Added

• Fallback memory storage improvement for environments without localStorage or sessionStorage
• TypeScript support with improved type inference (<T> generic return)
• CONTRIBUTING.md file for contributors
• Linting and formatting scripts (eslint, prettier)
• New tests for edge cases, expiration logic, and nested data manipulation

Changed

• Improved session expiration handling and internal cleanup logic
• Restructured test suite for better clarity and separation of concerns
• Updated internal storage handler for stricter key path evaluation

Removed

• Dropped unnecessary or unreliable timer-based tests in favor of real browser behavior

This release improves type safety, Node.js support, and maintainability. Great for both browser and server-side use cases.