In firebase, I have a string field and I want to use batch writes to either delete this field or set it to null. I tried the code below but nothing happend.

import { firestore } from 'firebase-admin';

...
try {
    const batch = firestore.batch();

    batch.update(docRef, {
        myField: firestore.FieldValue.delete(),
    });

    await batch.commit();
} catch (error) {
    clog.error({ error }, `Failed to abort A/B test`);
    throw new Error(error);
}
...

I tried to replace firestore.FieldValue.delete() by null and it didn’t work either.

I tried to replace it by 'aaa' and it worked and set myField to aaa.