TypeScript: Support type arguments on JSX opening and self-closing tags (#7799)

packages/babel-generator/src/generators/jsx.js

@@ -73,6 +73,7 @@ function spaceSeparator() {
 export function JSXOpeningElement(node: Object) {
   this.token("<");
   this.print(node.name, node);
+  this.print(node.typeParameters, node); // TS
   if (node.attributes.length > 0) {
     this.space();
     this.printJoin(node.attributes, node, { separator: spaceSeparator });