diff --git a/config-serializer/assert.ts b/config-serializer/assert.ts
new file mode 100644
index 00000000..7015ba2d
--- /dev/null
+++ b/config-serializer/assert.ts
@@ -0,0 +1,39 @@
+function assertUInt8(target: any, key: string) {
+    let val = this[key];
+    if (delete this[key]) {
+        Object.defineProperty(target, key, {
+            get: function () {
+                return val;
+            },
+            set: function (newVal) {
+                if (newVal < 0 || newVal > 255) {
+                    throw `Invalid ${target.constructor.name}.${key}: ${newVal} is not uint8`;
+                }
+                val = newVal;
+            },
+            enumerable: true,
+            configurable: true
+        });
+    }
+}
+
+function assertEnum<E>(enumerated: E) {
+    return function(target: any, key: string) {
+        let val = this[key];
+        if (delete this[key]) {
+            Object.defineProperty(target, key, {
+                get: function () {
+                    return val;
+                },
+                set: function (newVal) {
+                    if (enumerated[newVal] === undefined) {
+                        throw `Invalid ${target.constructor.name}.${key}: ${newVal} is not enum`;
+                    }
+                    val = newVal;
+                },
+                enumerable: true,
+                configurable: true
+            });
+        }
+    }
+}
diff --git a/config-serializer/config-items/SwitchLayerAction.ts b/config-serializer/config-items/SwitchLayerAction.ts
index 66f2e632..1837baa0 100644
--- a/config-serializer/config-items/SwitchLayerAction.ts
+++ b/config-serializer/config-items/SwitchLayerAction.ts
@@ -1,43 +1,3 @@
-function assertUInt8(target: any, key: string) {
-    let val = this[key];
-    if (delete this[key]) {
-        Object.defineProperty(target, key, {
-            get: function () {
-                return val;
-            },
-            set: function (newVal) {
-                if (newVal < 0 || newVal > 255) {
-                    throw `Invalid ${target.constructor.name}.${key}: ${newVal} is not uint8`;
-                }
-                val = newVal;
-            },
-            enumerable: true,
-            configurable: true
-        });
-    }
-}
-
-function assertEnum<E>(enumerated: E) {
-    return function(target: any, key: string) {
-        let val = this[key];
-        if (delete this[key]) {
-            Object.defineProperty(target, key, {
-                get: function () {
-                    return val;
-                },
-                set: function (newVal) {
-                    if (enumerated[newVal] === undefined) {
-                        throw `Invalid ${target.constructor.name}.${key}: ${newVal} is not enum`;
-                    }
-                    val = newVal;
-                },
-                enumerable: true,
-                configurable: true
-            });
-        }
-    }
-}
-
 enum Layer {
     mod,
     fn,
diff --git a/config-serializer/serializeConfig.ts b/config-serializer/serializeConfig.ts
index 262a4ca0..61610e77 100644
--- a/config-serializer/serializeConfig.ts
+++ b/config-serializer/serializeConfig.ts
@@ -1,3 +1,4 @@
+/// <reference path="assert.ts" />
 /// <reference path="TypeChecker.ts" />
 /// <reference path="Serializable.ts" />
 /// <reference path="UhkBuffer.ts" />