diff --git a/src/applications/almanac/storage/AlmanacBindingTransaction.php b/src/applications/almanac/storage/AlmanacBindingTransaction.php
--- a/src/applications/almanac/storage/AlmanacBindingTransaction.php
+++ b/src/applications/almanac/storage/AlmanacBindingTransaction.php
@@ -8,7 +8,7 @@
   }
 
   public function getBaseTransactionClass() {
-    return 'AlmanacBindingTransactionType';
+    return AlmanacBindingTransactionType::class;
   }
 
 }
diff --git a/src/applications/almanac/storage/AlmanacDeviceTransaction.php b/src/applications/almanac/storage/AlmanacDeviceTransaction.php
--- a/src/applications/almanac/storage/AlmanacDeviceTransaction.php
+++ b/src/applications/almanac/storage/AlmanacDeviceTransaction.php
@@ -8,7 +8,7 @@
   }
 
   public function getBaseTransactionClass() {
-    return 'AlmanacDeviceTransactionType';
+    return AlmanacDeviceTransactionType::class;
   }
 
 }
diff --git a/src/applications/almanac/storage/AlmanacInterfaceTransaction.php b/src/applications/almanac/storage/AlmanacInterfaceTransaction.php
--- a/src/applications/almanac/storage/AlmanacInterfaceTransaction.php
+++ b/src/applications/almanac/storage/AlmanacInterfaceTransaction.php
@@ -8,7 +8,7 @@
   }
 
   public function getBaseTransactionClass() {
-    return 'AlmanacInterfaceTransactionType';
+    return AlmanacInterfaceTransactionType::class;
   }
 
 }
diff --git a/src/applications/almanac/storage/AlmanacNamespaceTransaction.php b/src/applications/almanac/storage/AlmanacNamespaceTransaction.php
--- a/src/applications/almanac/storage/AlmanacNamespaceTransaction.php
+++ b/src/applications/almanac/storage/AlmanacNamespaceTransaction.php
@@ -8,7 +8,7 @@
   }
 
   public function getBaseTransactionClass() {
-    return 'AlmanacNamespaceTransactionType';
+    return AlmanacNamespaceTransactionType::class;
   }
 
 }
diff --git a/src/applications/almanac/storage/AlmanacNetworkTransaction.php b/src/applications/almanac/storage/AlmanacNetworkTransaction.php
--- a/src/applications/almanac/storage/AlmanacNetworkTransaction.php
+++ b/src/applications/almanac/storage/AlmanacNetworkTransaction.php
@@ -8,7 +8,7 @@
   }
 
   public function getBaseTransactionClass() {
-    return 'AlmanacNetworkTransactionType';
+    return AlmanacNetworkTransactionType::class;
   }
 
 }
diff --git a/src/applications/almanac/storage/AlmanacServiceTransaction.php b/src/applications/almanac/storage/AlmanacServiceTransaction.php
--- a/src/applications/almanac/storage/AlmanacServiceTransaction.php
+++ b/src/applications/almanac/storage/AlmanacServiceTransaction.php
@@ -8,7 +8,7 @@
   }
 
   public function getBaseTransactionClass() {
-    return 'AlmanacServiceTransactionType';
+    return AlmanacServiceTransactionType::class;
   }
 
 }
diff --git a/src/applications/audit/storage/PhabricatorAuditTransaction.php b/src/applications/audit/storage/PhabricatorAuditTransaction.php
--- a/src/applications/audit/storage/PhabricatorAuditTransaction.php
+++ b/src/applications/audit/storage/PhabricatorAuditTransaction.php
@@ -21,7 +21,7 @@
   }
 
   public function getBaseTransactionClass() {
-    return 'DiffusionCommitTransactionType';
+    return DiffusionCommitTransactionType::class;
   }
 
   public function getApplicationTransactionType() {
diff --git a/src/applications/auth/storage/PhabricatorAuthContactNumberTransaction.php b/src/applications/auth/storage/PhabricatorAuthContactNumberTransaction.php
--- a/src/applications/auth/storage/PhabricatorAuthContactNumberTransaction.php
+++ b/src/applications/auth/storage/PhabricatorAuthContactNumberTransaction.php
@@ -12,7 +12,7 @@
   }
 
   public function getBaseTransactionClass() {
-    return 'PhabricatorAuthContactNumberTransactionType';
+    return PhabricatorAuthContactNumberTransactionType::class;
   }
 
