Move webpack to peer dependencies

[sheerun]

This makes it possible to use react-storybook with webpack 2.

For now storybook will pass configuration from .storybook/webpack.config.js to webpack 1 even parent project specified webpack 2 as dependency. This makes storybook to re-use webpack version from parent project instead of introducing its own.

It really works, I've tested it on my own project.

[Zalastax]

The changes work for me as well. I just had to provide my own webpack config: https://github.com/Zalastax/openschedule/blob/master/.storybook/webpack.config.js

[arunoda]

We can't make this a peer dep because, webpack doesn't installed by default with CRA.
But after the webpack 2 official release, we should try to do something.

[Zalastax]

Can't you just change the installation instructions/getstorybook? I've seen a lot of libraries do that.

[sheerun]

If anyone wants these changes right now, you can try @sheerun/storybook

@arunoda Then maybe change require call to discover webpack dependency of parent package, if it exists?

[arunoda]

@Zalastax that's also a good idea to do that on the getstorybook side.
So, we could try to add webpack as an dependency if there's not.

[jquense]

can we at least increase the range on the webpack direct dep? at least then deduping would allow this to work

[arunoda]

@jquense yep. That's something we could do now.
Could you send me a PR?

[cogell]

just a heads up:

• you're gunna need to drop: https://github.com/storybooks/react-storybook/blob/master/src/server/config/webpack.config.js#L58

• and drop the empty quote from this: https://github.com/storybooks/react-storybook/blob/master/src/server/config/webpack.config.js#L55

[ndelangen]

Thank you all, I hope we can do this fairly soon. I resolved the merge conflict, but this needs a very thorough review.

[ndelangen]

Very similar to this #637

Thank you @sheerun for contributing, simply moving webpack to peerDependencies and allowing any version does not solve the problem we have with supporting webpack 2.

Good news is it IS now also under consideration here:
https://github.com/storybooks/mono/pull/4

I need to do a great deal of testing on this.

[ndelangen]

So don't feel bad or like this isn't going to happen, because it's likely going to happen SOON!

I'm closing these PR because they will not be merged, because I'm doing them all in 1 swoop.