From cdf8a35c3a6fa948d3df44f1ab4821883c69e647 Mon Sep 17 00:00:00 2001
From: Kleis Auke Wolthuizen <github@kleisauke.nl>
Date: Thu, 2 Jul 2026 20:38:07 +0200
Subject: [PATCH 1/2] Add Closure externs for `growable` and `resizable`
 properties

Prevents Closure compiler from mangling the `resizable` and
`growable` properties accessed on `HEAP8.buffer`.
---
 src/closure-externs/closure-externs.js | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/closure-externs/closure-externs.js b/src/closure-externs/closure-externs.js
index 8199fe8460569..d5f45227a9cb5 100644
--- a/src/closure-externs/closure-externs.js
+++ b/src/closure-externs/closure-externs.js
@@ -210,3 +210,9 @@ var os = {};
 AudioWorkletProcessor.parameterDescriptors;
 
 var scheduler = {};
+
+/** @type {boolean} */
+ArrayBuffer.prototype.resizable;
+
+/** @type {boolean} */
+SharedArrayBuffer.prototype.growable;

From 2f152401bd9073ce5e3ccfebc4d0666658addad8 Mon Sep 17 00:00:00 2001
From: Kleis Auke Wolthuizen <github@kleisauke.nl>
Date: Fri, 3 Jul 2026 07:54:33 +0000
Subject: [PATCH 2/2] Automatic rebaseline of codesize expectations. NFC

This is an automatic change generated by tools/maint/rebaseline_tests.py.

The following (3) test expectation files were updated by
running the tests with `--rebaseline`:

```
codesize/test_codesize_mem_O3_grow.json: 9647 => 9655 [+8 bytes / +0.08%]
codesize/test_codesize_mem_O3_grow_standalone.json: 9493 => 9501 [+8 bytes / +0.08%]
codesize/test_codesize_minimal_pthreads_memgrowth.json: 26607 => 26614 [+7 bytes / +0.03%]

Average change: +0.06% (+0.03% - +0.08%)
```
---
 test/codesize/test_codesize_mem_O3_grow.json              | 8 ++++----
 test/codesize/test_codesize_mem_O3_grow_standalone.json   | 4 ++--
 .../test_codesize_minimal_pthreads_memgrowth.json         | 8 ++++----
 3 files changed, 10 insertions(+), 10 deletions(-)

diff --git a/test/codesize/test_codesize_mem_O3_grow.json b/test/codesize/test_codesize_mem_O3_grow.json
index 47a146c9c54f5..f6607092d8ce1 100644
--- a/test/codesize/test_codesize_mem_O3_grow.json
+++ b/test/codesize/test_codesize_mem_O3_grow.json
@@ -1,10 +1,10 @@
 {
-  "a.out.js": 4386,
-  "a.out.js.gz": 2154,
+  "a.out.js": 4394,
+  "a.out.js.gz": 2155,
   "a.out.nodebug.wasm": 5261,
   "a.out.nodebug.wasm.gz": 2419,
-  "total": 9647,
-  "total_gz": 4573,
+  "total": 9655,
+  "total_gz": 4574,
   "sent": [
     "a (emscripten_resize_heap)"
   ],
diff --git a/test/codesize/test_codesize_mem_O3_grow_standalone.json b/test/codesize/test_codesize_mem_O3_grow_standalone.json
index c3689358c5a28..3d8fe2492cb6f 100644
--- a/test/codesize/test_codesize_mem_O3_grow_standalone.json
+++ b/test/codesize/test_codesize_mem_O3_grow_standalone.json
@@ -1,9 +1,9 @@
 {
-  "a.out.js": 3852,
+  "a.out.js": 3860,
   "a.out.js.gz": 1896,
   "a.out.nodebug.wasm": 5641,
   "a.out.nodebug.wasm.gz": 2659,
-  "total": 9493,
+  "total": 9501,
   "total_gz": 4555,
   "sent": [
     "args_get",
diff --git a/test/codesize/test_codesize_minimal_pthreads_memgrowth.json b/test/codesize/test_codesize_minimal_pthreads_memgrowth.json
index 371d9194c76c6..ef610802c66d8 100644
--- a/test/codesize/test_codesize_minimal_pthreads_memgrowth.json
+++ b/test/codesize/test_codesize_minimal_pthreads_memgrowth.json
@@ -1,10 +1,10 @@
 {
-  "a.out.js": 7543,
-  "a.out.js.gz": 3705,
+  "a.out.js": 7550,
+  "a.out.js.gz": 3708,
   "a.out.nodebug.wasm": 19064,
   "a.out.nodebug.wasm.gz": 8804,
-  "total": 26607,
-  "total_gz": 12509,
+  "total": 26614,
+  "total_gz": 12512,
   "sent": [
     "a (memory)",
     "b (exit)",