Options that can be passed to a ChangeStream. Note that startAfter, resumeAfter, and startAtOperationTime are all mutually exclusive, and the server will error if more than one is specified.
allowDiskUse lets the server know if it can use disk to store temporary results for the aggregation (requires mongodb 2.6 >).
The number of documents to return per batch.
return BSON regular expressions as BSONRegExp instances.
Allow driver to bypass schema validation in MongoDB 3.2 or higher.
the serializer will check if keys are valid.
Comment to apply to the operation.
In server versions pre-4.4, 'comment' must be string. A server error will be thrown if any other type is provided.
In server versions 4.4 and above, 'comment' can be any valid BSON type.
Return the query as cursor, on 2.6 > it returns as a real cursor on pre 2.6 it returns as an emulated cursor.
Enable utf8 validation when deserializing BSON documents. Defaults to true.
Specifies the verbosity mode for the explain output.
allow to specify if there what fields we wish to return as unserialized raw buffer.
Allowed values: 'updateLookup', 'whenAvailable', 'required'.
When set to 'updateLookup', the change notification for partial updates will include both a delta describing the changes to the document as well as a copy of the entire document that was changed from some time after the change occurred.
When set to 'whenAvailable', configures the change stream to return the post-image of the modified document for replace and update change events if the post-image for this event is available.
When set to 'required', the same behavior as 'whenAvailable' except that an error is raised if the post-image is not available.
Allowed values: 'whenAvailable', 'required', 'off'.
The default is to not send a value, which is equivalent to 'off'.
When set to 'whenAvailable', configures the change stream to return the pre-image of the modified document for replace, update, and delete change events if it is available.
When set to 'required', the same behavior as 'whenAvailable' except that an error is raised if the pre-image is not available.
Add an index selection hint to an aggregation command
serialize will not emit undefined fields (default:true)
Map of parameter names and values that can be accessed using $$var (requires MongoDB 5.0).
The maximum amount of time for the server to wait on new documents to satisfy a change stream query.
specifies a cumulative time limit in milliseconds for processing operations on the cursor. MongoDB interrupts the operation at the earliest following interrupt point.
when deserializing a Binary will return it as a node.js Buffer instance.
when deserializing a Long will fit it into a Number if it's smaller than 53 bits.
when deserializing will promote BSON values to their Node.js closest equivalent types.
Enabling the raw option will return a Node.js Buffer which is allocated using allocUnsafe API. See this section from the Node.js Docs here for more detail about what "unsafe" refers to in this context. If you need to maintain your own editable clone of the bytes returned for an extended life time of the process, it is recommended you allocate your own buffer and clone the contents:
Specify a read concern and level for the collection. (only MongoDB 3.2 or higher supported)
The preferred read preference (ReadPreference.primary, ReadPreference.primary_preferred, ReadPreference.secondary, ReadPreference.secondary_preferred, ReadPreference.nearest).
Allows you to start a changeStream after a specified event.
Should retry failed writes
Specify ClientSession for this command
When enabled, configures the change stream to include extra change events.
Similar to resumeAfter, but will allow you to start after an invalidated event.
Will start the changeStream after the specified operationTime.
when deserializing a Long will return as a BigInt.
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