From b12a07e35918e5d17be66c5382e9a38b092fae32 Mon Sep 17 00:00:00 2001
From: Anna Henningsen <github@addaleax.net>
Date: Tue, 13 Feb 2018 06:25:14 +0100
Subject: [PATCH] fix: handle instrumentation when a function is called
 Function (#131)

---
 packages/istanbul-lib-instrument/src/visitor.js    |  1 +
 .../test/specs/functions.yaml                      | 14 ++++++++++++++
 2 files changed, 15 insertions(+)

diff --git a/packages/istanbul-lib-instrument/src/visitor.js b/packages/istanbul-lib-instrument/src/visitor.js
index 3cfccee0..5a01cf7e 100644
--- a/packages/istanbul-lib-instrument/src/visitor.js
+++ b/packages/istanbul-lib-instrument/src/visitor.js
@@ -468,6 +468,7 @@ const coverageTemplate = template(`
     var COVERAGE_VAR = (function () {
         var path = PATH,
             hash = HASH,
+            Function = (function(){}).constructor,
             global = (new Function('return this'))(),
             gcv = GLOBAL_COVERAGE_VAR,
             coverageData = INITIAL,
diff --git a/packages/istanbul-lib-instrument/test/specs/functions.yaml b/packages/istanbul-lib-instrument/test/specs/functions.yaml
index 5c33a594..0044d250 100644
--- a/packages/istanbul-lib-instrument/test/specs/functions.yaml
+++ b/packages/istanbul-lib-instrument/test/specs/functions.yaml
@@ -130,3 +130,17 @@ tests:
     functions: {'0': 0, '1': 0, '2': 1, '3': 0}
     statements: {'0': 0, '1': 1, '2': 1, '3': 1}
     guard: isInferredFunctionNameAvailable
+
+---
+name: function named Function
+code: |
+  function Function () {
+    this.x = 42
+  }
+  output = new Function().x
+tests:
+  - name: does not fail if a function is called Function
+    out: 42
+    lines: {'2': 1, '4': 1}
+    functions: {'0': 1}
+    statements: {'0': 1, '1': 1}