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Class DocumentChange (7.11.0) | Node.js client library

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A DocumentChange represents a change to the documents matching a query. It contains the document affected and the type of change that occurred.

DocumentChange

constructor(type: DocumentChangeType, document: QueryDocumentSnapshot<AppModelType, DbModelType>, oldIndex: number, newIndex: number);

Constructs a new instance of the DocumentChange class

'added' | 'removed' | 'modified'.

The document.

The index in the documents array prior to this change.

The index in the documents array after this change.

get doc(): QueryDocumentSnapshot<AppModelType, DbModelType>;

The document affected by this change.

{QueryDocumentSnapshot} DocumentChange#doc

let query = firestore.collection('col').where('foo', '==', 'bar');

let unsubscribe = query.onSnapshot(querySnapshot => {
  for (let change of querySnapshot.docChanges) {
    console.log(change.doc.data());
  }
});

// Remove this listener.
unsubscribe();

The index of the changed document in the result set immediately after this DocumentChange (i.e. supposing that all prior DocumentChange objects and the current DocumentChange object have been applied). Is -1 for 'removed' events.

{number} DocumentChange#newIndex

let query = firestore.collection('col').where('foo', '==', 'bar');
let docsArray = [];

let unsubscribe = query.onSnapshot(querySnapshot => {
  for (let change of querySnapshot.docChanges) {
    if (change.oldIndex !== -1) {
      docsArray.splice(change.oldIndex, 1);
    }
    if (change.newIndex !== -1) {
      docsArray.splice(change.newIndex, 0, change.doc);
    }
  }
});

// Remove this listener.
unsubscribe();

The index of the changed document in the result set immediately prior to this DocumentChange (i.e. supposing that all prior DocumentChange objects have been applied). Is -1 for 'added' events.

{number} DocumentChange#oldIndex

let query = firestore.collection('col').where('foo', '==', 'bar');
let docsArray = [];

let unsubscribe = query.onSnapshot(querySnapshot => {
  for (let change of querySnapshot.docChanges) {
    if (change.oldIndex !== -1) {
      docsArray.splice(change.oldIndex, 1);
    }
    if (change.newIndex !== -1) {
      docsArray.splice(change.newIndex, 0, change.doc);
    }
  }
});

// Remove this listener.
unsubscribe();

get type(): DocumentChangeType;

The type of change ('added', 'modified', or 'removed').

{string} DocumentChange#type

let query = firestore.collection('col').where('foo', '==', 'bar');
let docsArray = [];

let unsubscribe = query.onSnapshot(querySnapshot => {
  for (let change of querySnapshot.docChanges) {
    console.log(`Type of change is ${change.type}`);
  }
});

// Remove this listener.
unsubscribe();

isEqual(other: firestore.DocumentChange<AppModelType, DbModelType>): boolean;

Returns true if the data in this DocumentChange is equal to the provided value.

The value to compare against. true if this DocumentChange is equal to the provided value.

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Last updated 2025-08-07 UTC.

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