 }
diff --git a/src/applications/auth/storage/PhabricatorAuthFactorProviderTransaction.php b/src/applications/auth/storage/PhabricatorAuthFactorProviderTransaction.php
--- a/src/applications/auth/storage/PhabricatorAuthFactorProviderTransaction.php
+++ b/src/applications/auth/storage/PhabricatorAuthFactorProviderTransaction.php
@@ -12,7 +12,7 @@
   }
 
   public function getBaseTransactionClass() {
-    return 'PhabricatorAuthFactorProviderTransactionType';
+    return PhabricatorAuthFactorProviderTransactionType::class;
   }
 
 }
diff --git a/src/applications/auth/storage/PhabricatorAuthMessageTransaction.php b/src/applications/auth/storage/PhabricatorAuthMessageTransaction.php
--- a/src/applications/auth/storage/PhabricatorAuthMessageTransaction.php
+++ b/src/applications/auth/storage/PhabricatorAuthMessageTransaction.php
@@ -12,7 +12,7 @@
   }
 
   public function getBaseTransactionClass() {
-    return 'PhabricatorAuthMessageTransactionType';
+    return PhabricatorAuthMessageTransactionType::class;
   }
 
 }
diff --git a/src/applications/auth/storage/PhabricatorAuthPasswordTransaction.php b/src/applications/auth/storage/PhabricatorAuthPasswordTransaction.php
--- a/src/applications/auth/storage/PhabricatorAuthPasswordTransaction.php
+++ b/src/applications/auth/storage/PhabricatorAuthPasswordTransaction.php
@@ -12,6 +12,6 @@
   }
 
   public function getBaseTransactionClass() {
-    return 'PhabricatorAuthPasswordTransactionType';
+    return PhabricatorAuthPasswordTransactionType::class;
   }
 }
diff --git a/src/applications/badges/storage/PhabricatorBadgesTransaction.php b/src/applications/badges/storage/PhabricatorBadgesTransaction.php
--- a/src/applications/badges/storage/PhabricatorBadgesTransaction.php
+++ b/src/applications/badges/storage/PhabricatorBadgesTransaction.php
@@ -20,7 +20,7 @@
   }
 
   public function getBaseTransactionClass() {
-    return 'PhabricatorBadgesBadgeTransactionType';
+    return PhabricatorBadgesBadgeTransactionType::class;
   }
 
   public function getMailTags() {
diff --git a/src/applications/calendar/storage/PhabricatorCalendarEventTransaction.php b/src/applications/calendar/storage/PhabricatorCalendarEventTransaction.php
--- a/src/applications/calendar/storage/PhabricatorCalendarEventTransaction.php
+++ b/src/applications/calendar/storage/PhabricatorCalendarEventTransaction.php
@@ -20,7 +20,7 @@
   }
 
   public function getBaseTransactionClass() {
-    return 'PhabricatorCalendarEventTransactionType';
+    return PhabricatorCalendarEventTransactionType::class;
   }
 
   public function getMailTags() {
diff --git a/src/applications/calendar/storage/PhabricatorCalendarExportTransaction.php b/src/applications/calendar/storage/PhabricatorCalendarExportTransaction.php
--- a/src/applications/calendar/storage/PhabricatorCalendarExportTransaction.php
+++ b/src/applications/calendar/storage/PhabricatorCalendarExportTransaction.php
@@ -12,7 +12,7 @@
   }
 
   public function getBaseTransactionClass() {
-    return 'PhabricatorCalendarExportTransactionType';
+    return PhabricatorCalendarExportTransactionType::class;
   }
 
