How to add an enum in class in Typescript

What ever you are trying to do is not possible in TypeScript. As per my understanding, you need a data member of type Status enum. You can update your code this way

enum Status {
    Value1,
    Value2
};

export class User {
    userID: number;
    nom: string;
    prenom: string;
    dateCretation: Date;
    status: Status; // can hold either Value1 or Value2 from Status enum
}

You will need to declare the enum beforehand, and then type it to the properties that you want to have of that type:

export enum Values {
  Value1,
  Value2
}

export class User {
  userID: number;
  nom: string;
  prenom: string;
  dateCretation: Date;
  statut: Values
}

Another alternative is that if you know for sure that statut can only strictly take in two values, of which they are type of, say, string, then you can do like the following:

export class User {
  userID: number;
  nom: string;
  prenom: string;
  dateCretation: Date;
  statut: "Value1" | "Value2"
}