From 06407d705a455fc13aa394dfd68020f62afd06d3 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Hu=C3=A1ng=20J=C3=B9nli=C3=A0ng?= <jlhwung@gmail.com>
Date: Wed, 12 Aug 2020 14:29:55 -0400
Subject: [PATCH] fix: remove inputSourceMap before instrumenting

---
 packages/istanbul-lib-instrument/src/visitor.js | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/packages/istanbul-lib-instrument/src/visitor.js b/packages/istanbul-lib-instrument/src/visitor.js
index ad526e82..c81a46c2 100644
--- a/packages/istanbul-lib-instrument/src/visitor.js
+++ b/packages/istanbul-lib-instrument/src/visitor.js
@@ -632,6 +632,10 @@ function programVisitor(types, sourceFilePath = 'unknown.js', opts = {}) {
                     sourceMappingURL: visitState.sourceMappingURL
                 };
             }
+            const { inputSourceMap } = coverageData;
+            // remove `inputSourceMap` before we output coverage data to source code
+            // because it is not a plain object
+            delete coverageData.inputSourceMap;
             coverageData[MAGIC_KEY] = MAGIC_VALUE;
             const hash = createHash(SHA)
                 .update(JSON.stringify(coverageData))
@@ -640,6 +644,10 @@ function programVisitor(types, sourceFilePath = 'unknown.js', opts = {}) {
             const coverageNode = T.valueToNode(coverageData);
             delete coverageData[MAGIC_KEY];
             delete coverageData.hash;
+            // restore `inputSourceMap`
+            if (inputSourceMap) {
+              coverageData.inputSourceMap = inputSourceMap;
+            }
             let gvTemplate;
             if (opts.coverageGlobalScopeFunc) {
                 if (path.scope.getBinding('Function')) {