introduction-decorators-method-decorator-set-enumerable.ts

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

class User {
    name: string = 'Marcos';

    @enumerable(false)
    changePassword(newPassword: string) { }
}

const user = new User();

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

// name