Use iOS 26 Observation for Unit and Preview tests. (#5797)

* use observation in unit and preview tests instead of the async stream

* use a parsing approach that is independent of the sourcery annotation

* Fix observation deferred fulfillments not receiving the initial value

Observation's observe only emits transitions, not the value present at subscription time. Drop the leading initial value from the affected transitionValues sequences and assert it directly with #expect instead.

* improved docs

ElementX.xcodeproj/project.pbxproj

@@ -9609,6 +9609,7 @@
 			buildSettings = {
 				BUNDLE_LOADER = "$(TEST_HOST)";
 				INFOPLIST_FILE = PreviewTests/SupportingFiles/Info.plist;
+				IPHONEOS_DEPLOYMENT_TARGET = 26.0;
 				LD_RUNPATH_SEARCH_PATHS = (
 					"$(inherited)",
 					"@executable_path/Frameworks",
@@ -9720,6 +9721,7 @@
 			buildSettings = {
 				BUNDLE_LOADER = "$(TEST_HOST)";
 				INFOPLIST_FILE = UnitTests/SupportingFiles/Info.plist;
+				IPHONEOS_DEPLOYMENT_TARGET = 26.0;
 				LD_RUNPATH_SEARCH_PATHS = (
 					"$(inherited)",
 					"@executable_path/Frameworks",
@@ -9919,6 +9921,7 @@
 			buildSettings = {
 				BUNDLE_LOADER = "$(TEST_HOST)";
 				INFOPLIST_FILE = UnitTests/SupportingFiles/Info.plist;
+				IPHONEOS_DEPLOYMENT_TARGET = 26.0;
 				LD_RUNPATH_SEARCH_PATHS = (
 					"$(inherited)",
 					"@executable_path/Frameworks",
@@ -10082,6 +10085,7 @@
 			buildSettings = {
 				BUNDLE_LOADER = "$(TEST_HOST)";
 				INFOPLIST_FILE = PreviewTests/SupportingFiles/Info.plist;
+				IPHONEOS_DEPLOYMENT_TARGET = 26.0;
 				LD_RUNPATH_SEARCH_PATHS = (
 					"$(inherited)",
 					"@executable_path/Frameworks",

ElementX/Sources/Other/Extensions/Observable.swift

@@ -7,13 +7,25 @@
 //
 
 import Foundation
+import Observation
 import Synchronization
 
 extension Observable {
-    /// Creates an async stream for the specified property on this object. We probably won't need this once SE-0475 is available:
-    /// https://github.com/swiftlang/swift-evolution/blob/main/proposals/0475-observed.md
+    /// A convenience wrapper around the `Observations` sequence (SE-0475).
     ///
     /// - Parameter property: The key path to the property you would like to observe.
+    @available(iOS 26.0, *)
+    @MainActor func observe<Value: Sendable>(_ property: KeyPath<Self, Value>) -> Observations<Value, Never> {
+        Observations { self[keyPath: property] }
+    }
+    
+    /// Creates an async stream for the specified property on this object.
+    ///
+    /// iOS 18 fallback for ``observe(_:)``. Remove once the minimum deployment target reaches iOS 26.
+    ///
+    /// - Parameter property: The key path to the property you would like to observe.
+    @available(iOS, deprecated: 26.0, message: "Use observe(_:) which is backed by the Observations sequence.")
+    @_disfavoredOverload
     @MainActor func observe<Value: Sendable>(_ property: KeyPath<Self, Value>) -> AsyncStream<Value> {
         let (stream, continuation) = AsyncStream<Value>.makeStream()
         let (changeSignals, changeSignaller) = AsyncStream<Void>.makeStream()

