diff --git a/lib/shared/message-utils.js b/lib/shared/message-utils.js
--- a/lib/shared/message-utils.js
+++ b/lib/shared/message-utils.js
@@ -507,7 +507,7 @@
 
 function isInvalidSidebarSource(
   message: RawMessageInfo | MessageInfo,
-): boolean %checks {
+): boolean {
   return (
     (message.type === messageTypes.REACTION ||
       message.type === messageTypes.EDIT_MESSAGE ||
diff --git a/lib/types/identity-service-types.js b/lib/types/identity-service-types.js
--- a/lib/types/identity-service-types.js
+++ b/lib/types/identity-service-types.js
@@ -374,7 +374,7 @@
 
 export type IdentityDeviceType = $Values<typeof identityDeviceTypes>;
 
-function isIdentityDeviceType(deviceType: number): boolean %checks {
+function isIdentityDeviceType(deviceType: number): boolean {
   return (
     deviceType === 0 ||
     deviceType === 1 ||