 }
diff --git a/src/applications/calendar/storage/PhabricatorCalendarImportTransaction.php b/src/applications/calendar/storage/PhabricatorCalendarImportTransaction.php
--- a/src/applications/calendar/storage/PhabricatorCalendarImportTransaction.php
+++ b/src/applications/calendar/storage/PhabricatorCalendarImportTransaction.php
@@ -12,7 +12,7 @@
   }
 
   public function getBaseTransactionClass() {
-    return 'PhabricatorCalendarImportTransactionType';
+    return PhabricatorCalendarImportTransactionType::class;
   }
 
 }
diff --git a/src/applications/conpherence/storage/ConpherenceTransaction.php b/src/applications/conpherence/storage/ConpherenceTransaction.php
--- a/src/applications/conpherence/storage/ConpherenceTransaction.php
+++ b/src/applications/conpherence/storage/ConpherenceTransaction.php
@@ -16,7 +16,7 @@
   }
 
   public function getBaseTransactionClass() {
-    return 'ConpherenceThreadTransactionType';
+    return ConpherenceThreadTransactionType::class;
   }
 
 }
diff --git a/src/applications/countdown/storage/PhabricatorCountdownTransaction.php b/src/applications/countdown/storage/PhabricatorCountdownTransaction.php
--- a/src/applications/countdown/storage/PhabricatorCountdownTransaction.php
+++ b/src/applications/countdown/storage/PhabricatorCountdownTransaction.php
@@ -20,7 +20,7 @@
   }
 
   public function getBaseTransactionClass() {
-    return 'PhabricatorCountdownTransactionType';
+    return PhabricatorCountdownTransactionType::class;
   }
 
   public function getMailTags() {
diff --git a/src/applications/dashboard/storage/PhabricatorDashboardPanelTransaction.php b/src/applications/dashboard/storage/PhabricatorDashboardPanelTransaction.php
--- a/src/applications/dashboard/storage/PhabricatorDashboardPanelTransaction.php
+++ b/src/applications/dashboard/storage/PhabricatorDashboardPanelTransaction.php
@@ -12,7 +12,7 @@
   }
 
   public function getBaseTransactionClass() {
-    return 'PhabricatorDashboardPanelTransactionType';
+    return PhabricatorDashboardPanelTransactionType::class;
   }
 
 }
diff --git a/src/applications/dashboard/storage/PhabricatorDashboardPortalTransaction.php b/src/applications/dashboard/storage/PhabricatorDashboardPortalTransaction.php
--- a/src/applications/dashboard/storage/PhabricatorDashboardPortalTransaction.php
+++ b/src/applications/dashboard/storage/PhabricatorDashboardPortalTransaction.php
@@ -12,7 +12,7 @@
   }
 
   public function getBaseTransactionClass() {
-    return 'PhabricatorDashboardPortalTransactionType';
+    return PhabricatorDashboardPortalTransactionType::class;
   }
 
 }
diff --git a/src/applications/dashboard/storage/PhabricatorDashboardTransaction.php b/src/applications/dashboard/storage/PhabricatorDashboardTransaction.php
--- a/src/applications/dashboard/storage/PhabricatorDashboardTransaction.php
+++ b/src/applications/dashboard/storage/PhabricatorDashboardTransaction.php
@@ -12,7 +12,7 @@
   }
 
   public function getBaseTransactionClass() {
-    return 'PhabricatorDashboardTransactionType';
+    return PhabricatorDashboardTransactionType::class;
   }
 
 }
diff --git a/src/applications/differential/storage/DifferentialTransaction.php b/src/applications/differential/storage/DifferentialTransaction.php
--- a/src/applications/differential/storage/DifferentialTransaction.php
+++ b/src/applications/differential/storage/DifferentialTransaction.php
@@ -17,7 +17,7 @@
   const MAILTAG_OTHER          = 'differential-other';
 
   public function getBaseTransactionClass() {
-    return 'DifferentialRevisionTransactionType';
+    return DifferentialRevisionTransactionType::class;
   }
 
   protected function newFallbackModularTransactionType() {
diff --git a/src/applications/drydock/storage/DrydockBlueprintTransaction.php b/src/applications/drydock/storage/DrydockBlueprintTransaction.php
--- a/src/applications/drydock/storage/DrydockBlueprintTransaction.php
+++ b/src/applications/drydock/storage/DrydockBlueprintTransaction.php
@@ -15,7 +15,7 @@
   }
 
   public function getBaseTransactionClass() {
-    return 'DrydockBlueprintTransactionType';
+    return DrydockBlueprintTransactionType::class;
   }
 