ElementX/Sources/Other/TestablePreview/TestablePreviewsDictionary.swift

@@ -8,230 +8,237 @@ import SwiftUI
 
 
 enum TestablePreviewsDictionary {
-    static let dictionary: [String: any PreviewProvider.Type] = [
-        "AdvancedSettingsScreen_Previews" : AdvancedSettingsScreen_Previews.self,
-        "AnalyticsPromptScreen_Previews" : AnalyticsPromptScreen_Previews.self,
-        "AnalyticsSettingsScreen_Previews" : AnalyticsSettingsScreen_Previews.self,
-        "AppLockScreen_Previews" : AppLockScreen_Previews.self,
-        "AppLockSetupBiometricsScreen_Previews" : AppLockSetupBiometricsScreen_Previews.self,
-        "AppLockSetupPINScreen_Previews" : AppLockSetupPINScreen_Previews.self,
-        "AppLockSetupSettingsScreen_Previews" : AppLockSetupSettingsScreen_Previews.self,
-        "AudioMediaEventsTimelineView_Previews" : AudioMediaEventsTimelineView_Previews.self,
-        "AudioRoomTimelineView_Previews" : AudioRoomTimelineView_Previews.self,
-        "AuthenticationClassicAppBackupInstructionsView_Previews" : AuthenticationClassicAppBackupInstructionsView_Previews.self,
-        "AuthenticationStartScreen_Previews" : AuthenticationStartScreen_Previews.self,
-        "AvatarHeaderView_Previews" : AvatarHeaderView_Previews.self,
-        "BadgeLabel_Previews" : BadgeLabel_Previews.self,
-        "BlockedUsersScreen_Previews" : BlockedUsersScreen_Previews.self,
-        "BloomModifier_Previews" : BloomModifier_Previews.self,
-        "BugReportScreen_Previews" : BugReportScreen_Previews.self,
-        "CallInviteRoomTimelineView_Previews" : CallInviteRoomTimelineView_Previews.self,
-        "CallNotificationRoomTimelineView_Previews" : CallNotificationRoomTimelineView_Previews.self,
-        "ChatsSpaceFilterCell_Previews" : ChatsSpaceFilterCell_Previews.self,
-        "ChatsSpaceFiltersScreen_Previews" : ChatsSpaceFiltersScreen_Previews.self,
-        "CollapsibleRoomTimelineView_Previews" : CollapsibleRoomTimelineView_Previews.self,
-        "CompletionSuggestion_Previews" : CompletionSuggestion_Previews.self,
-        "ComposerToolbar_Previews" : ComposerToolbar_Previews.self,
-        "CopyTextButton_Previews" : CopyTextButton_Previews.self,
-        "CreateRoomSpaceSelectionSheet_Previews" : CreateRoomSpaceSelectionSheet_Previews.self,
-        "CreateRoom_Previews" : CreateRoom_Previews.self,
-        "DeactivateAccountScreen_Previews" : DeactivateAccountScreen_Previews.self,
-        "DeclineAndBlockScreen_Previews" : DeclineAndBlockScreen_Previews.self,
-        "EditRoomAddressScreen_Previews" : EditRoomAddressScreen_Previews.self,
-        "EmojiPickerScreenHeaderView_Previews" : EmojiPickerScreenHeaderView_Previews.self,
-        "EmojiPickerScreen_Previews" : EmojiPickerScreen_Previews.self,
-        "EmoteRoomTimelineView_Previews" : EmoteRoomTimelineView_Previews.self,
-        "EncryptedRoomTimelineView_Previews" : EncryptedRoomTimelineView_Previews.self,
-        "EncryptionResetPasswordScreen_Previews" : EncryptionResetPasswordScreen_Previews.self,
-        "EncryptionResetScreen_Previews" : EncryptionResetScreen_Previews.self,
-        "EstimatedWaveformView_Previews" : EstimatedWaveformView_Previews.self,
-        "FileMediaEventsTimelineView_Previews" : FileMediaEventsTimelineView_Previews.self,
-        "FileRoomTimelineView_Previews" : FileRoomTimelineView_Previews.self,
-        "FloatingDateBadge_Previews" : FloatingDateBadge_Previews.self,
-        "FormButtonStyles_Previews" : FormButtonStyles_Previews.self,
-        "FormattedBodyText_Previews" : FormattedBodyText_Previews.self,
-        "FormattingToolbar_Previews" : FormattingToolbar_Previews.self,
-        "FullscreenDialog_Previews" : FullscreenDialog_Previews.self,
-        "HighlightedTimelineItemModifier_Previews" : HighlightedTimelineItemModifier_Previews.self,
-        "HomeScreenEmptyStateView_Previews" : HomeScreenEmptyStateView_Previews.self,
-        "HomeScreenInviteCell_Previews" : HomeScreenInviteCell_Previews.self,
-        "HomeScreenKnockedCell_Previews" : HomeScreenKnockedCell_Previews.self,
-        "HomeScreenNewSoundBanner_Previews" : HomeScreenNewSoundBanner_Previews.self,
-        "HomeScreenRecoveryKeyConfirmationBanner_Previews" : HomeScreenRecoveryKeyConfirmationBanner_Previews.self,
-        "HomeScreenRoomCell_Previews" : HomeScreenRoomCell_Previews.self,
-        "HomeScreen_Previews" : HomeScreen_Previews.self,
-        "IdentityConfirmationScreen_Previews" : IdentityConfirmationScreen_Previews.self,
-        "IdentityConfirmedScreen_Previews" : IdentityConfirmedScreen_Previews.self,
-        "ImageMediaEventsTimelineView_Previews" : ImageMediaEventsTimelineView_Previews.self,
-        "ImageRoomTimelineView_Previews" : ImageRoomTimelineView_Previews.self,
-        "InviteUsersConfirmationSheetView_Previews" : InviteUsersConfirmationSheetView_Previews.self,
-        "InviteUsersScreenSelectedItem_Previews" : InviteUsersScreenSelectedItem_Previews.self,
-        "InviteUsersScreen_Previews" : InviteUsersScreen_Previews.self,
-        "JoinRoomByAddressView_Previews" : JoinRoomByAddressView_Previews.self,
-        "JoinRoomScreenSpace_Previews" : JoinRoomScreenSpace_Previews.self,
-        "JoinRoomScreen_Previews" : JoinRoomScreen_Previews.self,
-        "JoinedMembersBadgeView_Previews" : JoinedMembersBadgeView_Previews.self,
-        "KnockRequestCell_Previews" : KnockRequestCell_Previews.self,
-        "KnockRequestsBannerView_Previews" : KnockRequestsBannerView_Previews.self,
-        "KnockRequestsListEmptyStateView_Previews" : KnockRequestsListEmptyStateView_Previews.self,
-        "KnockRequestsListScreen_Previews" : KnockRequestsListScreen_Previews.self,
-        "LabsScreen_Previews" : LabsScreen_Previews.self,
-        "LeaveSpaceRoomDetailsCell_Previews" : LeaveSpaceRoomDetailsCell_Previews.self,
-        "LeaveSpaceView_Previews" : LeaveSpaceView_Previews.self,
-        "LegalInformationScreen_Previews" : LegalInformationScreen_Previews.self,
-        "LinkNewDeviceScreen_Previews" : LinkNewDeviceScreen_Previews.self,
-        "LiveLocationRoomTimelineView_Previews" : LiveLocationRoomTimelineView_Previews.self,
-        "LiveLocationSharingBannerView_Previews" : LiveLocationSharingBannerView_Previews.self,
-        "LiveLocationSheet_Previews" : LiveLocationSheet_Previews.self,
-        "LoadableImage_Previews" : LoadableImage_Previews.self,
-        "LocationMarkerView_Previews" : LocationMarkerView_Previews.self,
-        "LocationPickerSheet_Previews" : LocationPickerSheet_Previews.self,
-        "LocationRoomTimelineView_Previews" : LocationRoomTimelineView_Previews.self,
-        "LocationSharingScreen_Previews" : LocationSharingScreen_Previews.self,
-        "LoginScreen_Previews" : LoginScreen_Previews.self,
-        "LongPressWithFeedback_Previews" : LongPressWithFeedback_Previews.self,
-        "ManageAuthorizedSpacesScreen_Previews" : ManageAuthorizedSpacesScreen_Previews.self,
-        "ManageRoomMemberSheetView_Previews" : ManageRoomMemberSheetView_Previews.self,
-        "MapLibreStaticMapView_Previews" : MapLibreStaticMapView_Previews.self,
-        "MatrixUserPermalink_Previews" : MatrixUserPermalink_Previews.self,
-        "MediaEventsTimelineScreen_Previews" : MediaEventsTimelineScreen_Previews.self,
-        "MediaUploadPreviewScreen_Previews" : MediaUploadPreviewScreen_Previews.self,
-        "MentionSuggestionItemView_Previews" : MentionSuggestionItemView_Previews.self,
-        "MessageComposerTextField_Previews" : MessageComposerTextField_Previews.self,
-        "MessageComposer_Previews" : MessageComposer_Previews.self,
-        "MessageForwardingScreen_Previews" : MessageForwardingScreen_Previews.self,
