fix: Traverse on null

packages/easy/src/utils/Traverse.ts

@@ -1,6 +1,7 @@
 import { AnyKey } from '../types/AnyKey';
 
-export const traverse = (subject: unknown = {}, property = ''): unknown => {
+export const traverse = (subject: unknown, property = ''): unknown => {
+  subject ??= {};
   const props = property.split('.');
   const p = props.shift() as string;
   return props.length === 0 ? (subject as any)[p] : traverse((subject as any)[p], props.join('.'));

packages/easy/test/utils/Traverse.test.ts

@@ -7,6 +7,22 @@ describe('traverse', () => {
     expect(traverse(undefined, '')).toBeUndefined();
   });
 
+  test('traverse with null subject', () => {
+    expect(traverse(null, '')).toBeUndefined();
+  });
+
+  test('traverse with false subject', () => {
+    expect(traverse(false, '')).toBeUndefined();
+  });
+
+  test('traverse with null subject nested', () => {
+    expect(traverse({ group: null }, 'group.name')).toBeUndefined();
+  });
+
+  test('traverse with undefined subject nested', () => {
+    expect(traverse({ group: undefined }, 'group.name')).toBeUndefined();
+  });
+
   test('traverse with undefined property', () => {
     expect(traverse(Dev.Jeroen, undefined as unknown as string)).toBeUndefined();
   });
@@ -35,6 +51,10 @@ describe('traverse', () => {
   test('traverse with existing double-nested property', () => {
     expect(traverse(Dev.Jeroen, 'created.by.id')).toBe(0);
   });
+
+  test('traverse with existing triple-nested property', () => {
+    expect(traverse({}, 'created.by.id')).toBeUndefined();
+  });
 });
 
 describe('traverseSet', () => {