What is 'Global Augmentation' and when should it be used?

Global augmentation allows you to add declarations to the global scope or extend existing modules from within a separate file.

By using the declare global block, you can add new properties to global objects like Window, ProcessEnv, or Array. This is often necessary when using polyfills or when a library attaches objects to the global namespace. It ensures that the TypeScript compiler recognizes these additions across the entire project without needing manual casting.