to/from enum converter in TypeScript using generics

enum.ts

enum Status {
  Pending,
  PaymentReceived,
  Shipped
}

class EnumConverter<E> {
  toEnum(orig : string) : E {
    return this.enumMap()[orig];
  }

  fromEnum(enumVal : E) : string {
    var map = this.enumMap(),
        val;

    for(var k in map) {
      val = map[k];
      if (val == enumVal) return k;
    }

    throw("SHIT");
  }

  enumMap() : {[k: string] : E} {
    throw "Abstract, ya dingus!"
  }
}

class StatusConverter extends EnumConverter<Status> {
  enumMap() { 
    return {
      "Pending":          Status.Pending,
      "Payment Received": Status.PaymentReceived,
      "Shipped":          Status.Pending
    };
  }
}

var converter = new StatusConverter();

console.log(converter.fromEnum(converter.toEnum("Payment Received")));

+1 for exception message.

Also, enumMap's "shipped" is mapped to Status.Pending, rather than Status.Shipped. Just sayin'.