When building scalable systems, we often need a collection of classes to expose a fixed, read-only configuration value. Whether it is a unique API_ENDPOINT, a DATABASE_TABLE name, or a specific PERMISSIONS_MASK, handling constants across a series of classes looks simple on day one but can quickly turn into an architectural nightmare.
Setting the Foundation: How to Make It
In modern object-oriented programming, the standard way to declare a constant on a class is by leveraging the static readonly modifiers. This ensures the attribute belongs to the class itself, rather than an instance, and cannot be mutated at runtime.
TypeScript
class BillingService {
