function Precondition(properties) {
                    if (properties)
                        for (var keys = Object.keys(properties), i = 0; i < keys.length; ++i)
                            if (properties[keys[i]] != null)
                                this[keys[i]] = properties[keys[i]];
                }
function Precondition(properties) {
                    if (properties)
                        for (var keys = Object.keys(properties), i = 0; i < keys.length; ++i)
                            if (properties[keys[i]] != null)
                                this[keys[i]] = properties[keys[i]];
                }
function Precondition ( properties ) { if ( properties ) for ( var keys = Object . keys ( properties ) , i = 0 ; i < keys . length ; ++ i ) if ( properties [ keys [ i ] ] != null ) this [ keys [ i ] ] = properties [ keys [ i ] ] ; }
Properties of a Precondition.
@memberof google.firestore.v1
@interface IPrecondition
@property {boolean|null} [exists] Precondition exists
@property {google.protobuf.ITimestamp|null} [updateTime] Precondition updateTime
 
Constructs a new Precondition.
@memberof google.firestore.v1
@classdesc Represents a Precondition.
@implements IPrecondition
@constructor
@param {google.firestore.v1.IPrecondition=} [properties] Properties to set
Properties of a Precondition .