build: Publish NPM package with type commonjs (#2047)

Author: Danielku15

package.json

@@ -60,7 +60,8 @@
         "test-csharp": "cd src.csharp && dotnet test -c Release",
         "test-kotlin": "node scripts/gradlew.mjs testReleaseUnitTest --info",
         "test-accept-reference": "tsx scripts/accept-new-reference-files.ts",
-        "typecheck": "tsc --noEmit"
+        "typecheck": "tsc --noEmit",
+        "prepack": "node scripts/prepack.mjs"
     },
     "devDependencies": {
         "@biomejs/biome": "^1.9.4",

scripts/prepack.mjs

@@ -0,0 +1,11 @@
+import path from 'node:path';
+import url from 'node:url';
+import fs from 'node:fs';
+
+const __dirname = url.fileURLToPath(new URL('.', import.meta.url));
+const packageJsonPath = path.resolve(__dirname, '..', 'package.json');
+
+
+let packageJsonContent = await fs.promises.readFile(packageJsonPath, 'utf-8');
+packageJsonContent = packageJsonContent.replace('"type": "module"', '"type": "commonjs"');
+await fs.promises.writeFile(packageJsonPath, packageJsonContent);