fix(packages/core): mimic-dom should mimic sessionStorage

Fixes #2981

Author: starpit

packages/core/src/@types/mimic-dom.d.ts

@@ -9,6 +9,7 @@ interface SimpleLocalStorage {
 interface SimpleWindow {
   addEventListener?: () => void
   localStorage?: SimpleLocalStorage
+  sessionStorage?: SimpleLocalStorage
 }
 
 interface SimpleDocument {
@@ -23,6 +24,7 @@ declare module NodeJS  {
   interface Global {
     window: SimpleWindow
     localStorage: SimpleLocalStorage
+    sessionStorage: SimpleLocalStorage
     document: SimpleDocument
   }
 }

packages/core/src/util/mimic-dom.ts

@@ -173,20 +173,30 @@ export default function() {
   global.window = {}
   try {
     global.localStorage = Store()
+    global.sessionStorage = Store()
     debug('successfully initialized persistent localStorage')
   } catch (err) {
     debug('error initializing persistent localStorage', err)
 
     const _localStorage: Record<string, string> = {}
+    const _sessionStorage: Record<string, string> = {}
     global.localStorage = {
       setItem: (k: string, v: string) => {
         _localStorage[k] = v
         return v
       },
       getItem: (k: string) => _localStorage[k] || null
     }
+    global.sessionStorage = {
+      setItem: (k: string, v: string) => {
+        _sessionStorage[k] = v
+        return v
+      },
+      getItem: (k: string) => _sessionStorage[k] || null
+    }
   } finally {
     global.window.localStorage = localStorage
+    global.window.sessionStorage = sessionStorage
   }
 
   window.addEventListener = () => true