From c7138183bb6a573029016ae4cf655a37f4d29b35 Mon Sep 17 00:00:00 2001
From: Chris Pinola <chris@pinola.co>
Date: Thu, 11 Jun 2020 13:25:37 -0400
Subject: [PATCH 1/2] Prevent config.parse() output from being used as input

---
 packages/core/src/config.ts | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/packages/core/src/config.ts b/packages/core/src/config.ts
index 886a355f..fd43aaf5 100644
--- a/packages/core/src/config.ts
+++ b/packages/core/src/config.ts
@@ -66,6 +66,13 @@ export function parse<T>(TRoot: IClassType<T>, actual: any, base?: Partial<T>):
         }
     }
 
+    if (isSection(actual)) {
+        throw new Error(
+            "The value of `actual` has no enumerable properties. Make sure the object being " +
+                "passed is not the output of `config.parse<T>()` (i.e. does not have the '@section' decorator)."
+        );
+    }
+
     const instance = new TRoot();
     if (verifyIsSection(instance)) {
         const config: T & ISection = new TRoot() as any;
@@ -303,8 +310,12 @@ interface ISection {
     readonly __extensible?: boolean;
 }
 
+function isSection(obj: any): obj is ISection {
+    return obj && obj.__assignedProperties;
+}
+
 function verifyIsSection(obj: any): obj is ISection {
-    if (obj && obj.__assignedProperties) {
+    if (isSection(obj)) {
         return true;
     }
 

From ce95c3e94af8c2a08a1c7acd0e3261e035a30b96 Mon Sep 17 00:00:00 2001
From: Chris Pinola <chris@pinola.co>
Date: Thu, 11 Jun 2020 13:26:02 -0400
Subject: [PATCH 2/2] Bump package version

---
 packages/core/package.json | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/packages/core/package.json b/packages/core/package.json
index 6952f2e3..abb5a6f0 100644
--- a/packages/core/package.json
+++ b/packages/core/package.json
@@ -1,6 +1,6 @@
 {
     "name": "@walmartlabs/cookie-cutter-core",
-    "version": "1.3.0-beta.4",
+    "version": "1.3.0-beta.5",
     "license": "Apache-2.0",
     "main": "dist/index.js",
     "types": "dist/index.d.ts",