fix(lib): improve error message for passing an app to a construct

packages/cdktf/lib/terraform-stack.ts

@@ -94,15 +94,11 @@ export class TerraformStack extends Construct {
 
       if (!node.scope) {
         let hint = "";
-        if (
-          construct.node.scope === c &&
-          App.isApp(c) &&
-          TerraformBackend.isBackend(construct)
-        ) {
+        if (construct.node.scope === c && App.isApp(c)) {
           // the scope of the originally passed construct equals the construct c
           // which has no scope (i.e. has no parent construct) and c is an App
           // and our construct is a Backend
-          hint = `. You seem to have passed your root App as scope to a TerraformBackend construct. Pass a stack as scope to your backend instead.`;
+          hint = `. You seem to have passed your root App as scope to a construct. Pass a stack (inheriting from TerraformStack) as scope to your construct instead.`;
         }
 
         throw new Error(

packages/cdktf/test/stack.test.ts

@@ -117,12 +117,12 @@ test("stack validation returns no error when provider is not set", () => {
   expect(errors).toEqual([]);
 });
 
-test("getting Stack for TerraformBackend which was added to root app returns friendly error", () => {
+test("getting Stack for construct which was added to root app returns friendly error", () => {
   const app = Testing.stubVersion(new App({ stackTraces: false }));
   new TerraformStack(app, "MyStack");
 
   expect(() => new LocalBackend(app, {})).toThrowErrorMatchingInlineSnapshot(
-    `"No stack could be identified for the construct at path 'backend'. You seem to have passed your root App as scope to a TerraformBackend construct. Pass a stack as scope to your backend instead."`
+    `"No stack could be identified for the construct at path 'backend'. You seem to have passed your root App as scope to a construct. Pass a stack (inheriting from TerraformStack) as scope to your construct instead."`
   );
 });