feat(std/node): add os.tmpdir() implementation (#4213)

2 files changed, 10 insertions, 10 deletions

diff --git a/std/node/os.ts b/std/node/os.ts
index f34551da9..4bc70d1ff 100644
--- a/std/node/os.ts
+++ b/std/node/os.ts
@@ -180,9 +180,9 @@ export function setPriority(pid: number, priority?: number): void {
   notImplemented(SEE_GITHUB_ISSUE);
 }
 
-/** Not yet implemented */
-export function tmpdir(): string {
-  notImplemented(SEE_GITHUB_ISSUE);
+/** Returns the operating system's default directory for temporary files as a string. */
+export function tmpdir(): string | null {
+  return Deno.dir("tmp");
 }
 
 /** Not yet implemented */
diff --git a/std/node/os_test.ts b/std/node/os_test.ts
index 6ef123575..a73a2d4e9 100644
--- a/std/node/os_test.ts
+++ b/std/node/os_test.ts
@@ -17,6 +17,13 @@ test({
 });
 
 test({
+  name: "tmp directory is a string",
+  fn() {
+    assertEquals(typeof os.tmpdir(), "string");
+  }
+});
+
+test({
   name: "hostname is a string",
   fn() {
     assertEquals(typeof os.hostname(), "string");
@@ -232,13 +239,6 @@ test({
     );
     assertThrows(
       () => {
-        os.tmpdir();
-      },
-      Error,
-      "Not implemented"
-    );
-    assertThrows(
-      () => {
         os.totalmem();
       },
       Error,