-        "MessageText_Previews" : MessageText_Previews.self,
-        "NoticeRoomTimelineView_Previews" : NoticeRoomTimelineView_Previews.self,
-        "NotificationPermissionsScreen_Previews" : NotificationPermissionsScreen_Previews.self,
-        "NotificationSettingsEditScreenRoomCell_Previews" : NotificationSettingsEditScreenRoomCell_Previews.self,
-        "NotificationSettingsEditScreen_Previews" : NotificationSettingsEditScreen_Previews.self,
-        "NotificationSettingsScreen_Previews" : NotificationSettingsScreen_Previews.self,
-        "PINTextField_Previews" : PINTextField_Previews.self,
-        "PaginationIndicatorRoomTimelineView_Previews" : PaginationIndicatorRoomTimelineView_Previews.self,
-        "PillViewOnBubble_Previews" : PillViewOnBubble_Previews.self,
-        "PillView_Previews" : PillView_Previews.self,
-        "PinnedEventsTimelineScreen_Previews" : PinnedEventsTimelineScreen_Previews.self,
-        "PinnedItemsBannerView_Previews" : PinnedItemsBannerView_Previews.self,
-        "PinnedItemsIndicatorView_Previews" : PinnedItemsIndicatorView_Previews.self,
-        "PlaceholderAvatarImage_Previews" : PlaceholderAvatarImage_Previews.self,
-        "PlaceholderScreen_Previews" : PlaceholderScreen_Previews.self,
-        "PlaybackSpeedButton_Previews" : PlaybackSpeedButton_Previews.self,
-        "PollFormScreen_Previews" : PollFormScreen_Previews.self,
-        "PollOptionView_Previews" : PollOptionView_Previews.self,
-        "PollRoomTimelineView_Previews" : PollRoomTimelineView_Previews.self,
-        "PollView_Previews" : PollView_Previews.self,
-        "QRCodeErrorView_Previews" : QRCodeErrorView_Previews.self,
-        "QRCodeLoginScreen_Previews" : QRCodeLoginScreen_Previews.self,
-        "ReactionsSummaryView_Previews" : ReactionsSummaryView_Previews.self,
-        "ReadMarkerRoomTimelineView_Previews" : ReadMarkerRoomTimelineView_Previews.self,
-        "ReadReceiptCell_Previews" : ReadReceiptCell_Previews.self,
-        "ReadReceiptsSummaryView_Previews" : ReadReceiptsSummaryView_Previews.self,
-        "RedactedRoomTimelineView_Previews" : RedactedRoomTimelineView_Previews.self,
-        "ReportContentScreen_Previews" : ReportContentScreen_Previews.self,
-        "ReportRoomScreen_Previews" : ReportRoomScreen_Previews.self,
-        "ResolveVerifiedUserSendFailureScreen_Previews" : ResolveVerifiedUserSendFailureScreen_Previews.self,
-        "RoomAttachmentPicker_Previews" : RoomAttachmentPicker_Previews.self,
-        "RoomAvatarImage_Previews" : RoomAvatarImage_Previews.self,
-        "RoomChangePermissionsScreen_Previews" : RoomChangePermissionsScreen_Previews.self,
-        "RoomChangeRolesScreenRow_Previews" : RoomChangeRolesScreenRow_Previews.self,
-        "RoomChangeRolesScreenSelectedItem_Previews" : RoomChangeRolesScreenSelectedItem_Previews.self,
-        "RoomChangeRolesScreen_Previews" : RoomChangeRolesScreen_Previews.self,
-        "RoomDetailsEditScreen_Previews" : RoomDetailsEditScreen_Previews.self,
-        "RoomDetailsScreen_Previews" : RoomDetailsScreen_Previews.self,
-        "RoomDirectorySearchCell_Previews" : RoomDirectorySearchCell_Previews.self,
-        "RoomDirectorySearchScreen_Previews" : RoomDirectorySearchScreen_Previews.self,
-        "RoomHeaderView_Previews" : RoomHeaderView_Previews.self,
-        "RoomInviterLabel_Previews" : RoomInviterLabel_Previews.self,
-        "RoomListFilterView_Previews" : RoomListFilterView_Previews.self,
-        "RoomListFiltersEmptyStateView_Previews" : RoomListFiltersEmptyStateView_Previews.self,
-        "RoomListFiltersView_Previews" : RoomListFiltersView_Previews.self,
-        "RoomMemberDetailsScreen_Previews" : RoomMemberDetailsScreen_Previews.self,
-        "RoomMembersListMemberCell_Previews" : RoomMembersListMemberCell_Previews.self,
-        "RoomMembersListScreen_Previews" : RoomMembersListScreen_Previews.self,
-        "RoomNotificationSettingsCustomSectionView_Previews" : RoomNotificationSettingsCustomSectionView_Previews.self,
-        "RoomNotificationSettingsScreen_Previews" : RoomNotificationSettingsScreen_Previews.self,
-        "RoomNotificationSettingsUserDefinedScreen_Previews" : RoomNotificationSettingsUserDefinedScreen_Previews.self,
-        "RoomPollsHistoryScreen_Previews" : RoomPollsHistoryScreen_Previews.self,
-        "RoomRolesAndPermissionsScreen_Previews" : RoomRolesAndPermissionsScreen_Previews.self,
-        "RoomScreenFooterView_Previews" : RoomScreenFooterView_Previews.self,
-        "RoomScreen_Previews" : RoomScreen_Previews.self,
-        "RoomSelectionScreen_Previews" : RoomSelectionScreen_Previews.self,
-        "RoomThreadListScreen_Previews" : RoomThreadListScreen_Previews.self,
-        "SFNumberedListView_Previews" : SFNumberedListView_Previews.self,
-        "SearchScreen_Previews" : SearchScreen_Previews.self,
-        "SecureBackupKeyBackupScreen_Previews" : SecureBackupKeyBackupScreen_Previews.self,
-        "SecureBackupLogoutConfirmationScreen_Previews" : SecureBackupLogoutConfirmationScreen_Previews.self,
-        "SecureBackupRecoveryKeyScreen_Previews" : SecureBackupRecoveryKeyScreen_Previews.self,
-        "SecureBackupScreen_Previews" : SecureBackupScreen_Previews.self,
-        "SecurityAndPrivacyScreen_Previews" : SecurityAndPrivacyScreen_Previews.self,
-        "SendInviteConfirmationView_Previews" : SendInviteConfirmationView_Previews.self,
-        "SeparatorMediaEventsTimelineView_Previews" : SeparatorMediaEventsTimelineView_Previews.self,
-        "SeparatorRoomTimelineView_Previews" : SeparatorRoomTimelineView_Previews.self,
-        "ServerConfirmationScreen_Previews" : ServerConfirmationScreen_Previews.self,
-        "ServerSelection_Previews" : ServerSelection_Previews.self,
-        "SessionVerificationRequestDetailsView_Previews" : SessionVerificationRequestDetailsView_Previews.self,
-        "SessionVerification_Previews" : SessionVerification_Previews.self,
-        "SettingsScreen_Previews" : SettingsScreen_Previews.self,
-        "ShimmerOverlay_Previews" : ShimmerOverlay_Previews.self,
-        "SoftLogoutScreen_Previews" : SoftLogoutScreen_Previews.self,
-        "SpaceAddRoomsScreenSelectedItem_Previews" : SpaceAddRoomsScreenSelectedItem_Previews.self,
-        "SpaceAddRoomsScreen_Previews" : SpaceAddRoomsScreen_Previews.self,
-        "SpaceHeaderTopicSheetView_Previews" : SpaceHeaderTopicSheetView_Previews.self,
-        "SpaceHeaderView_Previews" : SpaceHeaderView_Previews.self,
-        "SpaceRemoveChildrenConfirmationView_Previews" : SpaceRemoveChildrenConfirmationView_Previews.self,
-        "SpaceRoomCell_Previews" : SpaceRoomCell_Previews.self,
-        "SpaceScreen_Previews" : SpaceScreen_Previews.self,
-        "SpaceSettingsScreen_Previews" : SpaceSettingsScreen_Previews.self,
-        "SpacesScreen_Previews" : SpacesScreen_Previews.self,
-        "SplashScreen_Previews" : SplashScreen_Previews.self,
-        "StackedAvatarsView_Previews" : StackedAvatarsView_Previews.self,
-        "StartChatScreen_Previews" : StartChatScreen_Previews.self,
-        "StateRoomTimelineView_Previews" : StateRoomTimelineView_Previews.self,
-        "StaticLocationSheet_Previews" : StaticLocationSheet_Previews.self,
-        "StickerRoomTimelineView_Previews" : StickerRoomTimelineView_Previews.self,
-        "SwipeRightAction_Previews" : SwipeRightAction_Previews.self,
-        "SwipeToReplyView_Previews" : SwipeToReplyView_Previews.self,
-        "TextRoomTimelineView_Previews" : TextRoomTimelineView_Previews.self,
-        "ThreadDecorator_Previews" : ThreadDecorator_Previews.self,
