Merge pull request #319 from NullVoxPopuli-ai-agent/fix/compat-build-classic-ember-support

Enable classicEmberSupport() for compat-build scenarios

Author: NullVoxPopuli

test-app/.try.mjs

@@ -1,6 +1,6 @@
 // When building your addon for older Ember versions you need to have the required files
 const compatFiles = {
-  'ember-cli-build.js': `const EmberApp = require('ember-cli/lib/broccoli/ember-app');
+  'ember-cli-build.cjs': `const EmberApp = require('ember-cli/lib/broccoli/ember-app');
 const { compatBuild } = require('@embroider/compat');
 module.exports = async function (defaults) {
   const { buildOnce } = await import('@embroider/vite');

test-app/vite.config.mjs

@@ -1,10 +1,10 @@
 import { defineConfig } from 'vite';
-import { extensions, ember, hbs } from '@embroider/vite';
+import { extensions, ember, hbs, classicEmberSupport } from '@embroider/vite';
 import { babel } from '@rollup/plugin-babel';
 
 export default defineConfig({
   plugins: [
-    hbs(),
+    ...(process.env.ENABLE_COMPAT_BUILD ? [classicEmberSupport()] : [hbs()]),
     ember(),
     babel({
       babelHelpers: 'runtime',