Main.js config: Combine presets and register entries in addons field

[shilman]

Before: Presets are a “superset” of addons

• Addons are packages that extend Storybook’s UI (but not always, e.g. Storyshots). They sometimes use a mechanism called presets to configure storybook and/or register themselves (e.g. Docs)
• Presets are both packages that configure Storybook and also a mechanism by which addons can configure Storybook.

module.exports = {
  presets: [‘@storybook/addon-docs/preset’, { name: '@storybook/preset-create-react-app', options: {} }],
  addons: [‘some-addon-we-dont-own/register’, ...],
  ...
}

After: Addons are a “superset” of presets

• Addons are packages that extend Storybook in various ways (UI, binaries, libraries, configurations)
• Presets are THE mechanism by which addons configure Storybook, including registering themselves with Storybook.

module.exports = {
  addons: [
    ‘@storybook/addon-docs/preset’,
     { name: '@storybook/addon-create-react-app', options: {} }
    ‘some-addon-we-dont-own/register’,
    ...
  ],
}

[shilman]

Yee-haw!! I just released https://github.com/storybookjs/storybook/releases/tag/v5.3.0-rc.6 containing PR #9246 that references this issue. Upgrade today to try it out!

You can find this prerelease on the @next NPM tag.

Closing this issue. Please re-open if you think there's still more to do.