[Bug] Fix hoisting of if statement alternate

Siubaak · May 7, 2020 · a801707 · a801707
1 parent 4022862
commit a801707
Showing 1 changed file with 3 additions and 1 deletion.
diff --git a/src/evaluate/helper.ts b/src/evaluate/helper.ts
@@ -70,7 +70,9 @@ function* hoistVarRecursion(statement: estree.Statement, scope: Scope): Iterable
       break
     case 'IfStatement':
       yield* hoistVarRecursion(statement.consequent, scope)
-      yield* hoistVarRecursion(statement.alternate, scope)
+      if (statement.alternate) {
+        yield* hoistVarRecursion(statement.alternate, scope)
+      }
       break
     case 'BlockStatement':
       for (let i = 0; i < statement.body.length; i++) {