From b69dc51be0cdb6a959f9d9b43aa085449c6dcda9 Mon Sep 17 00:00:00 2001
From: Brian Ng <bng412@gmail.com>
Date: Mon, 23 Jan 2017 10:45:57 -0600
Subject: [PATCH] Fix missing parens when function expressions is tag (#5193)

---
 .../babel-generator/src/node/parentheses.js   | 22 ++++++++++---------
 .../tagged-template-expression/actual.js      |  2 ++
 .../tagged-template-expression/expected.js    |  2 ++
 3 files changed, 16 insertions(+), 10 deletions(-)
 create mode 100644 packages/babel-generator/test/fixtures/parentheses/tagged-template-expression/actual.js
 create mode 100644 packages/babel-generator/test/fixtures/parentheses/tagged-template-expression/expected.js

diff --git a/packages/babel-generator/src/node/parentheses.js b/packages/babel-generator/src/node/parentheses.js
index e6424aced6..4da106ce99 100644
--- a/packages/babel-generator/src/node/parentheses.js
+++ b/packages/babel-generator/src/node/parentheses.js
@@ -170,16 +170,14 @@ export function FunctionExpression(node: Object, parent: Object, printStack: Arr
 }
 
 export function ArrowFunctionExpression(node: Object, parent: Object): boolean {
-  // export default (function () {});
-  if (t.isExportDeclaration(parent)) {
-    return true;
-  }
-
-  if (t.isBinaryExpression(parent) || t.isLogicalExpression(parent)) {
-    return true;
-  }
-
-  if (t.isUnaryExpression(parent)) {
+  if (
+    // export default (function () {});
+    t.isExportDeclaration(parent) ||
+    t.isBinaryExpression(parent) ||
+    t.isLogicalExpression(parent) ||
+    t.isUnaryExpression(parent) ||
+    t.isTaggedTemplateExpression(parent)
+  ) {
     return true;
   }
 
@@ -225,6 +223,10 @@ function isFirstInStatement(printStack: Array<Object>, {
       return true;
     }
 
+    if (t.isTaggedTemplateExpression(parent)) {
+      return true;
+    }
+
     if (considerDefaultExports && t.isExportDefaultDeclaration(parent, { declaration: node })) {
       return true;
     }
diff --git a/packages/babel-generator/test/fixtures/parentheses/tagged-template-expression/actual.js b/packages/babel-generator/test/fixtures/parentheses/tagged-template-expression/actual.js
new file mode 100644
index 0000000000..8a19f04a89
--- /dev/null
+++ b/packages/babel-generator/test/fixtures/parentheses/tagged-template-expression/actual.js
@@ -0,0 +1,2 @@
+(() => {})``;
+(function(){}``);
diff --git a/packages/babel-generator/test/fixtures/parentheses/tagged-template-expression/expected.js b/packages/babel-generator/test/fixtures/parentheses/tagged-template-expression/expected.js
new file mode 100644
index 0000000000..f47cd2e9af
--- /dev/null
+++ b/packages/babel-generator/test/fixtures/parentheses/tagged-template-expression/expected.js
@@ -0,0 +1,2 @@
+(() => {})``;
+(function () {})``;
\ No newline at end of file