diff --git a/ets2panda/parser/ETSparser.cpp b/ets2panda/parser/ETSparser.cpp
index a78f3e1ad6e113215d15f1cfc2ece7331dcafdc5..22c37aac453a2d9712e53b5afa9e9fa77efcdd67 100644
--- a/ets2panda/parser/ETSparser.cpp
+++ b/ets2panda/parser/ETSparser.cpp
@@ -4657,16 +4657,24 @@ void ETSParser::CheckDeclare()
     Lexer()->NextToken();  // eat 'declare'
 
     switch (Lexer()->GetToken().KeywordType()) {
-        case lexer::TokenType::KEYW_LET:
+        case lexer::TokenType::KEYW_ABSTRACT:
+        case lexer::TokenType::KEYW_CLASS:
         case lexer::TokenType::KEYW_CONST:
+        case lexer::TokenType::KEYW_ENUM:
         case lexer::TokenType::KEYW_FUNCTION:
-        case lexer::TokenType::KEYW_CLASS:
+        case lexer::TokenType::KEYW_INTERFACE:
+        case lexer::TokenType::KEYW_LET:
         case lexer::TokenType::KEYW_NAMESPACE:
-        case lexer::TokenType::KEYW_ENUM:
-        case lexer::TokenType::KEYW_ABSTRACT:
-        case lexer::TokenType::KEYW_INTERFACE: {
+        case lexer::TokenType::KEYW_TYPE: {
             return;
         }
+        case lexer::TokenType::LITERAL_IDENT: {
+            if (Lexer()->GetToken().Ident().Is("namespace")) {
+                ThrowSyntaxError("Ambient namespace declarations are not yet implemented");
+            }
+
+            [[fallthrough]];
+        }
         default: {
             ThrowSyntaxError("Unexpected token.");
         }
diff --git a/ets2panda/test/compiler/ets/declare_type_alias-expected.txt b/ets2panda/test/compiler/ets/declare_type_alias-expected.txt
new file mode 100644
index 0000000000000000000000000000000000000000..53484c2cca3c000420c0ea8ff9ba142fcf028f74
--- /dev/null
+++ b/ets2panda/test/compiler/ets/declare_type_alias-expected.txt
@@ -0,0 +1,250 @@
+{
+  "type": "Program",
+  "statements": [
+    {
+      "type": "TSTypeAliasDeclaration",
+      "id": {
+        "type": "Identifier",
+        "name": "KPointer",
+        "decorators": [],
+        "loc": {
+          "start": {
+            "line": 16,
+            "column": 14
+          },
+          "end": {
+            "line": 16,
+            "column": 22
+          }
+        }
+      },
+      "typeAnnotation": {
+        "type": "ETSUnionType",
+        "types": [
+          {
+            "type": "ETSTypeReference",
+            "part": {
+              "type": "ETSTypeReferencePart",
+              "name": {
+                "type": "Identifier",
+                "name": "number",
+                "decorators": [],
+                "loc": {
+                  "start": {
+                    "line": 16,
+                    "column": 25
+                  },
+                  "end": {
+                    "line": 16,
+                    "column": 31
+                  }
+                }
+              },
+              "loc": {
+                "start": {
+                  "line": 16,
+                  "column": 25
+                },
+                "end": {
+                  "line": 16,
+                  "column": 33
+                }
+              }
+            },
+            "loc": {
+              "start": {
+                "line": 16,
+                "column": 25
+              },
+              "end": {
+                "line": 16,
+                "column": 33
+              }
+            }
+          },
+          {
+            "type": "ETSPrimitiveType",
+            "loc": {
+              "start": {
+                "line": 16,
+                "column": 34
+              },
+              "end": {
+                "line": 16,
+                "column": 37
+              }
+            }
+          }
+        ],
+        "loc": {
+          "start": {
+            "line": 16,
+            "column": 25
+          },
+          "end": {
+            "line": 16,
+            "column": 37
+          }
+        }
+      },
+      "loc": {
+        "start": {
+          "line": 16,
+          "column": 9
+        },
+        "end": {
+          "line": 16,
+          "column": 38
+        }
+      }
+    },
+    {
+      "type": "ClassDeclaration",
+      "definition": {
+        "id": {
+          "type": "Identifier",
+          "name": "ETSGLOBAL",
+          "decorators": [],
+          "loc": {
+            "start": {
+              "line": 1,
+              "column": 1
+            },
+            "end": {
+              "line": 1,
+              "column": 1
+            }
+          }
+        },
+        "superClass": null,
+        "implements": [],
+        "body": [
+          {
+            "type": "MethodDefinition",
+            "key": {
+              "type": "Identifier",
+              "name": "_$init$_",
+              "decorators": [],
+              "loc": {
+                "start": {
+                  "line": 1,
+                  "column": 1
+                },
+                "end": {
+                  "line": 1,
+                  "column": 1
+                }
+              }
+            },
+            "kind": "method",
+            "accessibility": "public",
+            "static": true,
+            "optional": false,
+            "computed": false,
+            "value": {
+              "type": "FunctionExpression",
+              "function": {
+                "type": "ScriptFunction",
+                "id": {
+                  "type": "Identifier",
+                  "name": "_$init$_",
+                  "decorators": [],
+                  "loc": {
+                    "start": {
+                      "line": 1,
+                      "column": 1
+                    },
+                    "end": {
+                      "line": 1,
+                      "column": 1
+                    }
+                  }
+                },
+                "generator": false,
+                "async": false,
+                "expression": false,
+                "params": [],
+                "body": {
+                  "type": "BlockStatement",
+                  "statements": [],
+                  "loc": {
+                    "start": {
+                      "line": 1,
+                      "column": 1
+                    },
+                    "end": {
+                      "line": 1,
+                      "column": 1
+                    }
+                  }
+                },
+                "loc": {
+                  "start": {
+                    "line": 1,
+                    "column": 1
+                  },
+                  "end": {
+                    "line": 1,
+                    "column": 1
+                  }
+                }
+              },
+              "loc": {
+                "start": {
+                  "line": 1,
+                  "column": 1
+                },
+                "end": {
+                  "line": 1,
+                  "column": 1
+                }
+              }
+            },
+            "overloads": [],
+            "decorators": [],
+            "loc": {
+              "start": {
+                "line": 1,
+                "column": 1
+              },
+              "end": {
+                "line": 1,
+                "column": 1
+              }
+            }
+          }
+        ],
+        "loc": {
+          "start": {
+            "line": 1,
+            "column": 1
+          },
+          "end": {
+            "line": 1,
+            "column": 1
+          }
+        }
+      },
+      "loc": {
+        "start": {
+          "line": 1,
+          "column": 1
+        },
+        "end": {
+          "line": 1,
+          "column": 1
+        }
+      }
+    }
+  ],
+  "loc": {
+    "start": {
+      "line": 1,
+      "column": 1
+    },
+    "end": {
+      "line": 17,
+      "column": 1
+    }
+  }
+}
diff --git a/ets2panda/test/compiler/ets/declare_type_alias.ets b/ets2panda/test/compiler/ets/declare_type_alias.ets
new file mode 100644
index 0000000000000000000000000000000000000000..64ac7d066d5662e61983c27420d4d5d9fcde502a
--- /dev/null
+++ b/ets2panda/test/compiler/ets/declare_type_alias.ets
@@ -0,0 +1,16 @@
+/*
+ * Copyright (c) 2023 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.
+ */
+
+declare type KPointer = number | int;