Support gts/gjs in blueprint (#1013)

* Support gts/gts in blueprint

* Update blueprint

Author: mkszepp

ember-basic-dropdown/blueprints/ember-basic-dropdown/index.js

@@ -49,6 +49,12 @@ module.exports = {
         if (!fs.existsSync(file)) {
           file = path.join('app', `app.ts`);
         }
+        if (!fs.existsSync(file)) {
+          file = path.join('app', `app.gts`);
+        }
+        if (!fs.existsSync(file)) {
+          file = path.join('app', `app.gjs`);
+        }
         if (fs.existsSync(file)) {
           this.ui.writeLine(`Added import statement to ${file}`);
           promises.push(
@@ -71,6 +77,24 @@ module.exports = {
           {},
         ),
       );
+    } else {
+      applicationFile = path.join(templatePath, `application.gts`);
+      if (!fs.existsSync(file)) {
+        file = path.join(templatePath, `application.gjs`);
+      }
+      if (fs.existsSync(applicationFile)) {
+        this.ui.writeLine(`Added wormhole statement to ${applicationFile}`);
+        promises.push(
+          this.insertIntoFile(applicationFile, `import BasicDropdownWormhole from 'ember-basic-dropdown/components/basic-dropdown-wormhole';${EOL}`, {
+            before: `<template>`,
+          }),
+        );
+        promises.push(
+          this.insertIntoFile(applicationFile, `${EOL} <BasicDropdownWormhole />`, {
+            after: `<template>`,
+          }),
+        );
+      }
     }
 
     return Promise.all(promises);