Fix bug with deriving default key from undefined props.

CHANGELOG.md

@@ -2,6 +2,9 @@
 
 All notable changes to this project will be documented in this file.
 
+## 3.1.5 - 2023-03-16
+- Fix bug with deriving default key from undefined props.
+
 ## 3.1.4 - 2023-01-16
 
 - Support searching by key in `logic.findMounted(123)` and `logic.isMounted('string key')`.

src/kea/kea.ts

@@ -109,7 +109,7 @@ export function kea<L extends Logic = Logic>(
   }
   wrapper.find = (keyOrProps?: Record<string, any> | KeyType) => {
     const builtLogic =
-      typeof keyOrProps === 'object'
+      typeof keyOrProps === 'object' || typeof keyOrProps === 'undefined'
         ? getCachedBuiltLogicByProps<L>(wrapper, keyOrProps)
         : getCachedBuiltLogicByKey<L>(wrapper, keyOrProps)
     if (builtLogic && getContext().mount.counter[builtLogic.pathString] > 0) {

test/jest/mount.js

@@ -1,4 +1,4 @@
-import { kea, resetContext, getContext } from '../../src'
+import { kea, resetContext, getContext, path, key } from '../../src'
 
 describe('mount', () => {
   beforeEach(() => {
@@ -193,4 +193,10 @@ describe('mount', () => {
       expect(logic.isMounted()).toEqual(true)
     })
   })
+
+  test('can mount logic with default key', () => {
+    const logic = kea([path((key) => ['scenes', 'misc', key]), key(({ id }) => id ?? 'default')])
+    logic.mount()
+    expect(logic.isMounted()).toEqual(true)
+  })
 })