 }
diff --git a/src/applications/files/storage/PhabricatorFileTransaction.php b/src/applications/files/storage/PhabricatorFileTransaction.php
--- a/src/applications/files/storage/PhabricatorFileTransaction.php
+++ b/src/applications/files/storage/PhabricatorFileTransaction.php
@@ -16,7 +16,7 @@
   }
 
   public function getBaseTransactionClass() {
-    return 'PhabricatorFileTransactionType';
+    return PhabricatorFileTransactionType::class;
   }
 
 }
diff --git a/src/applications/harbormaster/storage/HarbormasterBuildTransaction.php b/src/applications/harbormaster/storage/HarbormasterBuildTransaction.php
--- a/src/applications/harbormaster/storage/HarbormasterBuildTransaction.php
+++ b/src/applications/harbormaster/storage/HarbormasterBuildTransaction.php
@@ -12,7 +12,7 @@
   }
 
   public function getBaseTransactionClass() {
-    return 'HarbormasterBuildTransactionType';
+    return HarbormasterBuildTransactionType::class;
   }
 
 }
diff --git a/src/applications/harbormaster/storage/HarbormasterBuildableTransaction.php b/src/applications/harbormaster/storage/HarbormasterBuildableTransaction.php
--- a/src/applications/harbormaster/storage/HarbormasterBuildableTransaction.php
+++ b/src/applications/harbormaster/storage/HarbormasterBuildableTransaction.php
@@ -12,7 +12,7 @@
   }
 
   public function getBaseTransactionClass() {
-    return 'HarbormasterBuildableTransactionType';
+    return HarbormasterBuildableTransactionType::class;
   }
 
 }
diff --git a/src/applications/herald/storage/HeraldRuleTransaction.php b/src/applications/herald/storage/HeraldRuleTransaction.php
--- a/src/applications/herald/storage/HeraldRuleTransaction.php
+++ b/src/applications/herald/storage/HeraldRuleTransaction.php
@@ -14,7 +14,7 @@
   }
 
   public function getBaseTransactionClass() {
-    return 'HeraldRuleTransactionType';
+    return HeraldRuleTransactionType::class;
   }
 
 }
diff --git a/src/applications/herald/storage/HeraldWebhookTransaction.php b/src/applications/herald/storage/HeraldWebhookTransaction.php
--- a/src/applications/herald/storage/HeraldWebhookTransaction.php
+++ b/src/applications/herald/storage/HeraldWebhookTransaction.php
@@ -12,7 +12,7 @@
   }
 
   public function getBaseTransactionClass() {
-    return 'HeraldWebhookTransactionType';
+    return HeraldWebhookTransactionType::class;
   }
 
 }
diff --git a/src/applications/legalpad/storage/LegalpadTransaction.php b/src/applications/legalpad/storage/LegalpadTransaction.php
--- a/src/applications/legalpad/storage/LegalpadTransaction.php
+++ b/src/applications/legalpad/storage/LegalpadTransaction.php
@@ -15,7 +15,7 @@
   }
 
   public function getBaseTransactionClass() {
-    return 'LegalpadDocumentTransactionType';
+    return LegalpadDocumentTransactionType::class;
   }
 
