diff --git a/src/file-reference.ts b/src/file-reference.ts
index 8507d48..008d59d 100644
--- a/src/file-reference.ts
+++ b/src/file-reference.ts
@@ -1,3 +1,4 @@
+import { pathExists } from "fs-extra/esm";
 import { join, parse, type ParsedPath } from "node:path";
 
 export class FileReference {
@@ -23,6 +24,10 @@ export class FileReference {
     this.subDir = subDir;
   }
 
+  exists(): Promise<boolean> {
+    return pathExists(this.path());
+  }
+
   parse(): ParsedPath {
     return parse(this.path());
   }
diff --git a/src/generator.ts b/src/generator.ts
index bb7764a..c6dc836 100644
--- a/src/generator.ts
+++ b/src/generator.ts
@@ -39,8 +39,15 @@ type GeneratorArg = {
   type: "boolean" | "positional" | "string";
 };
 
-type ModifyTargetFile = (targetFile: FileReference, args: Args) => void;
-type ModifyTemplateFile = (templateFile: FileReference, args: Args) => void;
+type ModifyTargetFile = (
+  targetFile: FileReference,
+  args: Args,
+) => Promise<void> | void;
+
+type ModifyTemplateFile = (
+  templateFile: FileReference,
+  args: Args,
+) => Promise<void> | void;
 
 // eslint-disable-next-line @typescript-eslint/no-explicit-any
 type Args = Record<string, any>;
@@ -88,16 +95,16 @@ export function defineGenerator({
       subDir: generatorName,
     });
 
-    modifyTargetFile?.(targetFile, resolvedArgs);
-    modifyTemplateFile?.(templateFile, resolvedArgs);
+    await modifyTargetFile?.(targetFile, resolvedArgs);
+    await modifyTemplateFile?.(templateFile, resolvedArgs);
 
     if (targetFile.subDir === "") {
       targetFile.subDir = join(getSrcDir(packageJson), generatorName + "s");
     }
 
     for (const arg of generatorArgs) {
-      arg.modifyTargetFile?.(targetFile, resolvedArgs);
-      arg.modifyTemplateFile?.(templateFile, resolvedArgs);
+      await arg.modifyTargetFile?.(targetFile, resolvedArgs);
+      await arg.modifyTemplateFile?.(templateFile, resolvedArgs);
     }
 
     const templateContent = await readFile(templateFile.path(), "utf-8");
@@ -289,8 +296,16 @@ export function typescript({
     modifyTargetFile: (targetFile, args): void => {
       targetFile.ext = args.typescript ? tsExt : jsExt;
     },
-    modifyTemplateFile: (templateFile, args): void => {
-      templateFile.ext = args.typescript ? tsExt : jsExt;
+    modifyTemplateFile: async (templateFile, args): Promise<void> => {
+      if (args.typescript) {
+        templateFile.ext = tsExt;
+
+        if ((await templateFile.exists()) === false) {
+          templateFile.ext = jsExt;
+        }
+      } else {
+        templateFile.ext = jsExt;
+      }
     },
     name: "typescript",
     type: "boolean",
diff --git a/templates/acceptance-test/acceptance-test.ts b/templates/acceptance-test/acceptance-test.ts
deleted file mode 100644
index ea12390..0000000
--- a/templates/acceptance-test/acceptance-test.ts
+++ /dev/null
@@ -1,13 +0,0 @@
-import { currentURL, visit } from '@ember/test-helpers';
-import { module, test } from 'qunit';
-import { setupApplicationTest } from '{{testHelpersImportPath}}';
-
-module('Acceptance | {{name.path}}', function (hooks) {
-  setupApplicationTest(hooks);
-
-  test('it visits /{{name.path}}', async function (assert) {
-    await visit('/{{name.path}}');
-
-    assert.strictEqual(currentURL(), '/{{name.path}}');
-  });
-});
diff --git a/templates/component-test/component-test.gts b/templates/component-test/component-test.gts
deleted file mode 100644
index 6b6f8af..0000000
--- a/templates/component-test/component-test.gts
+++ /dev/null
@@ -1,24 +0,0 @@
-import { render } from '@ember/test-helpers';
-import { module, test } from 'qunit';
-import {{name.pascal}} from '{{package.name}}/components/{{name.path}}';
-import { setupRenderingTest } from '{{testHelpersImportPath}}';
-
-module('Integration | Component | {{name.pascal}}', function (hooks) {
-  setupRenderingTest(hooks);
-
-  test('it renders', async function (assert) {
-    await render(<template><{{name.pascal}} /></template>);
-
-    assert.dom().hasText('');
-
-    await render(
-      <template>
-        <{{name.pascal}}>
-          template block text
-        </{{name.pascal}}>
-      </template>
-    );
-
-    assert.dom().hasText('template block text');
-  });
-});
diff --git a/templates/helper-test/helper-test.gts b/templates/helper-test/helper-test.gts
deleted file mode 100644
index f1c362c..0000000
--- a/templates/helper-test/helper-test.gts
+++ /dev/null
@@ -1,15 +0,0 @@
-import { render } from '@ember/test-helpers';
-import { module, test } from 'qunit';
-import { setupRenderingTest } from '{{testHelpersImportPath}}';
-
-module('Integration | Helper | {{name.camel}}', function (hooks) {
-  setupRenderingTest(hooks);
-
-  test('it renders', async function (assert) {
-    const inputValue = '1234';
-
-    await render(<template>\{{{{name.camel}} inputValue}}</template>);
-
-    assert.dom().hasText('1234');
-  });
-});
diff --git a/templates/helper/helper.function-based.ts b/templates/helper/helper.function-based.ts
deleted file mode 100644
index 477d464..0000000
--- a/templates/helper/helper.function-based.ts
+++ /dev/null
@@ -1,3 +0,0 @@
-export default function {{name.camel}}(positional, named) {
-  return positional;
-}
diff --git a/templates/modifier-test/modifier-test.gts b/templates/modifier-test/modifier-test.gts
deleted file mode 100644
index 676357f..0000000
--- a/templates/modifier-test/modifier-test.gts
+++ /dev/null
@@ -1,13 +0,0 @@
-import { render } from '@ember/test-helpers';
-import { module, test } from 'qunit';
-import { setupRenderingTest } from '{{testHelpersImportPath}}';
-
-module('Integration | Modifier | {{name.camel}}', function (hooks) {
-  setupRenderingTest(hooks);
-
-  test('it renders', async function (assert) {
-    await render(<template><div \{{{{name.camel}}\}}></div></template>);
-
-    assert.ok(true);
-  });
-});
diff --git a/templates/service-test/service-test.ts b/templates/service-test/service-test.ts
deleted file mode 100644
index a50dc95..0000000
--- a/templates/service-test/service-test.ts
+++ /dev/null
@@ -1,12 +0,0 @@
-import { module, test } from 'qunit';
-import { setupTest } from '{{testHelpersImportPath}}';
-
-module('Unit | Service | {{name.pascal}}', function (hooks) {
-  setupTest(hooks);
-
-  test('it exists', function (assert) {
-    const service = this.owner.lookup('service:{{name.path}}');
-
-    assert.ok(service);
-  });
-});