This pull request refactors how type references are managed in the ContentType module, moving from an array-based approach to a Map for better extensibility and safety. It also introduces a new utility function to allow dynamic registration of type references, and updates related exports accordingly.

Refactoring and extensibility improvements:

• Replaced the typeRefs array with a Map for storing type reference IDs and their corresponding read functions, improving lookup efficiency and allowing dynamic registration.
• Added the registerTypeRef function to enable safe, dynamic registration of new type reference handlers, throwing an error if a duplicate ref is registered.
• Updated the readContentType function to use the new Map structure, with error handling for unknown type references.

Export changes:

• Exported the new registerTypeRef function from src/index.js to make it available for use elsewhere in the codebase.

Cleanup:

• Removed the old array-based typeRefs declaration and initialization.

import * as Y from 'yjs'
import { readYArrayLike, YArrayLike } from './YArrayLike'

Y.registerTypeRef(1000, readYArrayLike)