vendor tsgo

tools/tsgo/internal/transformers/estransforms/optionalcatch.go

@@ -0,0 +1,37 @@
+package estransforms
+
+import (
+	"github.com/microsoft/typescript-go/internal/ast"
+	"github.com/microsoft/typescript-go/internal/transformers"
+)
+
+type optionalCatchTransformer struct {
+	transformers.Transformer
+}
+
+func (ch *optionalCatchTransformer) visit(node *ast.Node) *ast.Node {
+	if node.SubtreeFacts()&ast.SubtreeContainsMissingCatchClauseVariable == 0 {
+		return node
+	}
+	switch node.Kind {
+	case ast.KindCatchClause:
+		return ch.visitCatchClause(node.AsCatchClause())
+	default:
+		return ch.Visitor().VisitEachChild(node)
+	}
+}
+
+func (ch *optionalCatchTransformer) visitCatchClause(node *ast.CatchClause) *ast.Node {
+	if node.VariableDeclaration == nil {
+		return ch.Factory().NewCatchClause(
+			ch.Factory().NewVariableDeclaration(ch.Factory().NewTempVariable(), nil, nil, nil),
+			ch.Visitor().Visit(node.Block),
+		)
+	}
+	return ch.Visitor().VisitEachChild(node.AsNode())
+}
+
+func newOptionalCatchTransformer(opts *transformers.TransformOptions) *transformers.Transformer {
+	tx := &optionalCatchTransformer{}
+	return tx.NewTransformer(tx.visit, opts.Context)
+}