fixed issue with isOfType handling of null values

tool-belt · Jun 12, 2021 · 2a3d967 · 2a3d967
1 parent 2650b51
commit 2a3d967
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Showing 4 changed files with 9 additions and 2 deletions.
diff --git a/.idea/interfaceForge.iml b/.idea/interfaceForge.iml
diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -18,3 +18,7 @@
 [1.1.0]
 
 -   added required build args
+
+[1.1.1]
+
+-   fix issue with handling of null values in isOfType helper
diff --git a/src/utils.ts b/src/utils.ts
@@ -2,5 +2,5 @@ export function isOfType<T>(
     variable: unknown,
     property: keyof T,
 ): variable is T {
-    return (variable as T)[property] !== undefined;
+    return !!variable && (variable as T)[property] !== undefined;
 }
diff --git a/tests/index.spec.ts b/tests/index.spec.ts
@@ -15,7 +15,7 @@ interface ComplexObject {
 describe('InterfaceFactory', () => {
     const defaults: ComplexObject = {
         name: 'testObject',
-        value: 0,
+        value: null,
     };
     describe('.build', () => {
         it('builds correctly with defaults object literal', async () => {