- Introduced Subject class for managing state and notifying listeners
- Added ReadOnlySubject class to provide read-only access to Subject values
- Created assertUnreachable utility function for unreachable code handling
- Updated observables index file to export Subject and ReadOnlySubject
- Created a new .npmrc file with custom settings for package-lock and registry
- Updated package.json to include new devDependencies for @types/express and @types/morgan
- Restored private status and scripts section in package.json, ensuring proper project setup
- Introduced IDisposable interface for defining disposable behavior
- Implemented Disposable class for single disposable resources
- Created DisposableList class to manage multiple disposables
- Updated index file to export the new classes and interface
