diff --git a/extensions/suspend/js/package.json b/extensions/suspend/js/package.json
index a0e4f998f4..0604c0d52e 100644
--- a/extensions/suspend/js/package.json
+++ b/extensions/suspend/js/package.json
@@ -6,9 +6,14 @@
     "scripts": {
         "dev": "webpack --mode development --watch",
         "build": "webpack --mode production",
-        "format": "prettier --write src",
         "analyze": "cross-env ANALYZER=true yarn run build",
-        "format-check": "prettier --check src"
+        "format": "prettier --write src",
+        "format-check": "prettier --check src",
+        "clean-typings": "npx rimraf dist-typings && mkdir dist-typings",
+        "build-typings": "yarn run clean-typings && ([ -e src/@types ] && cp -r src/@types dist-typings/@types || true) && tsc && yarn run post-build-typings",
+        "post-build-typings": "find dist-typings -type f -name '*.d.ts' -print0 | xargs -0 sed -i 's,../src/@types,@types,g'",
+        "check-typings": "tsc --noEmit --emitDeclarationOnly false",
+        "check-typings-coverage": "typescript-coverage-report"
     },
     "devDependencies": {
         "@flarum/prettier-config": "^1.0.0",
@@ -16,6 +21,7 @@
         "flarum-webpack-config": "^2.0.0",
         "prettier": "^2.5.1",
         "webpack": "^5.76.0",
-        "webpack-cli": "^4.9.1"
+        "webpack-cli": "^4.9.1",
+        "typescript-coverage-report": "^0.6.1"
     }
 }
diff --git a/extensions/suspend/js/src/forum/extend.ts b/extensions/suspend/js/src/forum/extend.ts
index 6fd80fc861..de0d7570ad 100644
--- a/extensions/suspend/js/src/forum/extend.ts
+++ b/extensions/suspend/js/src/forum/extend.ts
@@ -5,7 +5,7 @@ import Model from 'flarum/common/Model';
 export default [
   new Extend.Model(User)
     .attribute<boolean>('canSuspend')
-    .attribute<Date, string | null | undefined>('suspendedUntil', Model.transformDate)
+    .attribute<Date | null, string | null>('suspendedUntil', Model.transformDate)
     .attribute<string | null | undefined>('suspendReason')
     .attribute<string | null | undefined>('suspendMessage'),
 ];