 }
diff --git a/src/applications/macro/storage/PhabricatorMacroTransaction.php b/src/applications/macro/storage/PhabricatorMacroTransaction.php
--- a/src/applications/macro/storage/PhabricatorMacroTransaction.php
+++ b/src/applications/macro/storage/PhabricatorMacroTransaction.php
@@ -20,7 +20,7 @@
   }
 
   public function getBaseTransactionClass() {
-    return 'PhabricatorMacroTransactionType';
+    return PhabricatorMacroTransactionType::class;
   }
 
 
diff --git a/src/applications/maniphest/storage/ManiphestTransaction.php b/src/applications/maniphest/storage/ManiphestTransaction.php
--- a/src/applications/maniphest/storage/ManiphestTransaction.php
+++ b/src/applications/maniphest/storage/ManiphestTransaction.php
@@ -27,7 +27,7 @@
   }
 
   public function getBaseTransactionClass() {
-    return 'ManiphestTaskTransactionType';
+    return ManiphestTaskTransactionType::class;
   }
 
   public function shouldGenerateOldValue() {
diff --git a/src/applications/meta/storage/PhabricatorApplicationApplicationTransaction.php b/src/applications/meta/storage/PhabricatorApplicationApplicationTransaction.php
--- a/src/applications/meta/storage/PhabricatorApplicationApplicationTransaction.php
+++ b/src/applications/meta/storage/PhabricatorApplicationApplicationTransaction.php
@@ -12,7 +12,7 @@
   }
 
   public function getBaseTransactionClass() {
-    return 'PhabricatorApplicationTransactionType';
+    return PhabricatorApplicationTransactionType::class;
   }
 
 }
diff --git a/src/applications/nuance/storage/NuanceItemTransaction.php b/src/applications/nuance/storage/NuanceItemTransaction.php
--- a/src/applications/nuance/storage/NuanceItemTransaction.php
+++ b/src/applications/nuance/storage/NuanceItemTransaction.php
@@ -14,7 +14,7 @@
   }
 
   public function getBaseTransactionClass() {
-    return 'NuanceItemTransactionType';
+    return NuanceItemTransactionType::class;
   }
 
 }
diff --git a/src/applications/nuance/storage/NuanceQueueTransaction.php b/src/applications/nuance/storage/NuanceQueueTransaction.php
--- a/src/applications/nuance/storage/NuanceQueueTransaction.php
+++ b/src/applications/nuance/storage/NuanceQueueTransaction.php
@@ -11,7 +11,7 @@
   }
 
   public function getBaseTransactionClass() {
-    return 'NuanceQueueTransactionType';
+    return NuanceQueueTransactionType::class;
   }
 
 }
diff --git a/src/applications/nuance/storage/NuanceSourceTransaction.php b/src/applications/nuance/storage/NuanceSourceTransaction.php
--- a/src/applications/nuance/storage/NuanceSourceTransaction.php
+++ b/src/applications/nuance/storage/NuanceSourceTransaction.php
@@ -12,7 +12,7 @@
   }
 
   public function getBaseTransactionClass() {
-    return 'NuanceSourceTransactionType';
+    return NuanceSourceTransactionType::class;
   }
 
 }
diff --git a/src/applications/owners/storage/PhabricatorOwnersPackageTransaction.php b/src/applications/owners/storage/PhabricatorOwnersPackageTransaction.php
--- a/src/applications/owners/storage/PhabricatorOwnersPackageTransaction.php
+++ b/src/applications/owners/storage/PhabricatorOwnersPackageTransaction.php
@@ -12,7 +12,7 @@
   }
 
   public function getBaseTransactionClass() {
-    return 'PhabricatorOwnersPackageTransactionType';
+    return PhabricatorOwnersPackageTransactionType::class;
   }
 
 }
diff --git a/src/applications/packages/storage/PhabricatorPackagesPackageTransaction.php b/src/applications/packages/storage/PhabricatorPackagesPackageTransaction.php
--- a/src/applications/packages/storage/PhabricatorPackagesPackageTransaction.php
+++ b/src/applications/packages/storage/PhabricatorPackagesPackageTransaction.php
@@ -12,7 +12,7 @@
   }
 
   public function getBaseTransactionClass() {
-    return 'PhabricatorPackagesPackageTransactionType';
+    return PhabricatorPackagesPackageTransactionType::class;
   }
 
