3 files changed, 35 insertions, 30 deletions
diff --git a/src/bun.js/node/node_os.zig b/src/bun.js/node/node_os.zig
index 7f9ea2e28..f71143315 100644
--- a/src/bun.js/node/node_os.zig
+++ b/src/bun.js/node/node_os.zig
@@ -16,7 +16,7 @@ pub const Os = struct {
     pub const code = @embedFile("../os.exports.js");
 
     pub fn create(globalObject: *JSC.JSGlobalObject) callconv(.C) JSC.JSValue {
-        const module = JSC.JSValue.createEmptyObject(globalObject, 20);
+        const module = JSC.JSValue.createEmptyObject(globalObject, 22);
 
         module.put(globalObject, JSC.ZigString.static("arch"), JSC.NewFunction(globalObject, JSC.ZigString.static("arch"), 0, arch, true));
         module.put(globalObject, JSC.ZigString.static("cpus"), JSC.NewFunction(globalObject, JSC.ZigString.static("cpus"), 0, cpus, true));
@@ -31,7 +31,6 @@ pub const Os = struct {
         module.put(globalObject, JSC.ZigString.static("platform"), JSC.NewFunction(globalObject, JSC.ZigString.static("platform"), 0, platform, true));
         module.put(globalObject, JSC.ZigString.static("release"), JSC.NewFunction(globalObject, JSC.ZigString.static("release"), 0, release, true));
         module.put(globalObject, JSC.ZigString.static("setPriority"), JSC.NewFunction(globalObject, JSC.ZigString.static("setPriority"), 2, setPriority, true));
-        module.put(globalObject, JSC.ZigString.static("tmpdir"), JSC.NewFunction(globalObject, JSC.ZigString.static("tmpdir"), 0, tmpdir, true));
         module.put(globalObject, JSC.ZigString.static("totalmem"), JSC.NewFunction(globalObject, JSC.ZigString.static("totalmem"), 0, totalmem, true));
         module.put(globalObject, JSC.ZigString.static("type"), JSC.NewFunction(globalObject, JSC.ZigString.static("type"), 0, Os.type, true));
         module.put(globalObject, JSC.ZigString.static("uptime"), JSC.NewFunction(globalObject, JSC.ZigString.static("uptime"), 0, uptime, true));
@@ -485,7 +484,7 @@ pub const Os = struct {
                 std.os.AF.INET => JSC.ZigString.static("IPv4"),
                 std.os.AF.INET6 => JSC.ZigString.static("IPv6"),
                 else => JSC.ZigString.static("unknown"),
-            }).toValue(globalThis));
+            }).toValueGC(globalThis));
 
             // mac <string> The MAC address of the network interface
             {
@@ -620,29 +619,6 @@ pub const Os = struct {
         return JSC.JSValue.jsUndefined();
     }
 
-    pub fn tmpdir(globalThis: *JSC.JSGlobalObject, _: *JSC.CallFrame) callconv(.C) JSC.JSValue {
-        JSC.markBinding(@src());
-
-        const dir: []const u8 = brk: {
-            if (comptime Environment.isWindows) {
-                if (bun.getenvZ("TEMP") orelse bun.getenvZ("TMP")) |tmpdir_| {
-                    break :brk tmpdir_;
-                }
-
-                if (bun.getenvZ("SYSTEMROOT") orelse bun.getenvZ("WINDIR")) |systemdir_| {
-                    break :brk systemdir_ ++ "\\temp";
-                }
-            } else {
-                const dir = bun.asByteSlice(bun.getenvZ("TMPDIR") orelse bun.getenvZ("TMP") orelse bun.getenvZ("TEMP") orelse "/tmp");
-                break :brk strings.withoutTrailingSlash(dir);
-            }
-
-            break :brk "unknown";
-        };
-
-        return JSC.ZigString.init(dir).withEncoding().toValueGC(globalThis);
-    }
-
     pub fn totalmem(_: *JSC.JSGlobalObject, _: *JSC.CallFrame) callconv(.C) JSC.JSValue {
         JSC.markBinding(@src());
 
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,
diff --git a/src/js/out/modules/node/os.js b/src/js/out/modules/node/os.js
index e27464e15..69c112412 100644
--- a/src/js/out/modules/node/os.js
+++ b/src/js/out/modules/node/os.js
@@ -12,7 +12,9 @@ var bound = function(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),
@@ -24,6 +26,15 @@ var bound = function(obj) {
     constants: obj.constants,
     [Symbol.for("CommonJS")]: 0
   };
+}, tmpdir = function() {
+  var lazy = Symbol.for("Bun.lazy"), primordials = globalThis[lazy]("primordials"), { Bun: Bun2 } = primordials, env = Bun2.env;
+  return 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;
+  }, tmpdir();
 }, os = bound(Bun._Os()), {
   arch,
   cpus,
@@ -37,7 +48,6 @@ var bound = function(obj) {
   platform,
   release,
   setPriority,
-  tmpdir,
   totalmem,
   type,
   uptime,