Given existing enum HttpMethod, when you want to replace existing value "POST" with e.g. "post", you change enum's value and

With or without enums in TypeScript

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2024-04-25 23:00:03

Given existing enum HttpMethod, when you want to replace existing value "POST" with e.g. "post", you change enum's value and you're done!

If you're not familiar with Opaque types, it's a way to declare types of the same structure, which are not assignable to each other.

The perfect example can be 2 currencies (e.g. USD and EUR). You cannot simply put dollars into euro account without taking into account currency exchange rate:

Please check the playground to test it for TypeScript 4.9.5 - https://www.typescriptlang.org/play?preserveConstEnums=true&ts=4.9.5#code/KYOwrgtgBA8mAuAHBUDeAoKWoFEBOeA9nlALxQCMANJtgOoCGeIAliAOZlQBMN2UAGUKdyAZhoBfdOjbxgeAGYMAxsFiJ4LQiADOaWlkIJk8APwAuWMYQBudFPTLtO+FEIatuyzA-OuqCTt3TWcAOiMkFHI4SPhQ-CI8IN9dcOtXaPTQxmY2dmSQ1IiTLhiTUKF86QB6ard3HSooACMUFxYAGw6oHQYFYHRgzx002K5RO3RaqABCOdgYAAUAZVn5sF0+tUBeDcBQPcGUkeKoqAAWAuHRkvIAVhsgA 🏝️

Beginning with TypeScript 5.0, this issue has been resolved and addressed within the release, eliminating it as a concern going forward. For more details, please read TypeScript 5.0 Release | Enum Overhaul.