From e53874f7e72a50fa41e050198521b3a964b83659 Mon Sep 17 00:00:00 2001
From: Evan You <yyx990803@gmail.com>
Date: Mon, 19 Aug 2019 15:01:50 -0400
Subject: [PATCH] fix: reactive and immutable should warn for undefined

---
 packages/reactivity/src/reactive.ts | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/packages/reactivity/src/reactive.ts b/packages/reactivity/src/reactive.ts
index a965ceac..e09882bb 100644
--- a/packages/reactivity/src/reactive.ts
+++ b/packages/reactivity/src/reactive.ts
@@ -42,7 +42,7 @@ const canObserve = (value: any): boolean => {
 
 type ObservableFactory = <T>(target?: T) => UnwrapRef<T>
 
-export const reactive = ((target: any = {}): any => {
+export const reactive = ((target: unknown): any => {
   // if trying to observe an immutable proxy, return the immutable version.
   if (immutableToRaw.has(target)) {
     return target
@@ -60,7 +60,7 @@ export const reactive = ((target: any = {}): any => {
   )
 }) as ObservableFactory
 
-export const immutable = ((target: any = {}): any => {
+export const immutable = ((target: unknown): any => {
   // value is a mutable observable, retrive its original and return
   // a readonly version.
   if (observedToRaw.has(target)) {