fix(scripts): reduce watcher updates and fix small path bug

[dannyhw]

Issue: NA

What I did

I've made the watcher only update requires when stories are added or removed or the main/preview.js was updated.

I also made an adjustment to how the paths work in the get-stories script.

How to test

Run the sbn-watcher and sbn-get-stories scripts in the example project.

[lauriharpf]

Seems to work well 👍 🚀 🏅 .

Here's how I understand the different operations related to updates, please correct if mistaken:

• yarn dev in root React Native Storybook project directory: Causes any changes made to the core React Native Storybook files to be reflected in the example app
• yarn start in the examples/native directory: Needs to be running before running yarn android/yarn ios. When the app is running, changes to existing stories cause a reload & are reflected. New stories do not get added (storybook.requires.js only gets written when the app starts, because prestart runs sbn-get-stories).
• yarn storybook-watcher in the examples/native directory: If this is running, then adding/removing stories causes storybook.requires.js to be updated, so adding/removing stories is reflected in the app without a restart.

[dannyhw]

Seems to work well 👍 🚀 🏅 .

Here's how I understand the different operations related to updates, please correct if mistaken:

• yarn dev in root React Native Storybook project directory: Causes any changes made to the core React Native Storybook files to be reflected in the example app
• yarn start in the examples/native directory: Needs to be running before running yarn android/yarn ios. When the app is running, changes to existing stories cause a reload & are reflected. New stories do not get added (storybook.requires.js only gets written when the app starts, because prestart runs sbn-get-stories).
• yarn storybook-watcher in the examples/native directory: If this is running, then adding/removing stories causes storybook.requires.js to be updated, so adding/removing stories is reflected in the app without a restart.

Yeah that's exactly it, the watcher just makes it so you don't need to manually run sbn-get-stories after adding a new story its mostly a convenience thing. I'm sure some people would prefer to just run the get stories command instead of having a watcher running.