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 });

packages/babel-generator/test/fixtures/typescript/type-arguments-tsx/input.js

@@ -0,0 +1,2 @@
+<C<number>></C>;
+<C<number>/>;

packages/babel-generator/test/fixtures/typescript/type-arguments-tsx/options.json

@@ -0,0 +1,4 @@
+{
+  "plugins": ["jsx", "typescript"],
+  "sourceType": "module"
+}

packages/babel-generator/test/fixtures/typescript/type-arguments-tsx/output.js

@@ -0,0 +1,2 @@
+<C<number>></C>;
+<C<number> />;