introduction-decorators-accessor-decorator-simple-example.ts

function enumerable(newValue: boolean) {
    return (
        target: any,
        propertyKey: string,
        propertyDescriptor: PropertyDescriptor,
    ) => {
        propertyDescriptor.enumerable = newValue;
    }
}
class User {
    _name: string;

    constructor(name: string) {
        this._name = name;
    }

    @enumerable(true)
    get name() {
        return this._name;
    }
}

const user = new User('Marcos');

for (let key in user) {
    console.log(key);
}

// _name
// name