types - Typescript enums with parameters -

i'd have strictly typed mutable objects, haxe enums.

in haxe, can do

enum color {   red;   rgb(r:int, g:int, b:int);   rgba(r:int, g:int, b:int, a:int); } 

i'd able access a parameter if object rgba, , can't access parameters if object red.

i don't care if use enum keyword or not in typescript.

is there way achieve in typescript ?

as of version 2.0, typescript supports tagged unions extent. general syntax is

type mytype = | b | c …; 

where a, b , c interfaces. mytype object can of types, , no other. announcement gives quick example:

interface square {     kind: "square";     size: number; }  interface rectangle {     kind: "rectangle";     width: number;     height: number; }  interface circle {     kind: "circle";     radius: number; }  type shape = square | rectangle | circle;  function area(s: shape) {     // in following switch statement, type of s narrowed in each case clause     // according value of discriminant property, allowing other properties     // of variant accessed without type assertion.     switch (s.kind) {         case "square": return s.size * s.size;         case "rectangle": return s.width * s.height;         case "circle": return math.pi * s.radius * s.radius;     } } 

however, type safety if these union types needs guarded , checked manually so-called “discriminant property type guard” example shows (checking s.kind).