Got same issue with vue 2.7.13.

I am working around this issue by as any the watch options which makes typescript happy.

I think this is issue with vue instead of demi coz the type exported in vue 2.7 is (somehow magically?) compatible with both v3 and v2. Should we open issue on vue repo?

same issue!

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

Have same issue.
@lsdsjy thank you for solution

Temporary added patch:

diff --git a/node_modules/vue-demi/lib/index.d.ts b/node_modules/vue-demi/lib/index.d.ts
index 897b4c5..6cdfb78 100644
--- a/node_modules/vue-demi/lib/index.d.ts
+++ b/node_modules/vue-demi/lib/index.d.ts
@@ -18,6 +18,7 @@ declare const V: typeof Vue
 export declare type Plugin = PluginObject<any> | PluginFunction<any>
 export type { VNode } from 'vue'
 export * from 'vue'
+export type { WatchOptions } from 'vue/types/v3-generated'
 export { V as Vue, Vue2, isVue2, isVue3, version, install }

 // #region createApp polyfill

and added resolution in my package.json to freeze version:

"resolutions": {
        "vue-demi": "0.13.11"
    }

Hope this problem going to be solved asap

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.