 }
diff --git a/src/applications/packages/storage/PhabricatorPackagesPublisherTransaction.php b/src/applications/packages/storage/PhabricatorPackagesPublisherTransaction.php
--- a/src/applications/packages/storage/PhabricatorPackagesPublisherTransaction.php
+++ b/src/applications/packages/storage/PhabricatorPackagesPublisherTransaction.php
@@ -12,7 +12,7 @@
   }
 
   public function getBaseTransactionClass() {
-    return 'PhabricatorPackagesPublisherTransactionType';
+    return PhabricatorPackagesPublisherTransactionType::class;
   }
 
 }
diff --git a/src/applications/packages/storage/PhabricatorPackagesVersionTransaction.php b/src/applications/packages/storage/PhabricatorPackagesVersionTransaction.php
--- a/src/applications/packages/storage/PhabricatorPackagesVersionTransaction.php
+++ b/src/applications/packages/storage/PhabricatorPackagesVersionTransaction.php
@@ -12,7 +12,7 @@
   }
 
   public function getBaseTransactionClass() {
-    return 'PhabricatorPackagesVersionTransactionType';
+    return PhabricatorPackagesVersionTransactionType::class;
   }
 
 }
diff --git a/src/applications/passphrase/storage/PassphraseCredentialTransaction.php b/src/applications/passphrase/storage/PassphraseCredentialTransaction.php
--- a/src/applications/passphrase/storage/PassphraseCredentialTransaction.php
+++ b/src/applications/passphrase/storage/PassphraseCredentialTransaction.php
@@ -12,7 +12,7 @@
   }
 
   public function getBaseTransactionClass() {
-    return 'PassphraseCredentialTransactionType';
+    return PassphraseCredentialTransactionType::class;
   }
 
 }
diff --git a/src/applications/paste/storage/PhabricatorPasteTransaction.php b/src/applications/paste/storage/PhabricatorPasteTransaction.php
--- a/src/applications/paste/storage/PhabricatorPasteTransaction.php
+++ b/src/applications/paste/storage/PhabricatorPasteTransaction.php
@@ -20,7 +20,7 @@
   }
 
   public function getBaseTransactionClass() {
-    return 'PhabricatorPasteTransactionType';
+    return PhabricatorPasteTransactionType::class;
   }
 
   public function getMailTags() {
diff --git a/src/applications/people/storage/PhabricatorUserTransaction.php b/src/applications/people/storage/PhabricatorUserTransaction.php
--- a/src/applications/people/storage/PhabricatorUserTransaction.php
+++ b/src/applications/people/storage/PhabricatorUserTransaction.php
@@ -12,7 +12,7 @@
   }
 
   public function getBaseTransactionClass() {
-    return 'PhabricatorUserTransactionType';
+    return PhabricatorUserTransactionType::class;
   }
 
 }
diff --git a/src/applications/phame/storage/PhameBlogTransaction.php b/src/applications/phame/storage/PhameBlogTransaction.php
--- a/src/applications/phame/storage/PhameBlogTransaction.php
+++ b/src/applications/phame/storage/PhameBlogTransaction.php
@@ -16,7 +16,7 @@
   }
 
   public function getBaseTransactionClass() {
-    return 'PhameBlogTransactionType';
+    return PhameBlogTransactionType::class;
   }
 
   public function getMailTags() {
diff --git a/src/applications/phame/storage/PhamePostTransaction.php b/src/applications/phame/storage/PhamePostTransaction.php
--- a/src/applications/phame/storage/PhamePostTransaction.php
+++ b/src/applications/phame/storage/PhamePostTransaction.php
@@ -17,7 +17,7 @@
   }
 
   public function getBaseTransactionClass() {
-    return 'PhamePostTransactionType';
+    return PhamePostTransactionType::class;
   }
 
