Typescript error when using slot props with v-else #5850
Description
Vue - Official extension or vue-tsc version
3.1.8
VSCode version
1.105.1
Vue version
3.5.25
TypeScript version
5.9.3
System Info
System:
OS: Linux 6.17 Ubuntu 25.10 25.10 (Questing Quokka)
CPU: (14) x64 Intel(R) Core(TM) i7-14700HX
Memory: 10.17 GB / 20.97 GB
Container: Yes
Shell: 5.2.37 - /bin/bash
Binaries:
Node: 24.10.0 - /home/s/.nvm/versions/node/v24.10.0/bin/node
npm: 11.6.4 - /home/s/.nvm/versions/node/v24.10.0/bin/npm
Browsers:
Chrome: 143.0.7499.40package.json dependencies
Steps to reproduce
Take a look at reproducer.zip for a minimal example. The following produces a type error in the v-else line:
<Comp>
<template v-if="flag" #default="{message, count}">{{ message }} {{ count }} </template>
<template v-else #default="{message, count}">{{ message }} {{ count + 1 }} </template>
</Comp>
What is expected?
This has been working with language-tools 3.1.5
What is actually happening?
src/App.vue:10:55 - error TS2339: Property 'message' does not exist on type '{ flag: true; $: ComponentInternalInstance; $data: {}; $props: {}; $attrs: Data; $refs: Data; $slots: Readonly<InternalSlots>; ... 8 more ...; $watch<T extends string | ((...args: any) => any)>(source: T, cb: T extends (...args: any) => infer R ? (args_0: R, args_1: R, args_2: OnCleanup) => any : (args_0: any, args_...'.
10 <template v-else #default="{ message, count }">{{ message }} {{ count }} </template>
~~~~~~~
Link to minimal reproduction
No response