-        "TimelineDeliveryStatusView_Previews" : TimelineDeliveryStatusView_Previews.self,
-        "TimelineItemBubbledStylerView_Previews" : TimelineItemBubbledStylerView_Previews.self,
-        "TimelineItemDebugView_Previews" : TimelineItemDebugView_Previews.self,
-        "TimelineItemMenu_Previews" : TimelineItemMenu_Previews.self,
-        "TimelineItemSendInfoLabel_Previews" : TimelineItemSendInfoLabel_Previews.self,
-        "TimelineItemStyler_Previews" : TimelineItemStyler_Previews.self,
-        "TimelineMediaPreviewDetailsView_Previews" : TimelineMediaPreviewDetailsView_Previews.self,
-        "TimelineMediaPreviewRedactConfirmationView_Previews" : TimelineMediaPreviewRedactConfirmationView_Previews.self,
-        "TimelineReactionView_Previews" : TimelineReactionView_Previews.self,
-        "TimelineReadReceiptsView_Previews" : TimelineReadReceiptsView_Previews.self,
-        "TimelineReplyView_Previews" : TimelineReplyView_Previews.self,
-        "TimelineScrollButton_Previews" : TimelineScrollButton_Previews.self,
-        "TimelineStartRoomTimelineView_Previews" : TimelineStartRoomTimelineView_Previews.self,
-        "TimelineThreadSummaryView_Previews" : TimelineThreadSummaryView_Previews.self,
-        "TombstonedAvatarImage_Previews" : TombstonedAvatarImage_Previews.self,
-        "ToolbarButton_Previews" : ToolbarButton_Previews.self,
-        "TypingIndicatorView_Previews" : TypingIndicatorView_Previews.self,
-        "UnsupportedRoomTimelineView_Previews" : UnsupportedRoomTimelineView_Previews.self,
-        "UserDetailsEditScreen_Previews" : UserDetailsEditScreen_Previews.self,
-        "UserIndicatorModalView_Previews" : UserIndicatorModalView_Previews.self,
-        "UserIndicatorToastView_Previews" : UserIndicatorToastView_Previews.self,
-        "UserLocationCell_Previews" : UserLocationCell_Previews.self,
-        "UserProfileCell_Previews" : UserProfileCell_Previews.self,
-        "UserProfileScreen_Previews" : UserProfileScreen_Previews.self,
-        "VerificationBadge_Previews" : VerificationBadge_Previews.self,
-        "VideoMediaEventsTimelineView_Previews" : VideoMediaEventsTimelineView_Previews.self,
-        "VideoRoomTimelineView_Previews" : VideoRoomTimelineView_Previews.self,
-        "VisualListItem_Previews" : VisualListItem_Previews.self,
-        "VoiceMessageButton_Previews" : VoiceMessageButton_Previews.self,
-        "VoiceMessageMediaEventsTimelineView_Previews" : VoiceMessageMediaEventsTimelineView_Previews.self,
-        "VoiceMessagePreviewComposer_Previews" : VoiceMessagePreviewComposer_Previews.self,
-        "VoiceMessageRecordingButton_Previews" : VoiceMessageRecordingButton_Previews.self,
-        "VoiceMessageRecordingComposer_Previews" : VoiceMessageRecordingComposer_Previews.self,
-        "VoiceMessageRecordingView_Previews" : VoiceMessageRecordingView_Previews.self,
-        "VoiceMessageRoomPlaybackView_Previews" : VoiceMessageRoomPlaybackView_Previews.self,
-        "VoiceMessageRoomTimelineView_Previews" : VoiceMessageRoomTimelineView_Previews.self,
-        "VoiceMessageTrashButton_Previews" : VoiceMessageTrashButton_Previews.self,
-        "WaveformCursorView_Previews" : WaveformCursorView_Previews.self,
-    ]
+    static let dictionary: [String: any PreviewProvider.Type] = {
+        var dictionary: [String: any PreviewProvider.Type] = [
+            "AdvancedSettingsScreen_Previews" : AdvancedSettingsScreen_Previews.self,
+            "AnalyticsPromptScreen_Previews" : AnalyticsPromptScreen_Previews.self,
+            "AnalyticsSettingsScreen_Previews" : AnalyticsSettingsScreen_Previews.self,
+            "AppLockScreen_Previews" : AppLockScreen_Previews.self,
+            "AppLockSetupBiometricsScreen_Previews" : AppLockSetupBiometricsScreen_Previews.self,
+            "AppLockSetupPINScreen_Previews" : AppLockSetupPINScreen_Previews.self,
+            "AppLockSetupSettingsScreen_Previews" : AppLockSetupSettingsScreen_Previews.self,
+            "AudioMediaEventsTimelineView_Previews" : AudioMediaEventsTimelineView_Previews.self,
+            "AudioRoomTimelineView_Previews" : AudioRoomTimelineView_Previews.self,
+            "AuthenticationClassicAppBackupInstructionsView_Previews" : AuthenticationClassicAppBackupInstructionsView_Previews.self,
+            "AuthenticationStartScreen_Previews" : AuthenticationStartScreen_Previews.self,
+            "AvatarHeaderView_Previews" : AvatarHeaderView_Previews.self,
+            "BadgeLabel_Previews" : BadgeLabel_Previews.self,
+            "BlockedUsersScreen_Previews" : BlockedUsersScreen_Previews.self,
+            "BloomModifier_Previews" : BloomModifier_Previews.self,
+            "BugReportScreen_Previews" : BugReportScreen_Previews.self,
+            "CallInviteRoomTimelineView_Previews" : CallInviteRoomTimelineView_Previews.self,
+            "CallNotificationRoomTimelineView_Previews" : CallNotificationRoomTimelineView_Previews.self,
+            "ChatsSpaceFilterCell_Previews" : ChatsSpaceFilterCell_Previews.self,
+            "ChatsSpaceFiltersScreen_Previews" : ChatsSpaceFiltersScreen_Previews.self,
+            "CollapsibleRoomTimelineView_Previews" : CollapsibleRoomTimelineView_Previews.self,
+            "CompletionSuggestion_Previews" : CompletionSuggestion_Previews.self,
+            "ComposerToolbar_Previews" : ComposerToolbar_Previews.self,
+            "CopyTextButton_Previews" : CopyTextButton_Previews.self,
+            "CreateRoomSpaceSelectionSheet_Previews" : CreateRoomSpaceSelectionSheet_Previews.self,
+            "CreateRoom_Previews" : CreateRoom_Previews.self,
+            "DeactivateAccountScreen_Previews" : DeactivateAccountScreen_Previews.self,
+            "DeclineAndBlockScreen_Previews" : DeclineAndBlockScreen_Previews.self,
+            "EditRoomAddressScreen_Previews" : EditRoomAddressScreen_Previews.self,
+            "EmojiPickerScreenHeaderView_Previews" : EmojiPickerScreenHeaderView_Previews.self,
+            "EmoteRoomTimelineView_Previews" : EmoteRoomTimelineView_Previews.self,
+            "EncryptedRoomTimelineView_Previews" : EncryptedRoomTimelineView_Previews.self,
+            "EncryptionResetPasswordScreen_Previews" : EncryptionResetPasswordScreen_Previews.self,
+            "EncryptionResetScreen_Previews" : EncryptionResetScreen_Previews.self,
+            "EstimatedWaveformView_Previews" : EstimatedWaveformView_Previews.self,
+            "FileMediaEventsTimelineView_Previews" : FileMediaEventsTimelineView_Previews.self,
+            "FileRoomTimelineView_Previews" : FileRoomTimelineView_Previews.self,
+            "FloatingDateBadge_Previews" : FloatingDateBadge_Previews.self,
+            "FormButtonStyles_Previews" : FormButtonStyles_Previews.self,
+            "FormattedBodyText_Previews" : FormattedBodyText_Previews.self,
+            "FormattingToolbar_Previews" : FormattingToolbar_Previews.self,
+            "FullscreenDialog_Previews" : FullscreenDialog_Previews.self,
+            "HighlightedTimelineItemModifier_Previews" : HighlightedTimelineItemModifier_Previews.self,
+            "HomeScreenEmptyStateView_Previews" : HomeScreenEmptyStateView_Previews.self,
+            "HomeScreenInviteCell_Previews" : HomeScreenInviteCell_Previews.self,
+            "HomeScreenKnockedCell_Previews" : HomeScreenKnockedCell_Previews.self,
+            "HomeScreenNewSoundBanner_Previews" : HomeScreenNewSoundBanner_Previews.self,
+            "HomeScreenRecoveryKeyConfirmationBanner_Previews" : HomeScreenRecoveryKeyConfirmationBanner_Previews.self,
+            "HomeScreenRoomCell_Previews" : HomeScreenRoomCell_Previews.self,
+            "HomeScreen_Previews" : HomeScreen_Previews.self,
