From 0980819346ad1c0acb8895e2d0b2eff2f79cdb0e Mon Sep 17 00:00:00 2001
From: Sam Goldman <samgoldman@fb.com>
Date: Mon, 4 Jan 2016 11:37:59 -0800
Subject: [PATCH] Add support for "declare type" Flow syntax

See facebook/flow#1105
---
 src/plugins/flow.js                           |   8 +
 .../flow/declare-statements/14/actual.js      |   2 +
 .../flow/declare-statements/14/expected.json  | 242 ++++++++++++++++++
 3 files changed, 252 insertions(+)
 create mode 100644 test/fixtures/flow/declare-statements/14/actual.js
 create mode 100644 test/fixtures/flow/declare-statements/14/expected.json

diff --git a/src/plugins/flow.js b/src/plugins/flow.js
index 60ccc32264..d3332907bf 100644
--- a/src/plugins/flow.js
+++ b/src/plugins/flow.js
@@ -58,6 +58,8 @@ pp.flowParseDeclare = function (node) {
     return this.flowParseDeclareVariable(node);
   } else if (this.isContextual("module")) {
     return this.flowParseDeclareModule(node);
+  } else if (this.isContextual("type")) {
+    return this.flowParseDeclareTypeAlias(node);
   } else {
     this.unexpected();
   }
@@ -96,6 +98,12 @@ pp.flowParseDeclareModule = function (node) {
   return this.finishNode(node, "DeclareModule");
 };
 
+pp.flowParseDeclareTypeAlias = function (node) {
+  this.next();
+  this.flowParseTypeAlias(node);
+  return this.finishNode(node, "DeclareTypeAlias");
+};
+
 
 // Interfaces
 
diff --git a/test/fixtures/flow/declare-statements/14/actual.js b/test/fixtures/flow/declare-statements/14/actual.js
new file mode 100644
index 0000000000..1b73c9fcd0
--- /dev/null
+++ b/test/fixtures/flow/declare-statements/14/actual.js
@@ -0,0 +1,2 @@
+declare type A = string;
+declare type T<U> = { [k:string]: U };
diff --git a/test/fixtures/flow/declare-statements/14/expected.json b/test/fixtures/flow/declare-statements/14/expected.json
new file mode 100644
index 0000000000..1f5bb9847b
--- /dev/null
+++ b/test/fixtures/flow/declare-statements/14/expected.json
@@ -0,0 +1,242 @@
+{
+  "type": "File",
+  "start": 0,
+  "end": 63,
+  "loc": {
+    "start": {
+      "line": 1,
+      "column": 0
+    },
+    "end": {
+      "line": 2,
+      "column": 38
+    }
+  },
+  "program": {
+    "type": "Program",
+    "start": 0,
+    "end": 63,
+    "loc": {
+      "start": {
+        "line": 1,
+        "column": 0
+      },
+      "end": {
+        "line": 2,
+        "column": 38
+      }
+    },
+    "sourceType": "module",
+    "body": [
+      {
+        "type": "DeclareTypeAlias",
+        "start": 0,
+        "end": 24,
+        "loc": {
+          "start": {
+            "line": 1,
+            "column": 0
+          },
+          "end": {
+            "line": 1,
+            "column": 24
+          }
+        },
+        "id": {
+          "type": "Identifier",
+          "start": 13,
+          "end": 14,
+          "loc": {
+            "start": {
+              "line": 1,
+              "column": 13
+            },
+            "end": {
+              "line": 1,
+              "column": 14
+            }
+          },
+          "name": "A"
+        },
+        "typeParameters": null,
+        "right": {
+          "type": "StringTypeAnnotation",
+          "start": 17,
+          "end": 23,
+          "loc": {
+            "start": {
+              "line": 1,
+              "column": 17
+            },
+            "end": {
+              "line": 1,
+              "column": 23
+            }
+          }
+        }
+      },
+      {
+        "type": "DeclareTypeAlias",
+        "start": 25,
+        "end": 63,
+        "loc": {
+          "start": {
+            "line": 2,
+            "column": 0
+          },
+          "end": {
+            "line": 2,
+            "column": 38
+          }
+        },
+        "id": {
+          "type": "Identifier",
+          "start": 38,
+          "end": 39,
+          "loc": {
+            "start": {
+              "line": 2,
+              "column": 13
+            },
+            "end": {
+              "line": 2,
+              "column": 14
+            }
+          },
+          "name": "T"
+        },
+        "typeParameters": {
+          "type": "TypeParameterDeclaration",
+          "start": 39,
+          "end": 42,
+          "loc": {
+            "start": {
+              "line": 2,
+              "column": 14
+            },
+            "end": {
+              "line": 2,
+              "column": 17
+            }
+          },
+          "params": [
+            {
+              "type": "Identifier",
+              "start": 40,
+              "end": 41,
+              "loc": {
+                "start": {
+                  "line": 2,
+                  "column": 15
+                },
+                "end": {
+                  "line": 2,
+                  "column": 16
+                }
+              },
+              "name": "U"
+            }
+          ]
+        },
+        "right": {
+          "type": "ObjectTypeAnnotation",
+          "start": 45,
+          "end": 62,
+          "loc": {
+            "start": {
+              "line": 2,
+              "column": 20
+            },
+            "end": {
+              "line": 2,
+              "column": 37
+            }
+          },
+          "callProperties": [],
+          "properties": [],
+          "indexers": [
+            {
+              "type": "ObjectTypeIndexer",
+              "start": 47,
+              "end": 60,
+              "loc": {
+                "start": {
+                  "line": 2,
+                  "column": 22
+                },
+                "end": {
+                  "line": 2,
+                  "column": 35
+                }
+              },
+              "id": {
+                "type": "Identifier",
+                "start": 48,
+                "end": 49,
+                "loc": {
+                  "start": {
+                    "line": 2,
+                    "column": 23
+                  },
+                  "end": {
+                    "line": 2,
+                    "column": 24
+                  }
+                },
+                "name": "k"
+              },
+              "key": {
+                "type": "StringTypeAnnotation",
+                "start": 50,
+                "end": 56,
+                "loc": {
+                  "start": {
+                    "line": 2,
+                    "column": 25
+                  },
+                  "end": {
+                    "line": 2,
+                    "column": 31
+                  }
+                }
+              },
+              "value": {
+                "type": "GenericTypeAnnotation",
+                "start": 59,
+                "end": 60,
+                "loc": {
+                  "start": {
+                    "line": 2,
+                    "column": 34
+                  },
+                  "end": {
+                    "line": 2,
+                    "column": 35
+                  }
+                },
+                "typeParameters": null,
+                "id": {
+                  "type": "Identifier",
+                  "start": 59,
+                  "end": 60,
+                  "loc": {
+                    "start": {
+                      "line": 2,
+                      "column": 34
+                    },
+                    "end": {
+                      "line": 2,
+                      "column": 35
+                    }
+                  },
+                  "name": "U"
+                }
+              }
+            }
+          ]
+        }
+      }
+    ],
+    "directives": []
+  }
+}
\ No newline at end of file