Utilize decorators for enhancing interface properties with metadata information

Can decorators be utilized to add custom information to specific properties within an interface?

An example can help clarify this:

Interface for App state:

export interface AppState {
    @persist userData: UserData,
    @persist selectedCompany: UserCompany,

    // userCompanies should not be persisted since they are always
    // fetched afresh from the server...
    userCompanies: UserCompany[]
}

Function for persisting relevant state information:

persistState(state) {
    let newState = {};

    Object.keys(state).forEach((key) => {
        if (state[key] is marked with @persist) {
            newState[key] = state[key];
        }
    });

    // Persist newState...
}

Is it feasible to achieve this using decorators?
Any guidance or resources on how to implement this would be greatly appreciated!
If it's not possible, are there any other elegant solutions available?

Answer №1

Can decorators be used to add custom information to properties within an interface?

Unfortunately, no. Decorators are unable to be applied to interfaces as they operate on runtime entities, while interfaces are essentially erased during compilation.

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