diff --git a/lib/ast-converter.js b/lib/ast-converter.js
index b63aa32..545aa80 100644
--- a/lib/ast-converter.js
+++ b/lib/ast-converter.js
@@ -1778,6 +1778,19 @@ module.exports = function(ast, extra) {
             case SyntaxKind.ParenthesizedExpression:
                 return convert(node.expression, parent);
 
+            /**
+             * Convert TypeAliasDeclaration node into VariableDeclaration
+             * to allow core rules such as "semi" to work automatically
+             */
+            case SyntaxKind.TypeAliasDeclaration:
+                deeplyCopy();
+                assign(result, {
+                    type: "VariableDeclaration",
+                    kind: "type",
+                    declarations: []
+                });
+                break;
+
             default:
                 deeplyCopy();
         }
diff --git a/tests/fixtures/typescript/basics/type-alias-declaration.result.js b/tests/fixtures/typescript/basics/type-alias-declaration.result.js
new file mode 100644
index 0000000..af8e9a7
--- /dev/null
+++ b/tests/fixtures/typescript/basics/type-alias-declaration.result.js
@@ -0,0 +1,461 @@
+module.exports = {
+    "type": "Program",
+    "range": [
+        0,
+        37
+    ],
+    "loc": {
+        "start": {
+            "line": 1,
+            "column": 0
+        },
+        "end": {
+            "line": 1,
+            "column": 37
+        }
+    },
+    "body": [
+        {
+            "type": "VariableDeclaration",
+            "kind": "type",
+            "declarations": [],
+            "range": [
+                0,
+                37
+            ],
+            "loc": {
+                "start": {
+                    "line": 1,
+                    "column": 0
+                },
+                "end": {
+                    "line": 1,
+                    "column": 37
+                }
+            },
+            "flags": 0,
+            "name": {
+                "type": "Identifier",
+                "range": [
+                    5,
+                    11
+                ],
+                "loc": {
+                    "start": {
+                        "line": 1,
+                        "column": 5
+                    },
+                    "end": {
+                        "line": 1,
+                        "column": 11
+                    }
+                },
+                "name": "Result"
+            },
+            "typeParameters": [
+                {
+                    "type": "TSTypeParameter",
+                    "range": [
+                        12,
+                        13
+                    ],
+                    "loc": {
+                        "start": {
+                            "line": 1,
+                            "column": 12
+                        },
+                        "end": {
+                            "line": 1,
+                            "column": 13
+                        }
+                    },
+                    "flags": 0,
+                    "name": {
+                        "type": "Identifier",
+                        "range": [
+                            12,
+                            13
+                        ],
+                        "loc": {
+                            "start": {
+                                "line": 1,
+                                "column": 12
+                            },
+                            "end": {
+                                "line": 1,
+                                "column": 13
+                            }
+                        },
+                        "name": "T"
+                    }
+                }
+            ],
+            "typeAnnotation": {
+                "type": "TypeAnnotation",
+                "loc": {
+                    "start": {
+                        "line": 1,
+                        "column": 17
+                    },
+                    "end": {
+                        "line": 1,
+                        "column": 37
+                    }
+                },
+                "range": [
+                    17,
+                    37
+                ],
+                "typeAnnotation": {
+                    "type": "TSUnionType",
+                    "range": [
+                        17,
+                        37
+                    ],
+                    "loc": {
+                        "start": {
+                            "line": 1,
+                            "column": 17
+                        },
+                        "end": {
+                            "line": 1,
+                            "column": 37
+                        }
+                    },
+                    "flags": 0,
+                    "types": [
+                        {
+                            "type": "TSTypeReference",
+                            "range": [
+                                17,
+                                27
+                            ],
+                            "loc": {
+                                "start": {
+                                    "line": 1,
+                                    "column": 17
+                                },
+                                "end": {
+                                    "line": 1,
+                                    "column": 27
+                                }
+                            },
+                            "flags": 0,
+                            "typeName": {
+                                "type": "Identifier",
+                                "range": [
+                                    17,
+                                    24
+                                ],
+                                "loc": {
+                                    "start": {
+                                        "line": 1,
+                                        "column": 17
+                                    },
+                                    "end": {
+                                        "line": 1,
+                                        "column": 24
+                                    }
+                                },
+                                "name": "Success"
+                            },
+                            "typeArguments": [
+                                {
+                                    "type": "TSTypeReference",
+                                    "range": [
+                                        25,
+                                        26
+                                    ],
+                                    "loc": {
+                                        "start": {
+                                            "line": 1,
+                                            "column": 25
+                                        },
+                                        "end": {
+                                            "line": 1,
+                                            "column": 26
+                                        }
+                                    },
+                                    "flags": 0,
+                                    "typeName": {
+                                        "type": "Identifier",
+                                        "range": [
+                                            25,
+                                            26
+                                        ],
+                                        "loc": {
+                                            "start": {
+                                                "line": 1,
+                                                "column": 25
