug({title: 'bundle'}))
    .pipe(bundle)
    .on('error', gutil.log.bind(gutil, 'Browserify Error'))
    .pipe(gulp.dest(paths.dist));
}

gulp.task('browserify', bundle);

Upgrading to 9.0.6 results in the following error:

_stream_readable.js:540
    var ret = dest.write(chunk);
                   ^
TypeError: undefined is not a function
    at Producer.ondata (_stream_readable.js:540:20)
    at Producer.emit (events.js:107:17)
    at Producer.Readable.read (_stream_readable.js:373:10)
    at flow (_stream_readable.js:750:26)
    at resume_ (_stream_readable.js:730:3)
    at _stream_readable.js:717:7
    at process._tickCallback (node.js:355:11)

9.0.4 works fine

[thepian]

Am I reading this wrong? It seems the objective is to produce multiple bundles and your fix is to make a single bundle.

[terinjokes]

b.bundle() has always been documented* as returning a readable stream. From version to version, sometimes a duplex stream would be returned as an implementation detail, but writing to it was always undefined behavior.

If you must use gulp for this task, use vinyl-source-stream instead of vinyl-transform.

var browserify = require('browserify'),
    gulp       = require('gulp'),
    source     = require('vinyl-source-stream'),
    buffer     = require('vinyl-buffer'),
    uglify     = require('gulp-uglify');

gulp.task('default', function () {
    return browserify([__dirname + '/lib/browserified.js']).bundle()
        .pipe(source('app.js'))
        .pipe(buffer())
        .pipe(uglify())
        .pipe(gulp.dest(__dirname + '/cache'));
});

---

*Effectively always, starting with version 2.