   public function getApplicationTransactionCommentObject() {
diff --git a/src/applications/pholio/storage/PholioTransaction.php b/src/applications/pholio/storage/PholioTransaction.php
--- a/src/applications/pholio/storage/PholioTransaction.php
+++ b/src/applications/pholio/storage/PholioTransaction.php
@@ -12,7 +12,7 @@
   }
 
   public function getBaseTransactionClass() {
-    return 'PholioTransactionType';
+    return PholioTransactionType::class;
   }
 
   public function getApplicationTransactionType() {
diff --git a/src/applications/phriction/storage/PhrictionTransaction.php b/src/applications/phriction/storage/PhrictionTransaction.php
--- a/src/applications/phriction/storage/PhrictionTransaction.php
+++ b/src/applications/phriction/storage/PhrictionTransaction.php
@@ -22,7 +22,7 @@
   }
 
   public function getBaseTransactionClass() {
-    return 'PhrictionDocumentTransactionType';
+    return PhrictionDocumentTransactionType::class;
   }
 
   public function getRequiredHandlePHIDs() {
diff --git a/src/applications/phurl/storage/PhabricatorPhurlURLTransaction.php b/src/applications/phurl/storage/PhabricatorPhurlURLTransaction.php
--- a/src/applications/phurl/storage/PhabricatorPhurlURLTransaction.php
+++ b/src/applications/phurl/storage/PhabricatorPhurlURLTransaction.php
@@ -18,7 +18,7 @@
   }
 
   public function getBaseTransactionClass() {
-    return 'PhabricatorPhurlURLTransactionType';
+    return PhabricatorPhurlURLTransactionType::class;
   }
 
   public function getRequiredHandlePHIDs() {
diff --git a/src/applications/ponder/storage/PonderAnswerTransaction.php b/src/applications/ponder/storage/PonderAnswerTransaction.php
--- a/src/applications/ponder/storage/PonderAnswerTransaction.php
+++ b/src/applications/ponder/storage/PonderAnswerTransaction.php
@@ -20,7 +20,7 @@
   }
 
   public function getBaseTransactionClass() {
-    return 'PonderAnswerTransactionType';
+    return PonderAnswerTransactionType::class;
   }
 
   public function getMailTags() {
diff --git a/src/applications/ponder/storage/PonderQuestionTransaction.php b/src/applications/ponder/storage/PonderQuestionTransaction.php
--- a/src/applications/ponder/storage/PonderQuestionTransaction.php
+++ b/src/applications/ponder/storage/PonderQuestionTransaction.php
@@ -25,7 +25,7 @@
   }
 
   public function getBaseTransactionClass() {
-    return 'PonderQuestionTransactionType';
+    return PonderQuestionTransactionType::class;
   }
 
   public function getMailTags() {
diff --git a/src/applications/project/storage/PhabricatorProjectColumnTransaction.php b/src/applications/project/storage/PhabricatorProjectColumnTransaction.php
--- a/src/applications/project/storage/PhabricatorProjectColumnTransaction.php
+++ b/src/applications/project/storage/PhabricatorProjectColumnTransaction.php
@@ -12,7 +12,7 @@
   }
 
   public function getBaseTransactionClass() {
-    return 'PhabricatorProjectColumnTransactionType';
+    return PhabricatorProjectColumnTransactionType::class;
   }
 
 }
diff --git a/src/applications/project/storage/PhabricatorProjectTransaction.php b/src/applications/project/storage/PhabricatorProjectTransaction.php
--- a/src/applications/project/storage/PhabricatorProjectTransaction.php
+++ b/src/applications/project/storage/PhabricatorProjectTransaction.php
@@ -20,7 +20,7 @@
   }
 
   public function getBaseTransactionClass() {
-    return 'PhabricatorProjectTransactionType';
+    return PhabricatorProjectTransactionType::class;
   }
 
   public function getRequiredHandlePHIDs() {
diff --git a/src/applications/project/storage/PhabricatorProjectTriggerTransaction.php b/src/applications/project/storage/PhabricatorProjectTriggerTransaction.php
--- a/src/applications/project/storage/PhabricatorProjectTriggerTransaction.php
+++ b/src/applications/project/storage/PhabricatorProjectTriggerTransaction.php
@@ -12,7 +12,7 @@
   }
 
   public function getBaseTransactionClass() {
-    return 'PhabricatorProjectTriggerTransactionType';
+    return PhabricatorProjectTriggerTransactionType::class;
   }
 
