Extending Enums.

[guptaamol]

Search Terms

enums

Suggestion

I was hoping if there was a way to extends enums. Like in the example.

Use Cases

It would be really helpful for code reuse. And reduce errors.
I am not able to get this functionality, it would be really helpful if there exists a workaround for the same.

Examples

http://www.typescriptlang.org/play/#src=enum%20someEnum%20%7B%0D%0A%20%20%20%20a%20%3D%20'Some%20String'%2C%0D%0A%20%20%20%20b%20%3D%202%2C%0D%0A%7D%3B%0D%0A%0D%0Aenum%20extendedEnum%20%7B%0D%0A%20%20%20%20c%20%3D%20'string'%2C%0D%0A%20%20%20%20b%20%3D%20someEnum.b%20%2F%2F%20Gives%20Error%0D%0A%7D%0D%0A%0D%0Atype%20someEnumType%3CT%20extends%20someEnum%3E%20%3D%20T%20extends%20someEnum.a%20%3F%20string%20%3A%0D%0A%20%20%20%20T%20extends%20someEnum.b%20%3F%20number%20%3A%20never%3B%0D%0A%0D%0Atype%20extendedEnumType%3CT%20extends%20extendedEnum%3E%20%3D%0D%0A%20%20%20%20T%20extends%20extendedEnum.c%20%3F%20string%3A%20%20%20%20%20%20%20%20%20%20%2F%2F%20Gives%20Error%0D%0A%20%20%20%20T%20extends%20extendedEnum.b%20%3F%20number%20%3A%20never%3B%20%20%2F%2F%20Gives%20Error

Checklist

My suggestion meets these guidelines:

• This wouldn't be a breaking change in existing TypeScript / JavaScript code
• This wouldn't change the runtime behavior of existing JavaScript code
• This could be implemented without emitting different JS based on the types of the expressions
• This isn't a runtime feature (e.g. new expression-level syntax)

[jack-williams]

Related or duplicate: #17592

[weswigham]

Yeah, duplicate of #17592. Continue discussion there, if you so desire.

[guptaamol]

Thanks mate. Appreciate it.

…

On Thu, Oct 18, 2018 at 4:15 AM Wesley Wigham ***@***.***> wrote: Yeah, duplicate of #17592 <#17592> — You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub <#27947 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AVMSFcWZRlcrX7IJ7cHSmyZ_2sI6Vw9Uks5ul7L3gaJpZM4Xk_sD> .