fix: isObject type inference

radashi-org · Jan 29, 2025 · 54dd104 · 54dd104
1 parent a280dd5
commit 54dd104
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Showing 2 changed files with 11 additions and 1 deletion.
diff --git a/src/typed/isObject.ts b/src/typed/isObject.ts
@@ -24,6 +24,6 @@ import { isTagged } from 'radashi'
  * ```
  * @version 12.1.0
  */
-export function isObject(value: unknown): value is object {
+export function isObject<T>(value: T): value is Exclude<T, Function> & object {
   return isTagged(value, '[object Object]')
 }
diff --git a/tests/typed/isObject.test.ts b/tests/typed/isObject.test.ts
@@ -38,4 +38,14 @@ describe('isObject', () => {
     const result = _.isObject([1, 2, 3])
     expect(result).toBeFalsy()
   })
+  test('correctly distinguishes between function and object in a union type', () => {
+    const returnSomething: () => (() => void) | { a: string } = () => ({ a: 'a' })
+    const something = returnSomething()
+
+    if (_.isObject(something)) {
+      expect(something).toEqual({ a: 'a' })
+    } else {
+      expect(typeof something).toBe('function')
+    }
+  })
 })