fix(coverage): istanbul crashes when no tests were run (#2753)

AriPerkkio · web-flow · commit ebc95adddda4 · 2023-01-27T12:33:10.000+01:00
diff --git a/packages/coverage-istanbul/src/provider.ts b/packages/coverage-istanbul/src/provider.ts
@@ -105,7 +105,7 @@ export class IstanbulCoverageProvider implements CoverageProvider {
       const map = libCoverage.createCoverageMap(coverage)
       map.merge(previousCoverageMap)
       return map
-    }, {})
+    }, libCoverage.createCoverageMap({}))
 
     if (this.options.all && allTestsRun)
       await this.includeUntestedFiles(mergedCoverage)
