Make `node:os` `tmpdir` more consistent with Node.js

1 files changed, 21 insertions, 2 deletions

diff --git a/src/js/node/os.js b/src/js/node/os.js
index 3315708ad..3cd0288bd 100644
--- a/src/js/node/os.js
+++ b/src/js/node/os.js
@@ -1,4 +1,22 @@
 // Hardcoded module "node:os"
+
+export var tmpdir = function () {
+  var lazy = Symbol.for("Bun.lazy");
+  var primordials = globalThis[lazy]("primordials");
+
+  var { Bun } = primordials;
+  var env = Bun.env;
+
+  tmpdir = function () {
+    var path = env["TMPDIR"] || env["TMP"] || env["TEMP"] || "/tmp";
+    const length = path.length;
+    if (length > 1 && path[length - 1] === "/") path = path.slice(0, -1);
+    return path;
+  };
+
+  return tmpdir();
+};
+
 function bound(obj) {
   return {
     arch: obj.arch.bind(obj),
@@ -13,7 +31,9 @@ function bound(obj) {
     platform: obj.platform.bind(obj),
     release: obj.release.bind(obj),
     setPriority: obj.setPriority.bind(obj),
-    tmpdir: obj.tmpdir.bind(obj),
+    get tmpdir() {
+      return tmpdir;
+    },
     totalmem: obj.totalmem.bind(obj),
     type: obj.type.bind(obj),
     uptime: obj.uptime.bind(obj),
@@ -42,7 +62,6 @@ export var {
   platform,
   release,
   setPriority,
-  tmpdir,
   totalmem,
   type,
   uptime,