firebase-js-sdk/docs-devsite/firestore_.queryconstraint.md

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QueryConstraint class

A QueryConstraint is used to narrow the set of documents returned by a Firestore query. QueryConstraints are created by invoking where(), orderBy(), startAt(), startAfter(), endBefore(), endAt(), limit(), limitToLast() and can then be passed to query() to create a new query instance that also contains this QueryConstraint.

Signature:

export declare abstract class QueryConstraint 

Properties

Property	Modifiers	Type	Description
type		QueryConstraintType	The type of this query constraint

QueryConstraint.type

The type of this query constraint

Signature:

abstract readonly type: QueryConstraintType;