NEXT-29105 - allow ts files in storefront

Added a webpack extension alias for paths that end with .js
If a file path ends with .js it will first check if there
is a typescript file otherwise it will grab the js file.
This allows us to use typescript in the storefront without
breaking plugins that use paths that end with .js

changelog/_unreleased/2023-07-06-allow-typescript-in-the-storefront.md

@@ -0,0 +1,6 @@
+---
+title: Allow typescript in the storefront
+issue: NEXT-29105
+---
+# Storefront
+* Added extension alias in webpack config for javascript files to check for typescript files first and then javascript files

src/Storefront/Resources/app/storefront/webpack.config.js

@@ -324,6 +324,9 @@ let webpackConfig = {
     ],
     resolve: {
         extensions: [ '.ts', '.tsx', '.js', '.jsx', '.json', '.less', '.sass', '.scss', '.twig' ],
+        extensionAlias: {
+            '.js': ['.ts', '.js'],
+        },
         modules: [
             // statically add the storefront node_modules folder, so sw plugins can resolve it
             path.resolve(__dirname, 'node_modules'),