From ad0c81f39445ceca8d4f475cd08092e9f66eee1f Mon Sep 17 00:00:00 2001
From: AriPerkkio <ari.perkkio@gmail.com>
Date: Thu, 20 Apr 2023 13:26:22 +0300
Subject: [PATCH] fix(coverage): throw error if fail to load built-in provider

---
 packages/vitest/src/integrations/coverage.ts | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/packages/vitest/src/integrations/coverage.ts b/packages/vitest/src/integrations/coverage.ts
index 95b81af656ad..983334fafd20 100644
--- a/packages/vitest/src/integrations/coverage.ts
+++ b/packages/vitest/src/integrations/coverage.ts
@@ -17,6 +17,10 @@ async function resolveCoverageProviderModule(options: CoverageOptions | undefine
 
   if (provider === 'c8' || provider === 'istanbul') {
     const { default: coverageModule } = await loader.executeId(CoverageProviderMap[provider])
+
+    if (!coverageModule)
+      throw new Error(`Failed to load ${CoverageProviderMap[provider]}. Default export is missing.`)
+
     return coverageModule
   }