Firestore increment field

const userRef = db.collection('documents').doc('document_id');
const increment = firebase.firestore.FieldValue.increment(1);

userRef.update({ FieldToIncrease: increment });

Firestore decrement field

const userRef = db.collection('documents').doc('document_id');
const decrement = firebase.firestore.FieldValue.increment(-1);

userRef.update({ fieldToDecrease: decrement });

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