Only set output variable when unset

parcel-bundler · Apr 20, 2022 · 7b1b9c2 · 7b1b9c2
1 parent f263bdd
commit 7b1b9c2
Showing 1 changed file with 6 additions and 4 deletions.
diff --git a/packages/core/test-utils/src/utils.js b/packages/core/test-utils/src/utils.js
@@ -334,10 +334,12 @@ export async function runBundles(
   // $FlowFixMe[prop-missing]
   ctx.sideEffectNoop = () => {};
 
-  // The output variable is used to pass results of the tests. Define it so that reassigning
-  // it doesn't fail in strict mode.
-  // $FlowFixMe[prop-missing]
-  ctx.output = undefined;
+  if (!('output' in ctx)) {
+    // The output variable is used to pass results of the tests. Define it so that reassigning
+    // it doesn't fail in strict mode.
+    // $FlowFixMe[prop-missing]
+    ctx.output = undefined;
+  }
 
   vm.createContext(ctx);
   let esmOutput;