Disable @babel/plugin-transform-block-scoping "throwIfClosureRequired…

…" option for tests
facebook · Aug 15, 2019 · 4c4f5fd · 4c4f5fd
1 parent 41db902
commit 4c4f5fd
Showing 1 changed file with 4 additions and 0 deletions.
diff --git a/scripts/jest/preprocessor.js b/scripts/jest/preprocessor.js
@@ -40,6 +40,10 @@ const babelOptions = {
     require.resolve('@babel/plugin-transform-react-jsx-source'),
 
     require.resolve('../babel/transform-prevent-infinite-loops'),
+
+    // This optimization is important for extremely performance-sensitive (e.g. React source).
+    // It's okay to disable it for tests.
+    [require.resolve('@babel/plugin-transform-block-scoping'), {throwIfClosureRequired: false}],
   ],
   retainLines: true,
 };