Can't htmlmin after useref

[elado]

useref works great, htmlmin works great too, but one after another they cause an error:

  return gulp.src('.tmp/*.html')
    .pipe(assets)
    .pipe($.if('*.js', $.uglify()))
    .pipe($.if('*.css', $.csso()))
    .pipe(assets.restore())
    .pipe($.useref())
    .pipe($.htmlmin())
    .pipe(gulp.dest("dist"))
    .pipe($.size());

Error:

events.js:85
      throw er; // Unhandled 'error' event
            ^
Error: no writecb in Transform class
  at afterTransform (/app/node_modules/gulp-uglify/node_modules/through2/node_modules/readable-stream/lib/_stream_transform.js:95:33)
  at TransformState.afterTransform (/app/node_modules/gulp-uglify/node_modules/through2/node_modules/readable-stream/lib/_stream_transform.js:79:12)
  at /app/node_modules/gulp-uglify/index.js:70:12
  at minify (/app/node_modules/gulp-uglify/index.js:18:3)
  at DestroyableTransform.uglify [as _transform] (/app/node_modules/gulp-uglify/index.js:68:3)
  at DestroyableTransform.Transform._read (/app/node_modules/gulp-uglify/node_modules/through2/node_modules/readable-stream/lib/_stream_transform.js:184:10)
  at DestroyableTransform.Transform._write (/app/node_modules/gulp-uglify/node_modules/through2/node_modules/readable-stream/lib/_stream_transform.js:172:12)

[jonkemp]

You probably need to use gulp-if to only minify HTML files. Useref.assets puts the js and CSS files in the stream.

[jonkemp]

Although looking at your error logs, it looks like the problem is with uglify.

[shinnn]

I created the same gulpfile and tried to run it. It throws an error which is very similar to the one @elado ran into.

events.js:72
        throw er; // Unhandled 'error' event
              ^
Error: no writecb in Transform class

( ... )

And, after I updated the task to .pipe($.if('*.html', $.htmlmin())), it doesn't throw any errors.