TypeScript string-based enum compiler error

Question

I want to create a string-based enum to represent Currencies in my system (USD, GBP, EUR, etc - such strings as the only allowed values).

I found exactly what I need in Basarat's TypeScript book. The thing is, when I try to use it as-is:

type CardinalDirection =
    "North"
    | "East"
    | "South"
    | "West";

I get a compiler error:

myfile.ts(4,5): error TS1110: Type expected.

I'm using tsc Version 1.5.0-beta. The question is: which versions do support this feature and/or how can I make it work?

edit: after upgrading tsc to 1.8.9 I get the same error.

The following TypeScript example works just fine: jsfiddle.net/y8yz1hcm — Mr. Polywhirl
– Mr. Polywhirl, Commented Mar 22, 2016 at 16:13

JohnnyHK · Accepted Answer · 2016-03-22 16:08:07Z

2

String literal types were added in TypeScript 1.8.

Your code works fine in the TypeScript playground, so the syntax looks fine.

answered Mar 22, 2016 at 16:08

JohnnyHK

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1 Comment

forgot that my grunt-typescript plugin for grunt is using a lot older version of typescript :(