+            "IdentityConfirmedScreen_Previews" : IdentityConfirmedScreen_Previews.self,
+            "ImageMediaEventsTimelineView_Previews" : ImageMediaEventsTimelineView_Previews.self,
+            "ImageRoomTimelineView_Previews" : ImageRoomTimelineView_Previews.self,
+            "InviteUsersConfirmationSheetView_Previews" : InviteUsersConfirmationSheetView_Previews.self,
+            "InviteUsersScreenSelectedItem_Previews" : InviteUsersScreenSelectedItem_Previews.self,
+            "InviteUsersScreen_Previews" : InviteUsersScreen_Previews.self,
+            "JoinRoomByAddressView_Previews" : JoinRoomByAddressView_Previews.self,
+            "JoinRoomScreenSpace_Previews" : JoinRoomScreenSpace_Previews.self,
+            "JoinRoomScreen_Previews" : JoinRoomScreen_Previews.self,
+            "JoinedMembersBadgeView_Previews" : JoinedMembersBadgeView_Previews.self,
+            "KnockRequestCell_Previews" : KnockRequestCell_Previews.self,
+            "KnockRequestsBannerView_Previews" : KnockRequestsBannerView_Previews.self,
+            "KnockRequestsListEmptyStateView_Previews" : KnockRequestsListEmptyStateView_Previews.self,
+            "KnockRequestsListScreen_Previews" : KnockRequestsListScreen_Previews.self,
+            "LabsScreen_Previews" : LabsScreen_Previews.self,
+            "LeaveSpaceRoomDetailsCell_Previews" : LeaveSpaceRoomDetailsCell_Previews.self,
+            "LeaveSpaceView_Previews" : LeaveSpaceView_Previews.self,
+            "LegalInformationScreen_Previews" : LegalInformationScreen_Previews.self,
+            "LiveLocationRoomTimelineView_Previews" : LiveLocationRoomTimelineView_Previews.self,
+            "LiveLocationSharingBannerView_Previews" : LiveLocationSharingBannerView_Previews.self,
+            "LiveLocationSheet_Previews" : LiveLocationSheet_Previews.self,
+            "LoadableImage_Previews" : LoadableImage_Previews.self,
+            "LocationMarkerView_Previews" : LocationMarkerView_Previews.self,
+            "LocationPickerSheet_Previews" : LocationPickerSheet_Previews.self,
+            "LocationRoomTimelineView_Previews" : LocationRoomTimelineView_Previews.self,
+            "LocationSharingScreen_Previews" : LocationSharingScreen_Previews.self,
+            "LongPressWithFeedback_Previews" : LongPressWithFeedback_Previews.self,
+            "ManageAuthorizedSpacesScreen_Previews" : ManageAuthorizedSpacesScreen_Previews.self,
+            "ManageRoomMemberSheetView_Previews" : ManageRoomMemberSheetView_Previews.self,
+            "MapLibreStaticMapView_Previews" : MapLibreStaticMapView_Previews.self,
+            "MatrixUserPermalink_Previews" : MatrixUserPermalink_Previews.self,
+            "MediaEventsTimelineScreen_Previews" : MediaEventsTimelineScreen_Previews.self,
+            "MediaUploadPreviewScreen_Previews" : MediaUploadPreviewScreen_Previews.self,
+            "MentionSuggestionItemView_Previews" : MentionSuggestionItemView_Previews.self,
+            "MessageComposerTextField_Previews" : MessageComposerTextField_Previews.self,
+            "MessageComposer_Previews" : MessageComposer_Previews.self,
+            "MessageForwardingScreen_Previews" : MessageForwardingScreen_Previews.self,
+            "MessageText_Previews" : MessageText_Previews.self,
+            "NoticeRoomTimelineView_Previews" : NoticeRoomTimelineView_Previews.self,
+            "NotificationPermissionsScreen_Previews" : NotificationPermissionsScreen_Previews.self,
+            "NotificationSettingsEditScreenRoomCell_Previews" : NotificationSettingsEditScreenRoomCell_Previews.self,
+            "NotificationSettingsEditScreen_Previews" : NotificationSettingsEditScreen_Previews.self,
+            "PINTextField_Previews" : PINTextField_Previews.self,
+            "PaginationIndicatorRoomTimelineView_Previews" : PaginationIndicatorRoomTimelineView_Previews.self,
+            "PillViewOnBubble_Previews" : PillViewOnBubble_Previews.self,
+            "PillView_Previews" : PillView_Previews.self,
+            "PinnedEventsTimelineScreen_Previews" : PinnedEventsTimelineScreen_Previews.self,
+            "PinnedItemsBannerView_Previews" : PinnedItemsBannerView_Previews.self,
+            "PinnedItemsIndicatorView_Previews" : PinnedItemsIndicatorView_Previews.self,
+            "PlaceholderAvatarImage_Previews" : PlaceholderAvatarImage_Previews.self,
+            "PlaceholderScreen_Previews" : PlaceholderScreen_Previews.self,
+            "PlaybackSpeedButton_Previews" : PlaybackSpeedButton_Previews.self,
+            "PollFormScreen_Previews" : PollFormScreen_Previews.self,
+            "PollOptionView_Previews" : PollOptionView_Previews.self,
+            "PollRoomTimelineView_Previews" : PollRoomTimelineView_Previews.self,
+            "PollView_Previews" : PollView_Previews.self,
+            "QRCodeErrorView_Previews" : QRCodeErrorView_Previews.self,
+            "QRCodeLoginScreen_Previews" : QRCodeLoginScreen_Previews.self,
+            "ReactionsSummaryView_Previews" : ReactionsSummaryView_Previews.self,
+            "ReadMarkerRoomTimelineView_Previews" : ReadMarkerRoomTimelineView_Previews.self,
+            "ReadReceiptCell_Previews" : ReadReceiptCell_Previews.self,
+            "ReadReceiptsSummaryView_Previews" : ReadReceiptsSummaryView_Previews.self,
+            "RedactedRoomTimelineView_Previews" : RedactedRoomTimelineView_Previews.self,
+            "ReportContentScreen_Previews" : ReportContentScreen_Previews.self,
+            "ReportRoomScreen_Previews" : ReportRoomScreen_Previews.self,
+            "ResolveVerifiedUserSendFailureScreen_Previews" : ResolveVerifiedUserSendFailureScreen_Previews.self,
+            "RoomAttachmentPicker_Previews" : RoomAttachmentPicker_Previews.self,
+            "RoomAvatarImage_Previews" : RoomAvatarImage_Previews.self,
+            "RoomChangePermissionsScreen_Previews" : RoomChangePermissionsScreen_Previews.self,
+            "RoomChangeRolesScreenRow_Previews" : RoomChangeRolesScreenRow_Previews.self,
+            "RoomChangeRolesScreenSelectedItem_Previews" : RoomChangeRolesScreenSelectedItem_Previews.self,
+            "RoomChangeRolesScreen_Previews" : RoomChangeRolesScreen_Previews.self,
+            "RoomDetailsEditScreen_Previews" : RoomDetailsEditScreen_Previews.self,
+            "RoomDirectorySearchCell_Previews" : RoomDirectorySearchCell_Previews.self,
+            "RoomDirectorySearchScreen_Previews" : RoomDirectorySearchScreen_Previews.self,
+            "RoomHeaderView_Previews" : RoomHeaderView_Previews.self,
+            "RoomInviterLabel_Previews" : RoomInviterLabel_Previews.self,
+            "RoomListFilterView_Previews" : RoomListFilterView_Previews.self,
+            "RoomListFiltersEmptyStateView_Previews" : RoomListFiltersEmptyStateView_Previews.self,
+            "RoomListFiltersView_Previews" : RoomListFiltersView_Previews.self,
+            "RoomMemberDetailsScreen_Previews" : RoomMemberDetailsScreen_Previews.self,
+            "RoomMembersListMemberCell_Previews" : RoomMembersListMemberCell_Previews.self,
+            "RoomMembersListScreen_Previews" : RoomMembersListScreen_Previews.self,
+            "RoomNotificationSettingsCustomSectionView_Previews" : RoomNotificationSettingsCustomSectionView_Previews.self,
+            "RoomNotificationSettingsScreen_Previews" : RoomNotificationSettingsScreen_Previews.self,
+            "RoomNotificationSettingsUserDefinedScreen_Previews" : RoomNotificationSettingsUserDefinedScreen_Previews.self,
+            "RoomPollsHistoryScreen_Previews" : RoomPollsHistoryScreen_Previews.self,
+            "RoomRolesAndPermissionsScreen_Previews" : RoomRolesAndPermissionsScreen_Previews.self,
