diff --git a/ets2panda/test/ast/parser/ts/deleting_local_var.ts b/ets2panda/test/ast/parser/ts/deleting_local_var.ts
new file mode 100644
index 0000000000000000000000000000000000000000..b132d6f719a99af049d11e614ad81dcb79b14219
--- /dev/null
+++ b/ets2panda/test/ast/parser/ts/deleting_local_var.ts
@@ -0,0 +1,19 @@
+/*
+ * Copyright (c) 2025 Huawei Device Co., Ltd.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+let x = 42;
+delete x;
+
+/* @@? 17:9 Error SyntaxError: Deleting local variable in strict mode. */
diff --git a/ets2panda/test/ast/parser/ts/regex_class_range_out_of_order.ts b/ets2panda/test/ast/parser/ts/regex_class_range_out_of_order.ts
new file mode 100644
index 0000000000000000000000000000000000000000..66ced1f7e3ec8325be3612bfc3b35c9cf8d8a3b4
--- /dev/null
+++ b/ets2panda/test/ast/parser/ts/regex_class_range_out_of_order.ts
@@ -0,0 +1,18 @@
+/*
+ * Copyright (c) 2025 Huawei Device Co., Ltd.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+const regex = /[z-a]/
+
+/* @@? 16:16 Error SyntaxError: Class range out of order. */
diff --git a/ets2panda/test/ast/parser/ts/regex_invalid_assertion.ts b/ets2panda/test/ast/parser/ts/regex_invalid_assertion.ts
new file mode 100644
index 0000000000000000000000000000000000000000..5ecc52e41b6f07845832f465e890e110ca9ef8da
--- /dev/null
+++ b/ets2panda/test/ast/parser/ts/regex_invalid_assertion.ts
@@ -0,0 +1,18 @@
+/*
+ * Copyright (c) 2025 Huawei Device Co., Ltd.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+const regex = /(?!/ 
+
+/* @@? 16:16 Error SyntaxError: Invalid assertion. */
diff --git a/ets2panda/test/ast/parser/ts/regex_invalid_char.ts b/ets2panda/test/ast/parser/ts/regex_invalid_char.ts
new file mode 100644
index 0000000000000000000000000000000000000000..67a3d115be1da1c8be590b2ae697129a89e6e046
--- /dev/null
+++ b/ets2panda/test/ast/parser/ts/regex_invalid_char.ts
@@ -0,0 +1,18 @@
+/*
+ * Copyright (c) 2025 Huawei Device Co., Ltd.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+const regex = /?abc/; 
+
+/* @@? 16:16 Error SyntaxError: Invalid character. */
diff --git a/ets2panda/test/ast/parser/ts/regex_invalid_closing_parenthesis.ts b/ets2panda/test/ast/parser/ts/regex_invalid_closing_parenthesis.ts
new file mode 100644
index 0000000000000000000000000000000000000000..41a168aef7a7f84a191e68e83ad6d12bcaa0b8f2
--- /dev/null
+++ b/ets2panda/test/ast/parser/ts/regex_invalid_closing_parenthesis.ts
@@ -0,0 +1,18 @@
+/*
+ * Copyright (c) 2025 Huawei Device Co., Ltd.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+const regex = /abc)/; 
+
+/* @@? 16:16 Error SyntaxError: Invalid closing parenthesis. */
diff --git a/ets2panda/test/ast/parser/ts/regex_invalid_non_capturing_group.ts b/ets2panda/test/ast/parser/ts/regex_invalid_non_capturing_group.ts
new file mode 100644
index 0000000000000000000000000000000000000000..ee8fbc1596d485fd31b3f582a382c9b2b4075303
--- /dev/null
+++ b/ets2panda/test/ast/parser/ts/regex_invalid_non_capturing_group.ts
@@ -0,0 +1,18 @@
+/*
+ * Copyright (c) 2025 Huawei Device Co., Ltd.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+const regex = /(?:abc/;
+
+/* @@? 16:16 Error SyntaxError: Invalid non-capturing group. */
diff --git a/ets2panda/test/ast/parser/ts/regex_quantifier_ranege.ts b/ets2panda/test/ast/parser/ts/regex_quantifier_ranege.ts
new file mode 100644
index 0000000000000000000000000000000000000000..905c66a3e789ac27d7678e6c01239006826483aa
--- /dev/null
+++ b/ets2panda/test/ast/parser/ts/regex_quantifier_ranege.ts
@@ -0,0 +1,18 @@
+/*
+ * Copyright (c) 2025 Huawei Device Co., Ltd.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+const regex = /a{3,2}/; 
+
+/* @@? 16:16 Error SyntaxError: Quantifier range out of order. */
diff --git a/ets2panda/test/ast/parser/ts/unterminated_multi_line_comment.ts b/ets2panda/test/ast/parser/ts/unterminated_multi_line_comment.ts
new file mode 100644
index 0000000000000000000000000000000000000000..d56d6fd4f93157529e3dafeb12a72fecdd93df9f
--- /dev/null
+++ b/ets2panda/test/ast/parser/ts/unterminated_multi_line_comment.ts
@@ -0,0 +1,18 @@
+/*
+ * Copyright (c) 2025 Huawei Device Co., Ltd.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/* @@? 1:1 Error SyntaxError: Unterminated multi-line comment. */
+
+/*
diff --git a/ets2panda/util/diagnostic/syntax.yaml b/ets2panda/util/diagnostic/syntax.yaml
index 6ceffd61d75754163aecf4eeb1110c15ddf32d46..74ca8223a83de14e2d4d9ee8184e8048f09c0267 100644
--- a/ets2panda/util/diagnostic/syntax.yaml
+++ b/ets2panda/util/diagnostic/syntax.yaml
@@ -626,10 +626,6 @@ syntax:
   id: 266
   message: "Invalid digit."
 
-- name: INVALID_ENUM_TYPE
-  id: 35
-  message: "Invalid enum initialization type."
-
 - name: INVALID_ESCAPE
   id: 87
   message: "Invalid escape."
@@ -1323,6 +1319,7 @@ syntax:
 
 graveyard:
 - 29
+- 35
 - 37
 - 41
 - 74