code: function DocumentDelete(properties) {
                      this.removedTargetIds = [];
                      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]];
                  }
docs: Properties of a DocumentDelete.
  @memberof google.firestore.v1
  @interface IDocumentDelete
  @property {string|null} [document] DocumentDelete document
  @property {Array.<number>|null} [removedTargetIds] DocumentDelete removedTargetIds
  @property {google.protobuf.ITimestamp|null} [readTime] DocumentDelete readTime
   
  Constructs a new DocumentDelete.
  @memberof google.firestore.v1
  @classdesc Represents a DocumentDelete.
  @implements IDocumentDelete
  @constructor
  @param {google.firestore.v1.IDocumentDelete=} [properties] Properties to set