+            "RoomScreenFooterView_Previews" : RoomScreenFooterView_Previews.self,
+            "RoomScreen_Previews" : RoomScreen_Previews.self,
+            "RoomSelectionScreen_Previews" : RoomSelectionScreen_Previews.self,
+            "RoomThreadListScreen_Previews" : RoomThreadListScreen_Previews.self,
+            "SFNumberedListView_Previews" : SFNumberedListView_Previews.self,
+            "SearchScreen_Previews" : SearchScreen_Previews.self,
+            "SecureBackupKeyBackupScreen_Previews" : SecureBackupKeyBackupScreen_Previews.self,
+            "SecurityAndPrivacyScreen_Previews" : SecurityAndPrivacyScreen_Previews.self,
+            "SendInviteConfirmationView_Previews" : SendInviteConfirmationView_Previews.self,
+            "SeparatorMediaEventsTimelineView_Previews" : SeparatorMediaEventsTimelineView_Previews.self,
+            "SeparatorRoomTimelineView_Previews" : SeparatorRoomTimelineView_Previews.self,
+            "ServerConfirmationScreen_Previews" : ServerConfirmationScreen_Previews.self,
+            "SessionVerificationRequestDetailsView_Previews" : SessionVerificationRequestDetailsView_Previews.self,
+            "SessionVerification_Previews" : SessionVerification_Previews.self,
+            "ShimmerOverlay_Previews" : ShimmerOverlay_Previews.self,
+            "SoftLogoutScreen_Previews" : SoftLogoutScreen_Previews.self,
+            "SpaceAddRoomsScreenSelectedItem_Previews" : SpaceAddRoomsScreenSelectedItem_Previews.self,
+            "SpaceHeaderTopicSheetView_Previews" : SpaceHeaderTopicSheetView_Previews.self,
+            "SpaceHeaderView_Previews" : SpaceHeaderView_Previews.self,
+            "SpaceRemoveChildrenConfirmationView_Previews" : SpaceRemoveChildrenConfirmationView_Previews.self,
+            "SpaceRoomCell_Previews" : SpaceRoomCell_Previews.self,
+            "SpaceSettingsScreen_Previews" : SpaceSettingsScreen_Previews.self,
+            "SpacesScreen_Previews" : SpacesScreen_Previews.self,
+            "SplashScreen_Previews" : SplashScreen_Previews.self,
+            "StackedAvatarsView_Previews" : StackedAvatarsView_Previews.self,
+            "StartChatScreen_Previews" : StartChatScreen_Previews.self,
+            "StateRoomTimelineView_Previews" : StateRoomTimelineView_Previews.self,
+            "StaticLocationSheet_Previews" : StaticLocationSheet_Previews.self,
+            "StickerRoomTimelineView_Previews" : StickerRoomTimelineView_Previews.self,
+            "SwipeRightAction_Previews" : SwipeRightAction_Previews.self,
+            "SwipeToReplyView_Previews" : SwipeToReplyView_Previews.self,
+            "TextRoomTimelineView_Previews" : TextRoomTimelineView_Previews.self,
+            "ThreadDecorator_Previews" : ThreadDecorator_Previews.self,
+            "TimelineDeliveryStatusView_Previews" : TimelineDeliveryStatusView_Previews.self,
+            "TimelineItemBubbledStylerView_Previews" : TimelineItemBubbledStylerView_Previews.self,
+            "TimelineItemDebugView_Previews" : TimelineItemDebugView_Previews.self,
+            "TimelineItemMenu_Previews" : TimelineItemMenu_Previews.self,
+            "TimelineItemSendInfoLabel_Previews" : TimelineItemSendInfoLabel_Previews.self,
+            "TimelineItemStyler_Previews" : TimelineItemStyler_Previews.self,
+            "TimelineMediaPreviewRedactConfirmationView_Previews" : TimelineMediaPreviewRedactConfirmationView_Previews.self,
+            "TimelineReactionView_Previews" : TimelineReactionView_Previews.self,
+            "TimelineReadReceiptsView_Previews" : TimelineReadReceiptsView_Previews.self,
+            "TimelineReplyView_Previews" : TimelineReplyView_Previews.self,
+            "TimelineScrollButton_Previews" : TimelineScrollButton_Previews.self,
+            "TimelineStartRoomTimelineView_Previews" : TimelineStartRoomTimelineView_Previews.self,
+            "TimelineThreadSummaryView_Previews" : TimelineThreadSummaryView_Previews.self,
+            "TombstonedAvatarImage_Previews" : TombstonedAvatarImage_Previews.self,
+            "ToolbarButton_Previews" : ToolbarButton_Previews.self,
+            "TypingIndicatorView_Previews" : TypingIndicatorView_Previews.self,
+            "UnsupportedRoomTimelineView_Previews" : UnsupportedRoomTimelineView_Previews.self,
+            "UserDetailsEditScreen_Previews" : UserDetailsEditScreen_Previews.self,
+            "UserIndicatorModalView_Previews" : UserIndicatorModalView_Previews.self,
+            "UserIndicatorToastView_Previews" : UserIndicatorToastView_Previews.self,
+            "UserLocationCell_Previews" : UserLocationCell_Previews.self,
+            "UserProfileCell_Previews" : UserProfileCell_Previews.self,
+            "VerificationBadge_Previews" : VerificationBadge_Previews.self,
+            "VideoMediaEventsTimelineView_Previews" : VideoMediaEventsTimelineView_Previews.self,
+            "VideoRoomTimelineView_Previews" : VideoRoomTimelineView_Previews.self,
+            "VisualListItem_Previews" : VisualListItem_Previews.self,
+            "VoiceMessageButton_Previews" : VoiceMessageButton_Previews.self,
+            "VoiceMessageMediaEventsTimelineView_Previews" : VoiceMessageMediaEventsTimelineView_Previews.self,
+            "VoiceMessagePreviewComposer_Previews" : VoiceMessagePreviewComposer_Previews.self,
+            "VoiceMessageRecordingButton_Previews" : VoiceMessageRecordingButton_Previews.self,
+            "VoiceMessageRecordingComposer_Previews" : VoiceMessageRecordingComposer_Previews.self,
+            "VoiceMessageRecordingView_Previews" : VoiceMessageRecordingView_Previews.self,
+            "VoiceMessageRoomPlaybackView_Previews" : VoiceMessageRoomPlaybackView_Previews.self,
+            "VoiceMessageRoomTimelineView_Previews" : VoiceMessageRoomTimelineView_Previews.self,
+            "VoiceMessageTrashButton_Previews" : VoiceMessageTrashButton_Previews.self,
+            "WaveformCursorView_Previews" : WaveformCursorView_Previews.self,
+        ]
+        // Previews carrying an @available attribute (e.g. those observing state through the iOS 26
+        // Observations-based observe(_:)) can't be referenced unconditionally in this iOS 18 target.
+        if #available(iOS 26.0, *) {
+            dictionary["EmojiPickerScreen_Previews"] = EmojiPickerScreen_Previews.self
+            dictionary["IdentityConfirmationScreen_Previews"] = IdentityConfirmationScreen_Previews.self
+            dictionary["LinkNewDeviceScreen_Previews"] = LinkNewDeviceScreen_Previews.self
+            dictionary["LoginScreen_Previews"] = LoginScreen_Previews.self
+            dictionary["NotificationSettingsScreen_Previews"] = NotificationSettingsScreen_Previews.self
+            dictionary["RoomDetailsScreen_Previews"] = RoomDetailsScreen_Previews.self
+            dictionary["SecureBackupLogoutConfirmationScreen_Previews"] = SecureBackupLogoutConfirmationScreen_Previews.self
+            dictionary["SecureBackupRecoveryKeyScreen_Previews"] = SecureBackupRecoveryKeyScreen_Previews.self
+            dictionary["SecureBackupScreen_Previews"] = SecureBackupScreen_Previews.self
+            dictionary["ServerSelection_Previews"] = ServerSelection_Previews.self
+            dictionary["SettingsScreen_Previews"] = SettingsScreen_Previews.self
+            dictionary["SpaceAddRoomsScreen_Previews"] = SpaceAddRoomsScreen_Previews.self
+            dictionary["SpaceScreen_Previews"] = SpaceScreen_Previews.self
+            dictionary["TimelineMediaPreviewDetailsView_Previews"] = TimelineMediaPreviewDetailsView_Previews.self
+            dictionary["UserProfileScreen_Previews"] = UserProfileScreen_Previews.self
+        }
+        return dictionary
+    }()
  }
 
