From 0fb61bbb762c877f1b2a8b4a6042fff8fee60fbd Mon Sep 17 00:00:00 2001
From: Daniele Debernardi <daniele.debernardi@neolution.ch>
Date: Tue, 29 Jul 2025 11:41:28 +0200
Subject: [PATCH 1/2] Fix convertNullToUndefined

---
 CHANGELOG.md           |  4 ++++
 src/lib/object.spec.ts |  6 ++++++
 src/lib/object.ts      | 14 +++++++++++---
 3 files changed, 21 insertions(+), 3 deletions(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index bdb4e0d..16e7386 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -15,6 +15,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 - UMD build format from Rollup config
 
+### Fixed
+
+- `convertNullToUndefined` is now handling arrays properly
+
 ## [1.5.0] - 2025-07-07
 
 ### Added
diff --git a/src/lib/object.spec.ts b/src/lib/object.spec.ts
index 66699d4..09c538d 100644
--- a/src/lib/object.spec.ts
+++ b/src/lib/object.spec.ts
@@ -36,6 +36,12 @@ describe("object tests", () => {
     [{ hello: null }, {}],
     [{ hello: "world", other: null }, { hello: "world" }],
     [{ nested: { prop1: "test", prop2: null } }, { nested: { prop1: "test" } }],
+    [{ nested: [{ prop1: "test", prop2: null }] }, { nested: [{ prop1: "test" }] }],
+    [{ nested: [1, 2, null, 3, 4] }, { nested: [1, 2, 3, 4] }],
+    [
+      [{ hello: "world" }, null, { nested: { prop1: "test", prop2: null } }],
+      [{ hello: "world" }, { nested: { prop1: "test" } }],
+    ],
   ])("convertNullToUndefined", (obj, expected) => {
     convertNullToUndefined(obj);
     expect(obj).toStrictEqual(expected);
diff --git a/src/lib/object.ts b/src/lib/object.ts
index ac2f707..8bbee01 100644
--- a/src/lib/object.ts
+++ b/src/lib/object.ts
@@ -10,8 +10,16 @@ export const isObject = (obj: object): boolean =>
  * Convert null properties to undefined
  * @param obj The object
  */
-export const convertNullToUndefined = (obj: object): void => {
-  if (!isObject(obj)) {
+export const convertNullToUndefined = (obj: object | object[]): void => {
+  if (Array.isArray(obj)) {
+    for (const item of obj as unknown as object[]) {
+      if (item === null) {
+        obj.splice(obj.indexOf(item), 1);
+      } else if (isObject(item)) {
+        convertNullToUndefined(item);
+      }
+    }
+  } else if (!isObject(obj)) {
     return;
   }
 
@@ -19,7 +27,7 @@ export const convertNullToUndefined = (obj: object): void => {
     const value = obj[key as keyof typeof obj];
     if (value === null) {
       delete obj[key as keyof typeof obj];
-    } else if (isObject(value)) {
+    } else if (isObject(value) || Array.isArray(value)) {
       convertNullToUndefined(value);
     }
   }

From 5b5109e650005fee1fa417196cfa6f319ba3c794 Mon Sep 17 00:00:00 2001
From: Daniele Debernardi <daniele.debernardi@neolution.ch>
Date: Tue, 29 Jul 2025 12:01:47 +0200
Subject: [PATCH 2/2] fix

---
 src/lib/object.spec.ts | 4 ++--
 src/lib/object.ts      | 2 +-
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/src/lib/object.spec.ts b/src/lib/object.spec.ts
index 09c538d..4dfe5ff 100644
--- a/src/lib/object.spec.ts
+++ b/src/lib/object.spec.ts
@@ -37,10 +37,10 @@ describe("object tests", () => {
     [{ hello: "world", other: null }, { hello: "world" }],
     [{ nested: { prop1: "test", prop2: null } }, { nested: { prop1: "test" } }],
     [{ nested: [{ prop1: "test", prop2: null }] }, { nested: [{ prop1: "test" }] }],
-    [{ nested: [1, 2, null, 3, 4] }, { nested: [1, 2, 3, 4] }],
+    [{ nested: [1, 2, null, 3, 4] }, { nested: [1, 2, undefined, 3, 4] }],
     [
       [{ hello: "world" }, null, { nested: { prop1: "test", prop2: null } }],
-      [{ hello: "world" }, { nested: { prop1: "test" } }],
+      [{ hello: "world" }, undefined, { nested: { prop1: "test" } }],
     ],
   ])("convertNullToUndefined", (obj, expected) => {
     convertNullToUndefined(obj);
diff --git a/src/lib/object.ts b/src/lib/object.ts
index 8bbee01..cd4f1f8 100644
--- a/src/lib/object.ts
+++ b/src/lib/object.ts
@@ -14,7 +14,7 @@ export const convertNullToUndefined = (obj: object | object[]): void => {
   if (Array.isArray(obj)) {
     for (const item of obj as unknown as object[]) {
       if (item === null) {
-        obj.splice(obj.indexOf(item), 1);
+        obj[obj.indexOf(item)] = undefined;
       } else if (isObject(item)) {
         convertNullToUndefined(item);
       }