+                                            },
+                                            "end": {
+                                                "line": 1,
+                                                "column": 26
+                                            }
+                                        },
+                                        "name": "T"
+                                    }
+                                }
+                            ]
+                        },
+                        {
+                            "type": "TSTypeReference",
+                            "range": [
+                                30,
+                                37
+                            ],
+                            "loc": {
+                                "start": {
+                                    "line": 1,
+                                    "column": 30
+                                },
+                                "end": {
+                                    "line": 1,
+                                    "column": 37
+                                }
+                            },
+                            "flags": 0,
+                            "typeName": {
+                                "type": "Identifier",
+                                "range": [
+                                    30,
+                                    37
+                                ],
+                                "loc": {
+                                    "start": {
+                                        "line": 1,
+                                        "column": 30
+                                    },
+                                    "end": {
+                                        "line": 1,
+                                        "column": 37
+                                    }
+                                },
+                                "name": "Failure"
+                            }
+                        }
+                    ]
+                }
+            }
+        }
+    ],
+    "sourceType": "script",
+    "tokens": [
+        {
+            "type": "Identifier",
+            "value": "type",
+            "range": [
+                0,
+                4
+            ],
+            "loc": {
+                "start": {
+                    "line": 1,
+                    "column": 0
+                },
+                "end": {
+                    "line": 1,
+                    "column": 4
+                }
+            }
+        },
+        {
+            "type": "Identifier",
+            "value": "Result",
+            "range": [
+                5,
+                11
+            ],
+            "loc": {
+                "start": {
+                    "line": 1,
+                    "column": 5
+                },
+                "end": {
+                    "line": 1,
+                    "column": 11
+                }
+            }
+        },
+        {
+            "type": "Punctuator",
+            "value": "<",
+            "range": [
+                11,
+                12
+            ],
+            "loc": {
+                "start": {
+                    "line": 1,
+                    "column": 11
+                },
+                "end": {
+                    "line": 1,
+                    "column": 12
+                }
+            }
+        },
+        {
+            "type": "Identifier",
+            "value": "T",
+            "range": [
+                12,
+                13
+            ],
+            "loc": {
+                "start": {
+                    "line": 1,
+                    "column": 12
+                },
+                "end": {
+                    "line": 1,
+                    "column": 13
+                }
+            }
+        },
+        {
+            "type": "Punctuator",
+            "value": ">",
+            "range": [
+                13,
+                14
+            ],
+            "loc": {
+                "start": {
+                    "line": 1,
+                    "column": 13
+                },
+                "end": {
+                    "line": 1,
+                    "column": 14
+                }
+            }
+        },
+        {
+            "type": "Punctuator",
+            "value": "=",
+            "range": [
+                15,
+                16
+            ],
+            "loc": {
+                "start": {
+                    "line": 1,
+                    "column": 15
+                },
+                "end": {
+                    "line": 1,
+                    "column": 16
+                }
+            }
+        },
+        {
+            "type": "Identifier",
+            "value": "Success",
+            "range": [
+                17,
+                24
+            ],
+            "loc": {
+                "start": {
+                    "line": 1,
+                    "column": 17
+                },
+                "end": {
+                    "line": 1,
+                    "column": 24
+                }
+            }
+        },
+        {
+            "type": "Punctuator",
+            "value": "<",
+            "range": [
+                24,
+                25
+            ],
+            "loc": {
+                "start": {
+                    "line": 1,
+                    "column": 24
+                },
+                "end": {
+                    "line": 1,
+                    "column": 25
+                }
+            }
+        },
+        {
+            "type": "Identifier",
+            "value": "T",
+            "range": [
+                25,
+                26
+            ],
+            "loc": {
+                "start": {
+                    "line": 1,
+                    "column": 25
+                },
+                "end": {
+                    "line": 1,
+                    "column": 26
+                }
+            }
+        },
+        {
+            "type": "Punctuator",
+            "value": ">",
+            "range": [
+                26,
+                27
+            ],
+            "loc": {
+                "start": {
+                    "line": 1,
+                    "column": 26
+                },
+                "end": {
+                    "line": 1,
+                    "column": 27
+                }
+            }
+        },
+        {
+            "type": "Punctuator",
+            "value": "|",
+            "range": [
+                28,
+                29
+            ],
+            "loc": {
+                "start": {
+                    "line": 1,
+                    "column": 28
+                },
+                "end": {
+                    "line": 1,
+                    "column": 29
+                }
+            }
+        },
+        {
+            "type": "Identifier",
+            "value": "Failure",
+            "range": [
+                30,
+                37
+            ],
+            "loc": {
+                "start": {
+                    "line": 1,
+                    "column": 30
+                },
+                "end": {
+                    "line": 1,
+                    "column": 37
+                }
+            }
+        }
+    ]
+};
diff --git a/tests/fixtures/typescript/basics/type-alias-declaration.src.ts b/tests/fixtures/typescript/basics/type-alias-declaration.src.ts
new file mode 100644
index 0000000..c2067d8
--- /dev/null
+++ b/tests/fixtures/typescript/basics/type-alias-declaration.src.ts
@@ -0,0 +1 @@
+type Result<T> = Success<T> | Failure
\ No newline at end of file