return undefined if JS error is thrown (#267)

bindings/node.js/src/kzg.cxx

@@ -173,11 +173,11 @@ Napi::Value BlobToKzgCommitment(const Napi::CallbackInfo& info) {
   Napi::Env env = info.Env();
   Blob *blob = get_blob(env, info[0]);
   if (blob == nullptr) {
-    return env.Null();
+    return env.Undefined();
   }
   KZGSettings *kzg_settings = get_kzg_settings(env, info);
   if (kzg_settings == nullptr) {
-    return env.Null();
+    return env.Undefined();
   }
 
   KZGCommitment commitment;
@@ -185,7 +185,7 @@ Napi::Value BlobToKzgCommitment(const Napi::CallbackInfo& info) {
   if (ret != C_KZG_OK) {
      Napi::Error::New(env, "Failed to convert blob to commitment")
       .ThrowAsJavaScriptException();
-    return env.Null();
+    return env.Undefined();
   }
 
   return Napi::Buffer<uint8_t>::Copy(env, reinterpret_cast<uint8_t *>(&commitment), BYTES_PER_COMMITMENT);
@@ -206,15 +206,15 @@ Napi::Value ComputeKzgProof(const Napi::CallbackInfo& info) {
   Napi::Env env = info.Env();
   Blob *blob = get_blob(env, info[0]);
   if (blob == nullptr) {
-    return env.Null();
+    return env.Undefined();
   }
   Bytes32 *z_bytes = get_bytes32(env, info[1], "zBytes");
   if (z_bytes == nullptr) {
-    return env.Null();
+    return env.Undefined();
   }
   KZGSettings *kzg_settings = get_kzg_settings(env, info);
   if (kzg_settings == nullptr) {
-    return env.Null();
+    return env.Undefined();
   }
 
   KZGProof proof;
@@ -230,7 +230,7 @@ Napi::Value ComputeKzgProof(const Napi::CallbackInfo& info) {
   if (ret != C_KZG_OK) {
      Napi::Error::New(env, "Failed to compute proof")
       .ThrowAsJavaScriptException();
-    return env.Null();
+    return env.Undefined();
   }
 
   Napi::Array tuple = Napi::Array::New(env, 2);
@@ -255,15 +255,15 @@ Napi::Value ComputeBlobKzgProof(const Napi::CallbackInfo& info) {
   Napi::Env env = info.Env();
   Blob *blob = get_blob(env, info[0]);
   if (blob == nullptr) {
-    return env.Null();
+    return env.Undefined();
   }
   Bytes48 *commitment_bytes = get_bytes48(env, info[1], "commitmentBytes");
   if (commitment_bytes == nullptr) {
-    return env.Null();
+    return env.Undefined();
   }
   KZGSettings *kzg_settings = get_kzg_settings(env, info);
   if (kzg_settings == nullptr) {
-    return env.Null();
+    return env.Undefined();
   }
 
   KZGProof proof;
@@ -277,7 +277,7 @@ Napi::Value ComputeBlobKzgProof(const Napi::CallbackInfo& info) {
   if (ret != C_KZG_OK) {
      Napi::Error::New(env, "Error in computeBlobKzgProof")
       .ThrowAsJavaScriptException();
-    return env.Null();
+    return env.Undefined();
   }
 
   return Napi::Buffer<uint8_t>::Copy(env, reinterpret_cast<uint8_t *>(&proof), BYTES_PER_PROOF);
@@ -299,23 +299,23 @@ Napi::Value VerifyKzgProof(const Napi::CallbackInfo& info) {
   Napi::Env env = info.Env();
   Bytes48 *commitment_bytes = get_bytes48(env, info[0], "commitmentBytes");
   if (commitment_bytes == nullptr) {
-    return env.Null();
+    return env.Undefined();
   }
   Bytes32 *z_bytes = get_bytes32(env, info[1], "zBytes");
   if (z_bytes == nullptr) {
-    return env.Null();
+    return env.Undefined();
   }
   Bytes32 *y_bytes = get_bytes32(env, info[2], "yBytes");
   if (y_bytes == nullptr) {
-    return env.Null();
+    return env.Undefined();
   }
   Bytes48 *proof_bytes = get_bytes48(env, info[3], "proofBytes");
   if (proof_bytes == nullptr) {
-    return env.Null();
+    return env.Undefined();
   }
   KZGSettings *kzg_settings = get_kzg_settings(env, info);
   if (kzg_settings == nullptr) {
-    return env.Null();
+    return env.Undefined();
   }
 
   bool out;
@@ -330,7 +330,7 @@ Napi::Value VerifyKzgProof(const Napi::CallbackInfo& info) {
 
   if (ret != C_KZG_OK) {
     Napi::TypeError::New(env, "Failed to verify KZG proof").ThrowAsJavaScriptException();
-    return env.Null();
+    return env.Undefined();
   }
 
   return Napi::Boolean::New(env, out);
@@ -352,19 +352,19 @@ Napi::Value VerifyBlobKzgProof(const Napi::CallbackInfo& info) {
   Napi::Env env = info.Env();
   Blob *blob_bytes = get_blob(env, info[0]);
   if (blob_bytes == nullptr) {
-    return env.Null();
+    return env.Undefined();
   }
   Bytes48 *commitment_bytes = get_bytes48(env, info[1], "commitmentBytes");
   if (commitment_bytes == nullptr) {
-    return env.Null();
+    return env.Undefined();
   }
   Bytes48 *proof_bytes = get_bytes48(env, info[2], "proofBytes");
   if (proof_bytes == nullptr) {
-    return env.Null();
+    return env.Undefined();
   }
   KZGSettings *kzg_settings = get_kzg_settings(env, info);
   if (kzg_settings == nullptr) {
-    return env.Null();
+    return env.Undefined();
   }
 
   bool out;
@@ -377,7 +377,7 @@ Napi::Value VerifyBlobKzgProof(const Napi::CallbackInfo& info) {
 
   if (ret != C_KZG_OK) {
     Napi::TypeError::New(env, "Error in verifyBlobKzgProof").ThrowAsJavaScriptException();
-    return env.Null();
+    return env.Undefined();
   }
 
   return Napi::Boolean::New(env, out);
@@ -413,7 +413,7 @@ Napi::Value VerifyBlobKzgProofBatch(const Napi::CallbackInfo& info) {
   Napi::Array proofs_param = info[2].As<Napi::Array>();
   KZGSettings *kzg_settings = get_kzg_settings(env, info);
   if (kzg_settings == nullptr) {
-    return env.Null();
+    return env.Undefined();
   }
   uint32_t count = blobs_param.Length();
   if (count != commitments_param.Length() || count != proofs_param.Length()) {