diff --git a/src/utils.ts b/src/utils.ts
index 4df62bc6..ecb497a7 100644
--- a/src/utils.ts
+++ b/src/utils.ts
@@ -1,3 +1,6 @@
+/**
+ * @internal
+ */
 export const unreachable = (_: never): never => {
   throw new Error("unreachable");
 };
diff --git a/tsconfig.json b/tsconfig.json
index 124bf5c8..a50008a7 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -21,7 +21,8 @@
     "noFallthroughCasesInSwitch": true,
     "allowUnreachableCode": false,
     "allowUnusedLabels": false,
-    "exactOptionalPropertyTypes": true
+    "exactOptionalPropertyTypes": true,
+    "stripInternal": true
   },
   "include": ["src"],
   "exclude": ["node_modules"]