fix(ext/node): homedir() `getpwuid`/`SHGetKnownFolderPath` fallback (#23841)

**Unix**: Returns the value of the HOME environment variable if it is
set even if it is an empty string. Otherwise, it tries to determine the
home directory by invoking the
[getpwuid_r](https://linux.die.net/man/3/getpwuid_r) function with the
UID of the current user.

**Windows**: Returns the value of the USERPROFILE environment variable
if it is set and it is not an empty string. Otherwise, it tries to
determine the home directory by invoking the
[SHGetKnownFolderPath](https://learn.microsoft.com/en-us/windows/win32/api/shlobj_core/nf-shlobj_core-shgetknownfolderpath)
function with
[FOLDERID_Profile](https://learn.microsoft.com/en-us/windows/win32/shell/knownfolderid).

Fixes https://github.com/denoland/deno/issues/23824

1 files changed, 8 insertions, 0 deletions

diff --git a/tests/unit_node/os_test.ts b/tests/unit_node/os_test.ts
index 9ce9fc9eb..810c22518 100644
--- a/tests/unit_node/os_test.ts
+++ b/tests/unit_node/os_test.ts
@@ -48,6 +48,14 @@ Deno.test({
 });
 
 Deno.test({
+  name: "home directory when HOME is not set",
+  fn() {
+    Deno.env.delete("HOME");
+    assertEquals(typeof os.homedir(), "string");
+  },
+});
+
+Deno.test({
   name: "tmp directory is a string",
   fn() {
     assertEquals(typeof os.tmpdir(), "string");