feat(wasm-utxo): improve ESM compatibility

Configure ESLint to prevent Node.js globals in production code and replace
Buffer with Uint8Array in tests. Split tsconfig files to separate test
and production code configuration.

Issue: BTC-2866

Co-authored-by: llm-git <llm-git@ttll.de>

Author: OttoAllmendinger

packages/wasm-utxo/eslint.config.js

@@ -7,7 +7,7 @@ export default tseslint.config(
   {
     languageOptions: {
       parserOptions: {
-        projectService: true,
+        project: ["./tsconfig.json", "./tsconfig.test.json"],
         tsconfigRootDir: import.meta.dirname,
       },
     },
@@ -25,4 +25,29 @@ export default tseslint.config(
       "*.config.js",
     ],
   },
+  // Ban Node.js globals in production code
+  {
+    files: ["js/**/*.ts"],
+    rules: {
+      "no-restricted-globals": [
+        "error",
+        {
+          name: "Buffer",
+          message: "Use Uint8Array instead of Buffer for ESM compatibility.",
+        },
+        {
+          name: "process",
+          message: "Avoid Node.js process global for ESM compatibility.",
+        },
+        {
+          name: "__dirname",
+          message: "Use import.meta.url instead of __dirname for ESM.",
+        },
+        {
+          name: "__filename",
+          message: "Use import.meta.url instead of __filename for ESM.",
+        },
+      ],
+    },
+  },
 );

packages/wasm-utxo/test/descriptorWallet/address.ts

@@ -19,7 +19,7 @@ describe("descriptorWallet/address", () => {
       const descriptor = Descriptor.fromStringDetectType(definiteDescriptor);
       const script = createScriptPubKeyFromDescriptor(descriptor, undefined);
 
-      assert.ok(Buffer.isBuffer(script));
+      assert.ok(script instanceof Uint8Array);
       // P2WPKH scripts are 22 bytes (OP_0 + 20 byte hash)
       assert.strictEqual(script.length, 22);
       assert.strictEqual(script[0], 0x00); // OP_0
@@ -30,7 +30,7 @@ describe("descriptorWallet/address", () => {
       const descriptor = Descriptor.fromStringDetectType(derivableDescriptor);
       const script = createScriptPubKeyFromDescriptor(descriptor, 0);
 
-      assert.ok(Buffer.isBuffer(script));
+      assert.ok(script instanceof Uint8Array);
       assert.strictEqual(script.length, 22);
     });
 

packages/wasm-utxo/tsconfig.cjs.json

@@ -5,6 +5,5 @@
     "moduleResolution": "node",
     "rootDir": ".",
     "outDir": "./dist/cjs"
-  },
-  "exclude": ["test/**/*"]
+  }
 }

packages/wasm-utxo/tsconfig.json

@@ -11,8 +11,9 @@
     "rootDir": ".",
     "outDir": "./dist/esm",
     "noUnusedLocals": true,
-    "noUnusedParameters": true
+    "noUnusedParameters": true,
+    "types": []
   },
-  "include": ["./js/**/*.ts", "test/**/*.ts"],
+  "include": ["./js/**/*.ts"],
   "exclude": ["node_modules", "./js/wasm/**/*"]
 }

packages/wasm-utxo/tsconfig.test.json

@@ -0,0 +1,8 @@
+{
+  "extends": "./tsconfig.json",
+  "compilerOptions": {
+    "types": ["node", "mocha"],
+    "noEmit": true
+  },
+  "include": ["./js/**/*.ts", "test/**/*.ts"]
+}