CollectionReference object can be used for adding documents, getting
document references, and querying for documents (using the methods
DocumentChange represents a change to the documents matching a query.
It contains the document affected and the type of change that occurred.
DocumentReference refers to a document location in a Firestore database
and can be used to write, read, or listen to the location. The document at
the referenced location may or may not exist. A
also be used to create a
CollectionReference to a subcollection.
DocumentSnapshot contains data read from a document in your Firestore
database. The data can be extracted with
get a specific field.
DocumentSnapshot that points to a non-existing document, any data
access will return 'undefined'. You can use the
exists property to
explicitly verify a document's existence.
A FieldPath refers to a field in a document. The path may consist of a single field name (referring to a top-level field in the document), or a list of field names (referring to a nested field in the document).
Create a FieldPath by providing field names. If more than one field name is provided, the path will point to a nested field in a document.
The Cloud Firestore service interface.
Do not call this constructor directly. Instead, use
An immutable object representing a geo point in Firestore. The geo point is represented as latitude/longitude pair.
Latitude values are in the range of [-90, 90]. Longitude values are in the range of [-180, 180].
Query refers to a Query which you can read or listen to. You can also
Query objects by adding filters and ordering.
QueryDocumentSnapshot contains data read from a document in your
Firestore database as part of a query. The document is guaranteed to exist
and its data can be extracted with
.get(<field>) to get a
QueryDocumentSnapshot offers the same API surface as a
DocumentSnapshot. Since query results contain only existing documents, the
exists property will always be true and
data() will never return
QuerySnapshot contains zero or more
representing the results of a query. The documents can be accessed as an
array via the
docs property or enumerated using the
forEach method. The
number of documents can be determined via the
Defines configuration options for the Remote Config SDK.
A reference to a transaction.
Transaction object passed to a transaction's updateFunction provides
the methods to read and write data within the transaction context. See
A write batch, used to perform multiple writes as a single atomic unit.
WriteBatch object can be acquired by calling
provides methods for adding writes to the write batch. None of the
writes will be committed (or visible locally) until
Unlike transactions, write batches are persisted offline and therefore are preferable when you don't need to condition your writes on read data.
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