From 6202c8890178aba8185ad3110dea6f1972743393 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Hu=C3=A1ng=20J=C3=B9nli=C3=A0ng?=
 <JLHwung@users.noreply.github.com>
Date: Thu, 31 May 2018 08:32:40 +0800
Subject: [PATCH] fix: parenthesize superClass on non-idetifier case (#158)

---
 packages/istanbul-lib-instrument/src/visitor.js     | 12 ++++++------
 packages/istanbul-lib-instrument/test/varia.test.js |  8 ++++++++
 2 files changed, 14 insertions(+), 6 deletions(-)

diff --git a/packages/istanbul-lib-instrument/src/visitor.js b/packages/istanbul-lib-instrument/src/visitor.js
index 7057aedc..2a1b6b6b 100644
--- a/packages/istanbul-lib-instrument/src/visitor.js
+++ b/packages/istanbul-lib-instrument/src/visitor.js
@@ -339,16 +339,16 @@ function blockProp(prop) {
     };
 }
 
-function makeParenthesizedExpression(path) {
-  var T = this.types;
-  if (path.node) {
-    path.replaceWith(T.parenthesizedExpression(path.node));
-  }
+function makeParenthesizedExpressionForNonIdentifier(path) {
+    var T = this.types;
+    if (path.node && !path.isIdentifier()) {
+        path.replaceWith(T.parenthesizedExpression(path.node));
+    }
 }
 
 function parenthesizedExpressionProp(prop) {
     return function (path) {
-        makeParenthesizedExpression.call(this, path.get(prop));
+        makeParenthesizedExpressionForNonIdentifier.call(this, path.get(prop));
     };
 }
 
diff --git a/packages/istanbul-lib-instrument/test/varia.test.js b/packages/istanbul-lib-instrument/test/varia.test.js
index 45045bf9..c19adc76 100644
--- a/packages/istanbul-lib-instrument/test/varia.test.js
+++ b/packages/istanbul-lib-instrument/test/varia.test.js
@@ -142,4 +142,12 @@ describe('varia', function () {
         code = v.getGeneratedCode();
         assert.ok(code.match(/cov_(.+);export class App extends/));
     });
+
+    it('does not add extra parenthesis when superclass is an identifier', function () {
+        var v = verifier.create('class App extends Component {};', { generateOnly: true }),
+            code;
+        assert.ok(!v.err);
+        code = v.getGeneratedCode();
+        assert.ok(code.match(/cov_(.+);class App extends Component/));
+    });
 });