Static stories.json refinements

[shilman]

Follow-up to #14945

Current limitations

• Many cases not statically analyzable or not yet implemented
  • const meta = ...; export default meta;
  • const Story = ...; export { Story };
• Template.bind({}) not yet implemented
• MDX not yet implemented
• Better error handling, e.g. export default { title: 14 }
• Fix promise handling to make sure stories.json is finished generating e.g. in build-storybook
• Make fileName relative to configDir

Maintenance

• Use common type system

[shilman]

We’re cleaning house! Storybook has changed a lot since this issue was created and we don’t know if it’s still valid. Please open a new issue referencing this one if this is still relevant in SB 7.x.