 }
diff --git a/src/applications/repository/storage/PhabricatorRepositoryIdentityTransaction.php b/src/applications/repository/storage/PhabricatorRepositoryIdentityTransaction.php
--- a/src/applications/repository/storage/PhabricatorRepositoryIdentityTransaction.php
+++ b/src/applications/repository/storage/PhabricatorRepositoryIdentityTransaction.php
@@ -8,7 +8,7 @@
   }
 
   public function getBaseTransactionClass() {
-    return 'PhabricatorRepositoryIdentityTransactionType';
+    return PhabricatorRepositoryIdentityTransactionType::class;
   }
 
   public function getApplicationName() {
diff --git a/src/applications/repository/storage/PhabricatorRepositoryTransaction.php b/src/applications/repository/storage/PhabricatorRepositoryTransaction.php
--- a/src/applications/repository/storage/PhabricatorRepositoryTransaction.php
+++ b/src/applications/repository/storage/PhabricatorRepositoryTransaction.php
@@ -12,7 +12,7 @@
   }
 
   public function getBaseTransactionClass() {
-    return 'PhabricatorRepositoryTransactionType';
+    return PhabricatorRepositoryTransactionType::class;
   }
 
 }
diff --git a/src/applications/slowvote/storage/PhabricatorSlowvoteTransaction.php b/src/applications/slowvote/storage/PhabricatorSlowvoteTransaction.php
--- a/src/applications/slowvote/storage/PhabricatorSlowvoteTransaction.php
+++ b/src/applications/slowvote/storage/PhabricatorSlowvoteTransaction.php
@@ -20,7 +20,7 @@
   }
 
   public function getBaseTransactionClass() {
-    return 'PhabricatorSlowvoteTransactionType';
+    return PhabricatorSlowvoteTransactionType::class;
   }
 
   public function getMailTags() {
diff --git a/src/applications/spaces/storage/PhabricatorSpacesNamespaceTransaction.php b/src/applications/spaces/storage/PhabricatorSpacesNamespaceTransaction.php
--- a/src/applications/spaces/storage/PhabricatorSpacesNamespaceTransaction.php
+++ b/src/applications/spaces/storage/PhabricatorSpacesNamespaceTransaction.php
@@ -12,7 +12,7 @@
   }
 
   public function getBaseTransactionClass() {
-    return 'PhabricatorSpacesNamespaceTransactionType';
+    return PhabricatorSpacesNamespaceTransactionType::class;
   }
 
 }
diff --git a/src/applications/transactions/storage/PhabricatorEditEngineConfigurationTransaction.php b/src/applications/transactions/storage/PhabricatorEditEngineConfigurationTransaction.php
--- a/src/applications/transactions/storage/PhabricatorEditEngineConfigurationTransaction.php
+++ b/src/applications/transactions/storage/PhabricatorEditEngineConfigurationTransaction.php
@@ -12,7 +12,7 @@
   }
 
   public function getBaseTransactionClass() {
-    return 'PhabricatorEditEngineTransactionType';
+    return PhabricatorEditEngineTransactionType::class;
   }
 
 }
diff --git a/src/applications/harbormaster/storage/configuration/HarbormasterBuildPlanTransaction.php b/src/applications/harbormaster/storage/configuration/HarbormasterBuildPlanTransaction.php
--- a/src/applications/harbormaster/storage/configuration/HarbormasterBuildPlanTransaction.php
+++ b/src/applications/harbormaster/storage/configuration/HarbormasterBuildPlanTransaction.php
@@ -12,7 +12,7 @@
   }
 
   public function getBaseTransactionClass() {
-    return 'HarbormasterBuildPlanTransactionType';
+    return HarbormasterBuildPlanTransactionType::class;
   }
 
 }