Returns undefined RealmJS on React Native?

Question

Android

Hello. Now I'm developing an Android application, using React Native, using Realm for data storage.

For convenience, I created a class that should work with a certain data type in Realm, and there I created a method to get all the data from the Database, here it is:

getFiles = () => {
    Realm.open({schema: [this.file]})
    .then( realm => {
        let file = realm.objects('file')
        realm.close();
        return file
    }).catch(error => {
        console.log(error);
    })
}

Then I call this method and put the value in a variable:

let filesRealm = RealmFile.files;
console.log(filesRealm)

But when I print the value of the variable to the console, it prints undefined. Tell me how to fix this?