fix(core): undefined reference error in coverage recording

Allow for the `baseline` to be `undefined` after loading the first test files in initial test run.
stryker-mutator · Nov 7, 2019 · 0a68c9c · 0a68c9c
1 parent 4422086
commit 0a68c9c
Showing 1 changed file with 2 additions and 2 deletions.
diff --git a/packages/core/src/transpiler/coverageHooks.ts b/packages/core/src/transpiler/coverageHooks.ts
@@ -36,13 +36,13 @@ Object.keys(coveragePerFile).forEach(function (file) {
     var fileResult = { s: {}, f: {} };
     var touchedFile = false;
     for(var i in coverage.s){
-      if(coverage.s[i] !== baseline.s[i]){
+      if(!baseline || coverage.s[i] !== baseline.s[i]){
         fileResult.s[i] = coverage.s[i];
         touchedFile = true;
       }
     }
     for(var i in coverage.f){
-      if(coverage.f[i] !== baseline.f[i]){
+      if(!baseline || coverage.f[i] !== baseline.f[i]){
         fileResult.f[i] = coverage.f[i];
         touchedFile = true;
       }