if ([ 'Collection', 'CollectionPage' ].indexOf(rootActivity.type) !== -1) {
activities = (rootActivity as ActivityPubCollection).items
} else if ([ 'OrderedCollection', 'OrderedCollectionPage' ].indexOf(rootActivity.type) !== -1) {
if ([ 'Collection', 'CollectionPage' ].indexOf(rootActivity.type) !== -1) {
activities = (rootActivity as ActivityPubCollection).items
} else if ([ 'OrderedCollection', 'OrderedCollectionPage' ].indexOf(rootActivity.type) !== -1) {