From 7b60bec096d56ceebd81b3dbcbb2d9a2e3d6c85c Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Fabien=20Mauqui=C3=A9?= <fabien.mauquie@gmail.com>
Date: Fri, 29 Apr 2022 12:39:33 +0200
Subject: [PATCH] set initial memory history key to "default"

Documentation states that the initial entry always has key `"default"`. However on memory history this is not the case.

We check that the key is `"default"` to set a default behavior when the user clicks a "back" button to go back to home, but arrived at the page from a direct link. This works perfectly in the browser, but failed in the test because the key was not "default" on MemoryRouter.
---
 packages/history/index.ts | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/packages/history/index.ts b/packages/history/index.ts
index c8cdfc04..1e91e748 100644
--- a/packages/history/index.ts
+++ b/packages/history/index.ts
@@ -857,13 +857,13 @@ export function createMemoryHistory(
   options: MemoryHistoryOptions = {}
 ): MemoryHistory {
   let { initialEntries = ["/"], initialIndex } = options;
-  let entries: Location[] = initialEntries.map((entry) => {
+  let entries: Location[] = initialEntries.map((entry, index) => {
     let location = readOnly<Location>({
       pathname: "/",
       search: "",
       hash: "",
       state: null,
-      key: createKey(),
+      key: index === 0 ? "default" : createKey(),
       ...(typeof entry === "string" ? parsePath(entry) : entry),
     });