fix: handle edge-case surrounding merging two file coverage reports

istanbuljs-archived-repos · Jan 18, 2017 · 22e154c · 22e154c
1 parent 6c9c65e
commit 22e154c
Showing 1 changed file with 4 additions and 0 deletions.
diff --git a/lib/file.js b/lib/file.js
@@ -250,6 +250,10 @@ FileCoverage.prototype.merge = function (other) {
         var i,
             retArray = that.data.b[k],
             secondArray = other.b[k];
+        if (!retArray) {
+            that.data.b[k] = secondArray;
+            return;
+        }
         for (i = 0; i < retArray.length; i += 1) {
             retArray[i] += secondArray[i];
         }