add handlebarsHelpers

[lcxfs1991]

No description provided.

[lcxfs1991]

FYI：
https://github.com/twolfson/gulp.spritesmith
Option: cssHandlebarsHelpers

[lcxfs1991]

Hi @mixtur What do you think of this feature?

In addition, would you also nominate more people to become collaborators?

[lcxfs1991]

hi what do you think of this feature?

[lcxfs1991]

TAT @mixtur still busy?

[mixtur]

Sorry, I have pretty much no excuse to answer this late(
handlebarsHelpers seems like a good idea. Your code also seems fine. I'll test it locally for a bit and then probably will merge it.
About collaborators - yep why not. Especially given that I do not have much time myself and not actually using the plugin in my own projects. I am not sure how to pick the right people though.

[lcxfs1991]

Thank you for answering. Hopefully you can open an issue or ask webpack community for help. Then you may recruit a suitable guy to operate this project together.

[mixtur]

Published in 0.4.0 though note that in case of multiple instances of plugin, helpers will be shared.