Revert "Make JSX check for shouldTranspile far more aggressive"

This reverts commit 47419bc.

Author: lbogdan

packages/app/src/sandbox/eval/presets/create-react-app/index.js

@@ -25,12 +25,7 @@ export default function initialize() {
             configurations &&
               configurations.package &&
               configurations.package.parsed &&
-              configurations.package.parsed.dependencies,
-
-            configurations &&
-              configurations.package &&
-              configurations.package.parsed &&
-              configurations.package.parsed.devDependencies
+              configurations.package.parsed.dependencies
           ) &&
           !v2Initialized
         ) {

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

@@ -1,29 +1,7 @@
 import isESModule from '../../utils/is-es-module';
 
-const JSXSyntax = /(.*)<\w(.|\n)*?\/?>/;
+const JSXSyntax = /<\w(.|\n)*\/?>/;
 
 export function shouldTranspile(code: string, path: string) {
-  if (isESModule(code)) {
-    return true;
-  }
-
-  const match = code.match(JSXSyntax);
-  if (match) {
-    const startOfLine = match[1];
-
-    // If it's in a comment or string, we're extremely aggressive here because
-    // transpiling is absolutely our last resort.
-    if (
-      startOfLine.indexOf('//') > -1 ||
-      startOfLine.indexOf('*') > -1 ||
-      startOfLine.indexOf("'") > -1 ||
-      startOfLine.indexOf('"') > -1 ||
-      startOfLine.indexOf('`') > -1
-    ) {
-      return false;
-    }
-
-    return true;
-  }
-  return false;
+  return isESModule(code) || JSXSyntax.test(code);
 }

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

@@ -1,9 +1,10 @@
 import semver from 'semver';
 
 function isCRAVersion2(dependencies, devDependencies) {
-  const reactScriptsVersion =
-    dependencies['react-scripts'] || devDependencies['react-scripts'];
-  if (reactScriptsVersion) {
+  const usedDeps = { ...dependencies, ...devDependencies };
+  if (usedDeps['react-scripts']) {
+    const reactScriptsVersion = usedDeps['react-scripts'];
+
     return (
       /^[a-z]/.test(reactScriptsVersion) ||
       semver.intersects(reactScriptsVersion, '^2.0.0')