fix(proxy-state-tree): fix access of undefined and passing in plain object to constructor

Author: christianalfoni

packages/node_modules/proxy-state-tree/src/index.ts

@@ -1,4 +1,5 @@
 import proxify, { IS_PROXY, STATUS } from './proxify'
+const isPlainObject = require('is-plain-object')
 
 export type Options = {
   devmode: boolean
@@ -21,6 +22,10 @@ class ProxyStateTree {
   status: STATUS
   proxy: any
   constructor(state: object, options: Options = { devmode: true }) {
+    if (!isPlainObject(state)) {
+      throw new Error('You have to pass a plain object to the Proxy State Tree')
+    }
+
     this.state = state
     this.options = options
     this.pathDependencies = {}

packages/node_modules/proxy-state-tree/src/proxify.ts

@@ -70,6 +70,10 @@ function createArrayProxy(tree, value, path) {
         }
       }
 
+      if (target[prop] === undefined) {
+        return undefined
+      }
+
       return (target[prop] = proxify(tree, target[prop], nestedPath))
     },
     set(target, prop, value) {
@@ -111,6 +115,10 @@ function createObjectProxy(tree, value, path) {
         return targetValue(tree, nestedPath)
       }
 
+      if (targetValue === undefined) {
+        return undefined
+      }
+
       return (target[prop] = proxify(tree, targetValue, nestedPath))
     },
     set(target, prop, value) {