workaround for errors with JSTag in jsc

Author: danleh

Kotlin-compose/build.log

@@ -1,4 +1,4 @@
-Built on 2025-08-06 12:54:47+02:00
+Built on 2025-08-08 16:11:09+02:00
 Cloning into 'compose-multiplatform'...
 84dad4d3f6 Use custom skiko (0.9.4.3) to fix the FinalizationRegistry API usage for web targets
 Copying generated files into build/

Kotlin-compose/build.sh

@@ -29,6 +29,8 @@ echo "Copying generated files into build/" | tee -a "$BUILD_LOG"
 mkdir -p build/ | tee -a "$BUILD_LOG"
 cp $BUILD_SRC_DIR/compose-benchmarks-benchmarks.{wasm,uninstantiated.mjs} build/ | tee -a "$BUILD_LOG"
 git apply hook-print.patch | tee -a "$BUILD_LOG"
+# TODO: Remove once either the Kotlin toolchain or JSC fixes the issue raised in https://github.com/WebKit/JetStream/pull/84#issuecomment-3164672425
+git apply jstag-workaround.patch | tee -a "$BUILD_LOG"
 cp $BUILD_SRC_DIR/skiko.{wasm,mjs} build/ | tee -a "$BUILD_LOG"
 git apply skiko-disable-instantiate.patch | tee -a "$BUILD_LOG"
 cp $BUILD_SRC_DIR/composeResources/compose_benchmarks.benchmarks.generated.resources/drawable/example1_cat.jpg build/ | tee -a "$BUILD_LOG"

Kotlin-compose/build/compose-benchmarks-benchmarks.uninstantiated.mjs

@@ -383,7 +383,7 @@ export async function instantiate(imports={}, runInitializer=true) {
 
     const wasmFilePath = './compose-benchmarks-benchmarks.wasm';
 
-    const wasmTag = WebAssembly.JSTag ?? new WebAssembly.Tag({ parameters: ['externref'] });
+    const wasmTag = new WebAssembly.Tag({ parameters: ['externref'] });
 
     const importObject = {
         js_code,

Kotlin-compose/jstag-workaround.patch

@@ -0,0 +1,13 @@
+diff --git a/Kotlin-compose/build/compose-benchmarks-benchmarks.uninstantiated.mjs b/Kotlin-compose/build/compose-benchmarks-benchmarks.uninstantiated.mjs
+index 3427ca2..882308d 100644
+--- a/Kotlin-compose/build/compose-benchmarks-benchmarks.uninstantiated.mjs
++++ b/Kotlin-compose/build/compose-benchmarks-benchmarks.uninstantiated.mjs
+@@ -383,7 +383,7 @@ export async function instantiate(imports={}, runInitializer=true) {
+ 
+     const wasmFilePath = './compose-benchmarks-benchmarks.wasm';
+ 
+-    const wasmTag = WebAssembly.JSTag ?? new WebAssembly.Tag({ parameters: ['externref'] });
++    const wasmTag = new WebAssembly.Tag({ parameters: ['externref'] });
+ 
+     const importObject = {
+         js_code,