fix: enable Mac builds using Homebrew LLVM

packages/wasm-utxo/Makefile

@@ -6,6 +6,24 @@ ifdef WASM_PACK_DEV
 	WASM_PACK_FLAGS += --dev
 endif
 
+# Auto-detect Mac and use Homebrew LLVM for WASM compilation
+# Apple's Clang doesn't support wasm32-unknown-unknown target
+UNAME_S := $(shell uname -s)
+
+ifeq ($(UNAME_S),Darwin)
+  # Mac detected - check for Homebrew LLVM installation
+  HOMEBREW_LLVM := $(shell brew --prefix llvm 2>/dev/null)
+
+  ifdef HOMEBREW_LLVM
+    export CC = $(HOMEBREW_LLVM)/bin/clang
+    export AR = $(HOMEBREW_LLVM)/bin/llvm-ar
+    $(info Using Homebrew LLVM: $(HOMEBREW_LLVM))
+  else
+    $(warning Homebrew LLVM not found. Install with: brew install llvm)
+    $(warning Continuing with system clang - may fail on Apple Silicon)
+  endif
+endif
+
 define WASM_PACK_COMMAND
 	$(WASM_PACK) build --no-opt --out-dir $(1) $(WASM_PACK_FLAGS) --target $(2)
 endef
@@ -34,16 +52,16 @@ define BUILD
 	$(call SHOW_WASM_SIZE,$(1))
 endef
 
-.PHONY: js/wasm/
-js/wasm/:
+.PHONY: js/wasm
+js/wasm:
 	$(call BUILD,$@,bundler)
 
-.PHONY: dist/esm/js/wasm/
-dist/esm/js/wasm/:
+.PHONY: dist/esm/js/wasm
+dist/esm/js/wasm:
 	$(call BUILD,$@,bundler)
 
-.PHONY: dist/cjs/js/wasm/
-dist/cjs/js/wasm/:
+.PHONY: dist/cjs/js/wasm
+dist/cjs/js/wasm:
 	$(call BUILD,$@,nodejs)
 
 .PHONY: lint

packages/wasm-utxo/README.md

@@ -24,10 +24,20 @@ This project is under active development.
 
 ## Building
 
-If your system has problems with `wasm-pack` (Mac M1), you can use the `Container.mk` Makefile to build the wasm files:
+### Mac
+
+Requires Homebrew LLVM (Apple's Clang doesn't support WASM targets):
+
+```bash
+brew install llvm
+npm run build
+```
+
+### Docker (optional)
+
+If you prefer a containerized build environment:
 
 ```bash
-cd packages/wasm-utxo
 make -f Container.mk build-image
 make -f Container.mk build-wasm
 ```

packages/wasm-utxo/package.json

@@ -36,12 +36,12 @@
     "test": "npm run test:mocha && npm run test:wasm-pack && npm run test:imports",
     "test:mocha": "mocha --recursive test",
     "test:wasm-pack": "npm run test:wasm-pack-node && npm run test:wasm-pack-chrome",
-    "test:wasm-pack-node": "wasm-pack test --node",
-    "test:wasm-pack-chrome": "wasm-pack test --headless --chrome",
+    "test:wasm-pack-node": "./scripts/wasm-pack-test.sh --node",
+    "test:wasm-pack-chrome": "./scripts/wasm-pack-test.sh --headless --chrome",
     "test:esm-import": "node --experimental-wasm-modules bundler-test/test-esm-import.mjs",
     "test:cjs-import": "node bundler-test/test-cjs-import.cjs",
     "test:imports": "npm run test:esm-import && npm run test:cjs-import",
-    "build:wasm": "make js/wasm/ && make dist/esm/js/wasm/ && make dist/cjs/js/wasm/",
+    "build:wasm": "make js/wasm && make dist/esm/js/wasm && make dist/cjs/js/wasm",
     "build:ts-esm": "tsc",
     "build:ts-cjs": "tsc --project tsconfig.cjs.json",
     "build:ts": "npm run build:ts-esm && npm run build:ts-cjs",

packages/wasm-utxo/scripts/wasm-pack-test.sh

@@ -0,0 +1,15 @@
+#!/bin/bash
+# Wrapper script for wasm-pack test that sets correct compiler on Mac
+
+# Detect Mac and set LLVM compiler
+if [[ "$(uname -s)" == "Darwin" ]]; then
+    LLVM_PATH=$(brew --prefix llvm 2>/dev/null)
+    if [ -n "$LLVM_PATH" ]; then
+        export CC="$LLVM_PATH/bin/clang"
+        export AR="$LLVM_PATH/bin/llvm-ar"
+    fi
+fi
+
+# Run wasm-pack test with all passed arguments
+wasm-pack test "$@"
+