Add minification for resolc_packed.js

Makefile

@@ -28,22 +28,9 @@ install-bin:
 install-npm:
 	npm install && npm fund
 
-RESOLC_WASM_TARGET_DIR=target/wasm32-unknown-emscripten/release
-RESOLC_WASM=$(RESOLC_WASM_TARGET_DIR)/resolc.wasm
-RESOLC_JS=$(RESOLC_WASM_TARGET_DIR)/resolc.js
-RESOLC_JS_PACKED=$(RESOLC_WASM_TARGET_DIR)/resolc_packed.js
-
 install-wasm: install-npm
 	cargo build --target wasm32-unknown-emscripten -p revive-solidity --release --no-default-features
-	@echo "let moduleArgs = { wasmBinary: (function(source, uncompressedSize) {" > $(RESOLC_JS_PACKED)
-	@cat js/utils/mini-lz4.js >> $(RESOLC_JS_PACKED)
-	@cat js/utils/base64DecToArr.js >> $(RESOLC_JS_PACKED)
-	@echo "return uncompress(base64DecToArr(source), uncompressedSize);})(" >> $(RESOLC_JS_PACKED)
-	@echo "\"$$(lz4c --no-frame-crc --best --favor-decSpeed "${RESOLC_WASM}" - | tail -c +8 | base64 -w 0 )\"," >> $(RESOLC_JS_PACKED)
-	@echo "$$(wc -c < $(RESOLC_WASM)))};" >> $(RESOLC_JS_PACKED)
-	@cat $(RESOLC_JS) >> $(RESOLC_JS_PACKED)
-	@echo "createRevive = createRevive.bind(null, moduleArgs);" >> $(RESOLC_JS_PACKED)
-	@echo "Combined script written to $(RESOLC_JS_PACKED)"
+	npm run build:package
 
 install-llvm-builder:
 	cargo install --path crates/llvm-builder

js/build.js

@@ -0,0 +1,63 @@
+const fs = require("fs");
+const path = require("path");
+const { execSync } = require("child_process");
+const { minify } = require("terser");
+
+const RESOLC_WASM_TARGET_DIR = path.join(
+  __dirname,
+  "../target/wasm32-unknown-emscripten/release",
+);
+const RESOLC_WASM = path.join(RESOLC_WASM_TARGET_DIR, "resolc.wasm");
+const RESOLC_JS = path.join(RESOLC_WASM_TARGET_DIR, "resolc.js");
+const RESOLC_JS_PACKED = path.join(RESOLC_WASM_TARGET_DIR, "resolc_packed.js");
+
+const execShellCommand = (cmd) => {
+  return execSync(cmd, {
+    encoding: "utf-8",
+    maxBuffer: 1024 * 1024 * 100,
+  }).trim();
+};
+
+const wasmBase64 = execShellCommand(
+  `lz4c --no-frame-crc --best --favor-decSpeed "${RESOLC_WASM}" - | tail -c +8 | base64 -w 0`,
+);
+
+const wasmSize = fs.statSync(RESOLC_WASM).size;
+
+const miniLz4 = fs.readFileSync(
+  path.join(__dirname, "utils/mini-lz4.js"),
+  "utf-8",
+);
+const base64DecToArr = fs.readFileSync(
+  path.join(__dirname, "utils/base64DecToArr.js"),
+  "utf-8",
+);
+const resolcJs = fs.readFileSync(RESOLC_JS, "utf-8");
+
+const packedJsContent = `
+let moduleArgs = { wasmBinary: (function(source, uncompressedSize) {
+  ${miniLz4}
+  ${base64DecToArr}
+  return uncompress(base64DecToArr(source), uncompressedSize);
+})("${wasmBase64}", ${wasmSize}),
+};
+
+${resolcJs}
+
+createRevive = createRevive.bind(null, moduleArgs);
+`;
+
+minify(packedJsContent)
+  .then((minifiedJs) => {
+    if (minifiedJs.error) {
+      console.error("Error during minification:", minifiedJs.error);
+      process.exit(1);
+    }
+
+    fs.writeFileSync(RESOLC_JS_PACKED, minifiedJs.code, "utf-8");
+    console.log(`Combined script written to ${RESOLC_JS_PACKED}`);
+  })
+  .catch((err) => {
+    console.error("Minification failed:", err);
+    process.exit(1);
+  });

js/package.json

@@ -11,13 +11,15 @@
     "test:node": "mocha --timeout 60000 ./tests",
     "test:bun": "bun test --timeout 60000 node.test",
     "test:all": "npm run test:node && npm run test:bun",
-    "format": "prettier --write ."
+    "format": "prettier --write .",
+    "build:package": "node ./build.js"
   },
   "devDependencies": {
     "@playwright/test": "^1.49.1",
     "chai": "^5.1.2",
     "http-server": "^14.1.1",
     "mocha": "^11.0.1",
-    "prettier": "^3.4.2"
+    "prettier": "^3.4.2",
+    "terser": "^5.37.0"
   }
 }

js/utils/mini-lz4.js

@@ -1,5 +1,7 @@
 function uncompress(source, uncompressedSize) {
 /*
+Source https://github.com/ethereum/solidity/blob/develop/scripts/ci/mini-lz4.js
+====
 based off https://github.com/emscripten-core/emscripten/blob/main/third_party/mini-lz4.js
 The license only applies to the body of this function (``uncompress``).
 ====

package.json

@@ -3,7 +3,8 @@
     "private": true,
     "scripts": {
         "test:cli": "npm run test -w crates/solidity/src/tests/cli-tests",
-        "test:wasm": "npm run test:all -w js"
+        "test:wasm": "npm run test:all -w js",
+        "build-package": "npm run build:package -w js"
     },
     "workspaces": [
         "crates/solidity/src/tests/cli-tests",