Create an enum with string values

Following code can be used to create an enum in TypeScript:

enum e {
    hello = 1,
    world = 2
};

And the values can be accessed by:

e.hello;
e.world;

How do I create an enum with string values?

enum e {
    hello = "hello", // error: cannot convert string to e
    world = "world"  // error 
};