Stricten the JSX check

Author: CompuIves

packages/app/src/sandbox/eval/transpilers/babel/check.js

@@ -1,6 +1,6 @@
 import isESModule from '../../utils/is-es-module';
 
-const JSXSyntax = /<\w/;
+const JSXSyntax = /<\w(.|\n)*\/?>/;
 
 export function shouldTranspile(code: string, path: string) {
   return isESModule(code) || JSXSyntax.test(code);