diff --git a/extensions/approval/js/src/@types/shims.d.ts b/extensions/approval/js/src/@types/shims.d.ts
new file mode 100644
index 0000000000..0f4135403c
--- /dev/null
+++ b/extensions/approval/js/src/@types/shims.d.ts
@@ -0,0 +1,12 @@
+declare module 'flarum/common/models/Discussion' {
+  export default interface Discussion {
+    isApproved(): boolean;
+  }
+}
+
+declare module 'flarum/common/models/Post' {
+  export default interface Post {
+    isApproved(): boolean;
+    canApprove(): boolean;
+  }
+}
diff --git a/extensions/likes/js/src/@types/shims.d.ts b/extensions/likes/js/src/@types/shims.d.ts
index fb573ff95e..358a273932 100644
--- a/extensions/likes/js/src/@types/shims.d.ts
+++ b/extensions/likes/js/src/@types/shims.d.ts
@@ -1,9 +1,9 @@
-import Post from 'flarum/common/models/Post';
 import User from 'flarum/common/models/User';
 
 declare module 'flarum/common/models/Post' {
   export default interface Post {
     likes(): User[];
     likesCount(): number;
+    canLike(): boolean;
   }
 }
diff --git a/extensions/lock/js/src/@types/shims.d.ts b/extensions/lock/js/src/@types/shims.d.ts
new file mode 100644
index 0000000000..38375c0792
--- /dev/null
+++ b/extensions/lock/js/src/@types/shims.d.ts
@@ -0,0 +1,6 @@
+declare module 'flarum/common/models/Discussion' {
+  export default interface Discussion {
+    isLocked(): boolean;
+    canLock(): boolean;
+  }
+}
diff --git a/extensions/nicknames/js/src/@types/shims.d.ts b/extensions/nicknames/js/src/@types/shims.d.ts
new file mode 100644
index 0000000000..145fe8e5a3
--- /dev/null
+++ b/extensions/nicknames/js/src/@types/shims.d.ts
@@ -0,0 +1,5 @@
+declare module 'flarum/common/models/User' {
+  export default interface User {
+    canEditNickname(): boolean;
+  }
+}
diff --git a/extensions/sticky/js/src/@types/shims.d.ts b/extensions/sticky/js/src/@types/shims.d.ts
new file mode 100644
index 0000000000..1a589e7429
--- /dev/null
+++ b/extensions/sticky/js/src/@types/shims.d.ts
@@ -0,0 +1,6 @@
+declare module 'flarum/common/models/Discussion' {
+  export default interface Discussion {
+    isSticky(): boolean;
+    canSticky(): boolean;
+  }
+}
diff --git a/extensions/suspend/js/src/@types/shims.d.ts b/extensions/suspend/js/src/@types/shims.d.ts
new file mode 100644
index 0000000000..4cd4d2b6a5
--- /dev/null
+++ b/extensions/suspend/js/src/@types/shims.d.ts
@@ -0,0 +1,8 @@
+declare module 'flarum/common/models/User' {
+  export default interface User {
+    canSuspend(): boolean;
+    suspendedUntil(): Date | string | null | undefined;
+    suspendReason(): string | null | undefined;
+    suspendMessage(): string | null | undefined;
+  }
+}