Adds transformers for ignored catch parameter

tinganho · tinganho · commit 148a494c90d0 · 2017-07-30T23:26:54.000+02:00
diff --git a/src/compiler/transformers/es2015.ts b/src/compiler/transformers/es2015.ts
@@ -3173,7 +3173,7 @@ namespace ts {
         function visitCatchClause(node: CatchClause): CatchClause {
             const ancestorFacts = enterSubtree(HierarchyFacts.BlockScopeExcludes, HierarchyFacts.BlockScopeIncludes);
             let updated: CatchClause;
-            if (isBindingPattern(node.variableDeclaration.name)) {
+            if (node.variableDeclaration && isBindingPattern(node.variableDeclaration.name)) {
                 const temp = createTempVariable(/*recordTempVariable*/ undefined);
                 const newVariableDeclaration = createVariableDeclaration(temp);
                 setTextRange(newVariableDeclaration, node.variableDeclaration);
diff --git a/src/compiler/transformers/esnext.ts b/src/compiler/transformers/esnext.ts
@@ -101,6 +101,8 @@ namespace ts {
                     return visitExpressionStatement(node as ExpressionStatement);
                 case SyntaxKind.ParenthesizedExpression:
                     return visitParenthesizedExpression(node as ParenthesizedExpression, noDestructuringValue);
+                case SyntaxKind.CatchClause:
+                    return visitCatchClause(node as CatchClause);
                 default:
                     return visitEachChild(node, visitor, context);
             }
@@ -212,6 +214,13 @@ namespace ts {
             return visitEachChild(node, noDestructuringValue ? visitorNoDestructuringValue : visitor, context);
         }
 
+        function visitCatchClause(node: CatchClause): CatchClause {
+            if (!node.variableDeclaration) {
+                return updateCatchClause(node, createVariableDeclaration("_ignoredCatchParameter"), node.block);
+            }
+            return visitEachChild(node, visitor, context);
+        }
+
         /**
          * Visits a BinaryExpression that contains a destructuring assignment.
          *