 // swiftlint:enable all

ElementX/Sources/Screens/Authentication/LoginScreen/View/LoginScreen.swift

@@ -123,6 +123,7 @@ struct LoginScreen: View {
 
 // MARK: - Previews
 
+@available(iOS 26.0, *)
 struct LoginScreen_Previews: PreviewProvider, TestablePreview {
     static let viewModel = makeViewModel()
     static let credentialsViewModel = makeViewModel(withCredentials: true)

ElementX/Sources/Screens/Authentication/ServerSelectionScreen/View/ServerSelectionScreen.swift

@@ -91,6 +91,7 @@ struct ServerSelectionScreen: View {
 
 // MARK: - Previews
 
+@available(iOS 26.0, *)
 struct ServerSelection_Previews: PreviewProvider, TestablePreview {
     static let matrixViewModel = makeViewModel(for: "https://matrix.org")
     static let emptyViewModel = makeViewModel(for: "")

ElementX/Sources/Screens/EmojiPickerScreen/View/EmojiPickerScreen.swift

@@ -100,6 +100,7 @@ struct EmojiPickerScreen: View {
 
 // MARK: - Previews
 
+@available(iOS 26.0, *)
 struct EmojiPickerScreen_Previews: PreviewProvider, TestablePreview {
     static let viewModel = EmojiPickerScreenViewModel(itemID: .randomEvent,
                                                       selectedEmojis: ["😀", "😄"],

ElementX/Sources/Screens/FilePreviewScreen/View/TimelineMediaPreviewDetailsView.swift

@@ -169,6 +169,7 @@ struct TimelineMediaPreviewDetailsView: View {
 
 import UniformTypeIdentifiers
 
+@available(iOS 26.0, *)
 struct TimelineMediaPreviewDetailsView_Previews: PreviewProvider, TestablePreview {
     static let viewModel = makeViewModel(contentType: .jpeg, isOutgoing: true)
     static let loadingViewModel = makeViewModel(contentType: .jpeg, isOutgoing: true, isDownloaded: false)

ElementX/Sources/Screens/LinkNewDeviceScreen/View/LinkNewDeviceScreen.swift

@@ -103,6 +103,7 @@ struct LinkNewDeviceScreen: View {
 
 // MARK: - Previews
 
+@available(iOS 26.0, *)
 struct LinkNewDeviceScreen_Previews: PreviewProvider, TestablePreview {
     static let viewModel = makeViewModel(mode: .readyToLink(.idle))
     static let verifyingViewModel = makeViewModel(mode: .readyToLink(.verifyingDeviceOwner))

ElementX/Sources/Screens/Onboarding/IdentityConfirmationScreen/View/IdentityConfirmationScreen.swift

@@ -116,6 +116,7 @@ struct IdentityConfirmationScreen: View {
 
 // MARK: - Previews
 
+@available(iOS 26.0, *)
 struct IdentityConfirmationScreen_Previews: PreviewProvider, TestablePreview {
     static var viewModel = makeViewModel()
     static var loadingViewModel = makeViewModel(recoveryState: .unknown)

ElementX/Sources/Screens/RoomDetailsScreen/View/RoomDetailsScreen.swift

@@ -359,6 +359,7 @@ struct RoomDetailsScreen: View {
 
 import MatrixRustSDK
 
+@available(iOS 26.0, *)
 struct RoomDetailsScreen_Previews: PreviewProvider, TestablePreview {
     static let genericWorldReadableRoomViewModel = makeGenericRoomViewModel(historyVisibility: .worldReadable)
     static let genericJoinedRoomViewModel = makeGenericRoomViewModel(historyVisibility: .joined)

ElementX/Sources/Screens/SecureBackup/SecureBackupLogoutConfirmationScreen/View/SecureBackupLogoutConfirmationScreen.swift

@@ -110,6 +110,7 @@ struct SecureBackupLogoutConfirmationScreen: View {
 
 // MARK: - Previews
 
+@available(iOS 26.0, *)
 struct SecureBackupLogoutConfirmationScreen_Previews: PreviewProvider, TestablePreview {
     static let viewModel = makeViewModel(mode: .saveRecoveryKey)
     static let waitingViewModel = makeViewModel(mode: .waitingToStart(hasStalled: false))

ElementX/Sources/Screens/SecureBackup/SecureBackupRecoveryKeyScreen/View/SecureBackupRecoveryKeyScreen.swift

@@ -237,6 +237,7 @@ private struct RecoveryKeyView: View {
 
 // MARK: - Previews
 
+@available(iOS 26.0, *)
 struct SecureBackupRecoveryKeyScreen_Previews: PreviewProvider, TestablePreview {
     static let key = "EsTM njec uHYA yHmh dQdW Nj4o bNRU 9jMN XGMc KUNM UFr5 R8GY"
     static let notSetUpViewModel = viewModel(recoveryState: .disabled)

ElementX/Sources/Screens/SecureBackup/SecureBackupScreen/View/SecureBackupScreen.swift

@@ -116,6 +116,7 @@ struct SecureBackupScreen: View {
 
 // MARK: - Previews
 
+@available(iOS 26.0, *)
 struct SecureBackupScreen_Previews: PreviewProvider, TestablePreview {
     static let bothSetupViewModel = viewModel(keyBackupState: .enabled, recoveryState: .enabled)
     static let onlyKeyBackupSetUpViewModel = viewModel(keyBackupState: .enabled, recoveryState: .disabled)

ElementX/Sources/Screens/Settings/NotificationSettingsScreen/View/NotificationSettingsScreen.swift

@@ -264,6 +264,7 @@ struct NotificationSettingsScreen: View {
 
 // MARK: - Previews
 
+@available(iOS 26.0, *)
 struct NotificationSettingsScreen_Previews: PreviewProvider, TestablePreview {
     static let viewModel: NotificationSettingsScreenViewModel = {
         let appSettings = AppSettings.volatile()

ElementX/Sources/Screens/Settings/SettingsScreen/View/SettingsScreen.swift

@@ -255,6 +255,7 @@ struct SettingsScreen: View {
 
 // MARK: - Previews
 
+@available(iOS 26.0, *)
 struct SettingsScreen_Previews: PreviewProvider, TestablePreview {
     static let viewModel = makeViewModel()
     static let bugReportDisabledViewModel = makeViewModel(isBugReportServiceEnabled: false)

ElementX/Sources/Screens/Spaces/SpaceAddRoomsScreen/View/SpaceAddRoomsScreen.swift

@@ -157,6 +157,7 @@ private struct SpaceAddRoomsListRow: View {
 
 // MARK: - Previews
 
+@available(iOS 26.0, *)
 struct SpaceAddRoomsScreen_Previews: PreviewProvider, TestablePreview {
     static let summaryProvider = RoomSummaryProviderMock(.init(state: .loaded(.mockRooms)))
     static let viewModel = makeViewModel()

ElementX/Sources/Screens/Spaces/SpaceScreen/View/SpaceScreen.swift

@@ -184,6 +184,7 @@ struct SpaceScreen: View {
 
 // MARK: - Previews
 
+@available(iOS 26.0, *)
 struct SpaceScreen_Previews: PreviewProvider, TestablePreview {
     static let viewModel = makeViewModel()
     static let managingViewModel = makeViewModel(isManagingRooms: true)

ElementX/Sources/Screens/UserProfileScreen/View/UserProfileScreen.swift

@@ -106,6 +106,7 @@ struct UserProfileScreen: View {
 
 // MARK: - Previews
 
+@available(iOS 26.0, *)
 struct UserProfileScreen_Previews: PreviewProvider, TestablePreview {
     static let verifiedUserViewModel = makeViewModel(userID: RoomMemberProxyMock.mockDan.userID)
     static let otherUserViewModel = makeViewModel(userID: RoomMemberProxyMock.mockAlice.userID)

