Typescript index file ext fix

Author: snaerth

lib/index.js

@@ -89,9 +89,8 @@ function createFiles(componentName, componentPath, cssFileExt) {
     const isNative = reactnative || (config && config.includes('reactnative'));
     // File extension
     const ext = isTypeScript ? 'tsx' : 'js';
-
     const jsxExt = 'jsx';
-    const indexFile = `index.${ext}`;
+    const indexFile = `index.${isTypeScript ? 'ts' : 'js'}`;
     let name = componentName;
     const isJsxFile = jsx || (config && config.includes('jsx')) || false;
     const componentFileName = `${name}.${isJsxFile ? jsxExt : ext}`;