From 86245a83a2e58fc0bbbe28b9bf9a4b77a53ea5b3 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Hu=C3=A1ng=20J=C3=B9nli=C3=A0ng?= <jlhwung@gmail.com>
Date: Mon, 30 Dec 2019 16:10:19 -0500
Subject: [PATCH] TSTypeCastExpression should not be inside call parameters
 (#10939)

---
 .../src/plugins/typescript/index.js           |   6 +-
 .../cast/parameter-typecast/input.ts          |   1 +
 .../cast/parameter-typecast/output.json       | 166 ++++++++++++++++++
 3 files changed, 168 insertions(+), 5 deletions(-)
 create mode 100644 packages/babel-parser/test/fixtures/typescript/cast/parameter-typecast/input.ts
 create mode 100644 packages/babel-parser/test/fixtures/typescript/cast/parameter-typecast/output.json

diff --git a/packages/babel-parser/src/plugins/typescript/index.js b/packages/babel-parser/src/plugins/typescript/index.js
index 2b442620a507..0c740b2c9bdd 100644
--- a/packages/babel-parser/src/plugins/typescript/index.js
+++ b/packages/babel-parser/src/plugins/typescript/index.js
@@ -2568,11 +2568,7 @@ export default (superClass: Class<Parser>): Class<Parser> =>
     ): $ReadOnlyArray<?N.Expression> {
       for (let i = 0; i < exprList.length; i++) {
         const expr = exprList[i];
-        if (
-          expr &&
-          expr._exprListItem &&
-          expr.type === "TsTypeCastExpression"
-        ) {
+        if (expr && expr.type === "TSTypeCastExpression") {
           this.raise(expr.start, "Did not expect a type annotation here.");
         }
       }
diff --git a/packages/babel-parser/test/fixtures/typescript/cast/parameter-typecast/input.ts b/packages/babel-parser/test/fixtures/typescript/cast/parameter-typecast/input.ts
new file mode 100644
index 000000000000..c494cc00bc39
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/typescript/cast/parameter-typecast/input.ts
@@ -0,0 +1 @@
+func(a: T);
diff --git a/packages/babel-parser/test/fixtures/typescript/cast/parameter-typecast/output.json b/packages/babel-parser/test/fixtures/typescript/cast/parameter-typecast/output.json
new file mode 100644
index 000000000000..d815e81603d1
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/typescript/cast/parameter-typecast/output.json
@@ -0,0 +1,166 @@
+{
+  "type": "File",
+  "start": 0,
+  "end": 11,
+  "loc": {
+    "start": {
+      "line": 1,
+      "column": 0
+    },
+    "end": {
+      "line": 1,
+      "column": 11
+    }
+  },
+  "errors": [
+    "SyntaxError: Did not expect a type annotation here. (1:5)"
+  ],
+  "program": {
+    "type": "Program",
+    "start": 0,
+    "end": 11,
+    "loc": {
+      "start": {
+        "line": 1,
+        "column": 0
+      },
+      "end": {
+        "line": 1,
+        "column": 11
+      }
+    },
+    "sourceType": "module",
+    "interpreter": null,
+    "body": [
+      {
+        "type": "ExpressionStatement",
+        "start": 0,
+        "end": 11,
+        "loc": {
+          "start": {
+            "line": 1,
+            "column": 0
+          },
+          "end": {
+            "line": 1,
+            "column": 11
+          }
+        },
+        "expression": {
+          "type": "CallExpression",
+          "start": 0,
+          "end": 10,
+          "loc": {
+            "start": {
+              "line": 1,
+              "column": 0
+            },
+            "end": {
+              "line": 1,
+              "column": 10
+            }
+          },
+          "callee": {
+            "type": "Identifier",
+            "start": 0,
+            "end": 4,
+            "loc": {
+              "start": {
+                "line": 1,
+                "column": 0
+              },
+              "end": {
+                "line": 1,
+                "column": 4
+              },
+              "identifierName": "func"
+            },
+            "name": "func"
+          },
+          "arguments": [
+            {
+              "type": "TSTypeCastExpression",
+              "start": 5,
+              "end": 9,
+              "loc": {
+                "start": {
+                  "line": 1,
+                  "column": 5
+                },
+                "end": {
+                  "line": 1,
+                  "column": 9
+                }
+              },
+              "expression": {
+                "type": "Identifier",
+                "start": 5,
+                "end": 6,
+                "loc": {
+                  "start": {
+                    "line": 1,
+                    "column": 5
+                  },
+                  "end": {
+                    "line": 1,
+                    "column": 6
+                  },
+                  "identifierName": "a"
+                },
+                "name": "a"
+              },
+              "typeAnnotation": {
+                "type": "TSTypeAnnotation",
+                "start": 6,
+                "end": 9,
+                "loc": {
+                  "start": {
+                    "line": 1,
+                    "column": 6
+                  },
+                  "end": {
+                    "line": 1,
+                    "column": 9
+                  }
+                },
+                "typeAnnotation": {
+                  "type": "TSTypeReference",
+                  "start": 8,
+                  "end": 9,
+                  "loc": {
+                    "start": {
+                      "line": 1,
+                      "column": 8
+                    },
+                    "end": {
+                      "line": 1,
+                      "column": 9
+                    }
+                  },
+                  "typeName": {
+                    "type": "Identifier",
+                    "start": 8,
+                    "end": 9,
+                    "loc": {
+                      "start": {
+                        "line": 1,
+                        "column": 8
+                      },
+                      "end": {
+                        "line": 1,
+                        "column": 9
+                      },
+                      "identifierName": "T"
+                    },
+                    "name": "T"
+                  }
+                }
+              }
+            }
+          ]
+        }
+      }
+    ],
+    "directives": []
+  }
+}
\ No newline at end of file