PreviewTests/SupportingFiles/target.yml

@@ -41,6 +41,8 @@ targets:
       base:
         PRODUCT_NAME: PreviewTests
         PRODUCT_BUNDLE_IDENTIFIER: ${BASE_BUNDLE_IDENTIFIER}.preview.tests
+        # Requires iOS 26 as the generated tests reference previews gated to the Observations-based observe(_:).
+        IPHONEOS_DEPLOYMENT_TARGET: '26.0'
         SWIFT_VERSION: 6.2
         SWIFT_APPROACHABLE_CONCURRENCY: YES
         SWIFT_DEFAULT_ACTOR_ISOLATION: MainActor

Tools/Scripts/Templates/SimpleScreenExample/ElementX/View/TemplateScreen.swift

@@ -42,6 +42,7 @@ struct TemplateScreen: View {
 
 // MARK: - Previews
 
+@available(iOS 26.0, *)
 struct TemplateScreen_Previews: PreviewProvider, TestablePreview {
     static let viewModel = makeViewModel()
     static let incrementedViewModel = makeViewModel(counterValue: 1)

Tools/Sourcery/TestablePreviewsDictionary.stencil

@@ -18,11 +18,21 @@ import {{ import }}
 {% endfor %}
 
 enum TestablePreviewsDictionary {
-    static let dictionary: [String: any PreviewProvider.Type] = [
-        {% for type in types.types where (type.implements.TestablePreview or type.based.TestablePreview or type|annotated:"TestablePreview") and type.name != "TestablePreview" %}
-        "{{ type.name }}" : {{ type.name }}.self,
-        {% endfor %}
-    ]
+    static let dictionary: [String: any PreviewProvider.Type] = {
+        var dictionary: [String: any PreviewProvider.Type] = [
+            {% for type in types.types where (type.implements.TestablePreview or type.based.TestablePreview or type|annotated:"TestablePreview") and type.name != "TestablePreview" and not type.attributes.available %}
+            "{{ type.name }}" : {{ type.name }}.self,
+            {% endfor %}
+        ]
+        // Previews carrying an @available attribute (e.g. those observing state through the iOS 26
+        // Observations-based observe(_:)) can't be referenced unconditionally in this iOS 18 target.
+        if #available(iOS 26.0, *) {
+            {% for type in types.types where (type.implements.TestablePreview or type.based.TestablePreview or type|annotated:"TestablePreview") and type.name != "TestablePreview" and type.attributes.available %}
+            dictionary["{{ type.name }}"] = {{ type.name }}.self
+            {% endfor %}
+        }
+        return dictionary
+    }()
  }
 
 // swiftlint:enable all

UnitTests/Sources/NotificationSettingsEditScreenViewModelTests.swift

@@ -112,8 +112,10 @@ struct NotificationSettingsEditScreenViewModelTests {
         
         try await deferred.fulfill()
         
+        #expect(viewModel.context.viewState.pendingMode == nil)
+        
         var deferredViewState = deferFulfillment(viewModel.context.observe(\.viewState.pendingMode),
-                                                 transitionValues: [nil, .allMessages, nil])
+                                                 transitionValues: [.allMessages, nil])
         
         context.send(viewAction: .setMode(.allMessages))
         
@@ -150,8 +152,10 @@ struct NotificationSettingsEditScreenViewModelTests {
         
         try await deferred.fulfill()
         
+        #expect(viewModel.context.viewState.pendingMode == nil)
+        
         var deferredViewState = deferFulfillment(viewModel.context.observe(\.viewState.pendingMode),
-                                                 transitionValues: [nil, .mentionsAndKeywordsOnly, nil])
+                                                 transitionValues: [.mentionsAndKeywordsOnly, nil])
         
         context.send(viewAction: .setMode(.mentionsAndKeywordsOnly))
         
@@ -190,8 +194,10 @@ struct NotificationSettingsEditScreenViewModelTests {
         
         try await deferred.fulfill()
         
+        #expect(viewModel.context.viewState.pendingMode == nil)
+        
         let deferredViewState = deferFulfillment(viewModel.context.observe(\.viewState.pendingMode),
-                                                 transitionValues: [nil, .allMessages, nil])
+                                                 transitionValues: [.allMessages, nil])
         
         context.send(viewAction: .setMode(.allMessages))
         
@@ -222,8 +228,10 @@ struct NotificationSettingsEditScreenViewModelTests {
         
         try await deferred.fulfill()
         
+        #expect(viewModel.context.viewState.pendingMode == nil)
+        
         let deferredViewState = deferFulfillment(viewModel.context.observe(\.viewState.pendingMode),
-                                                 transitionValues: [nil, .allMessages, nil])
+                                                 transitionValues: [.allMessages, nil])
         
         context.send(viewAction: .setMode(.allMessages))
         

UnitTests/Sources/RoomNotificationSettingsScreenViewModelTests.swift

@@ -141,8 +141,10 @@ struct RoomNotificationSettingsScreenViewModelTests {
         notificationSettingsProxyMock.callbacks.send(.settingsDidChange)
         try await deferred.fulfill()
         
+        #expect(viewModel.context.viewState.isRestoringDefaultSetting == false)
+        
         let deferredIsRestoringDefaultSettings = deferFulfillment(viewModel.context.observe(\.viewState.isRestoringDefaultSetting),
-                                                                  transitionValues: [false, true, false])
+                                                                  transitionValues: [true, false])
         
         viewModel.state.bindings.allowCustomSetting = false
         viewModel.context.send(viewAction: .changedAllowCustomSettings)
@@ -200,8 +202,10 @@ struct RoomNotificationSettingsScreenViewModelTests {
         notificationSettingsProxyMock.callbacks.send(.settingsDidChange)
         try await deferred.fulfill()
         
+        #expect(viewModel.context.viewState.pendingCustomMode == nil)
+        
         var deferredMode = deferFulfillment(viewModel.context.observe(\.viewState.pendingCustomMode),
-                                            transitionValues: [nil, .allMessages, nil])
+                                            transitionValues: [.allMessages, nil])
         viewModel.context.send(viewAction: .setCustomMode(.allMessages))
         
         try await deferredMode.fulfill()
@@ -210,8 +214,10 @@ struct RoomNotificationSettingsScreenViewModelTests {
         #expect(notificationSettingsProxyMock.setNotificationModeRoomIdModeReceivedArguments?.1 == .allMessages)
         #expect(notificationSettingsProxyMock.setNotificationModeRoomIdModeCallsCount == 1)
         
+        #expect(viewModel.context.viewState.pendingCustomMode == nil)
+        
         deferredMode = deferFulfillment(viewModel.context.observe(\.viewState.pendingCustomMode),
-                                        transitionValues: [nil, .mute, nil])
+                                        transitionValues: [.mute, nil])
         viewModel.context.send(viewAction: .setCustomMode(.mute))
         
         try await deferredMode.fulfill()
@@ -222,8 +228,10 @@ struct RoomNotificationSettingsScreenViewModelTests {
         
         try await Task.sleep(for: .milliseconds(10)) // Workaround for flaky test
         
+        #expect(viewModel.context.viewState.pendingCustomMode == nil)
+        
         deferredMode = deferFulfillment(viewModel.context.observe(\.viewState.pendingCustomMode),
-                                        transitionValues: [nil, .mentionsAndKeywordsOnly, nil])
+                                        transitionValues: [.mentionsAndKeywordsOnly, nil])
         viewModel.context.send(viewAction: .setCustomMode(.mentionsAndKeywordsOnly))
         
         try await deferredMode.fulfill()

UnitTests/SupportingFiles/target.yml

@@ -45,6 +45,8 @@ targets:
       base:
         PRODUCT_NAME: UnitTests
         PRODUCT_BUNDLE_IDENTIFIER: ${BASE_BUNDLE_IDENTIFIER}.unit.tests
+        # Requires iOS 26 so tests exercise the Observations-based observe(_:) overload.
+        IPHONEOS_DEPLOYMENT_TARGET: '26.0'
         SWIFT_VERSION: 6.2
         SWIFT_APPROACHABLE_CONCURRENCY: YES
         SWIFT_DEFAULT_ACTOR_ISOLATION: MainActor