step 2: remove the post-css process entirely to ease migration to v2 …

…addon

README.md

@@ -200,29 +200,7 @@ custom animations.
 
 ### CSS Variables
 
-⚠️ This functionality will be removed in 5.0.0, checkout the [DEPRECATIONS.md]('https://github.com/mainmatter/ember-promise-modals/blob/main/DEPRECATIONS.md#postcss-process) guide.
-
-The addons CSS is run through PostCSS by default, which will create static
-fallbacks for all custom properties using their defaults.
-
-If your application uses PostCSS by itself, you can set `excludeCSS` to `true`
-inside your `ember-cli-build.js`:
-
-```js
-let app = new EmberAddon(defaults, {
-  // Add options here
-  'ember-promise-modals': {
-    excludeCSS: true,
-  },
-});
-```
-
-Done that, you can use [postcss-import](https://github.com/postcss/postcss-import)
-to import the uncompiled addon styles in your projects `app/styles/app.css`:
-
-```css
-@import 'ember-promise-modals';
-```
+The addons CSS relies on CSS variables and won't work properly on browsers that don't support this feature.
 
 ## Accessibility
 

index.js

@@ -1,45 +1,5 @@
 'use strict';
 
-const funnel = require('broccoli-funnel');
-const mergeTrees = require('broccoli-merge-trees');
-const BroccoliPostCSS = require('broccoli-postcss');
-const postcssPresetEnv = require('postcss-preset-env');
-
-const pkg = require('./package.json');
-
 module.exports = {
   name: require('./package').name,
-
-  treeForAddon() {
-    const tree = this._super(...arguments);
-    const app = this._findHost();
-    const options = typeof app.options === 'object' ? app.options : {};
-    const addonConfig = options[pkg.name] || {};
-
-    const addonWithoutStyles = funnel(tree, {
-      exclude: ['**/*.css'],
-    });
-
-    if (addonConfig.excludeCSS === true) {
-      return addonWithoutStyles;
-    }
-
-    const addonStyles = funnel(tree, {
-      include: ['**/*.css'],
-    });
-
-    const processedStyles = new BroccoliPostCSS(addonStyles, {
-      plugins: [
-        {
-          module: postcssPresetEnv,
-          options: {
-            stage: 3,
-            overrideBrowserslist: app.project._targets.browsers,
-          },
-        },
-      ],
-    });
-
-    return mergeTrees([addonWithoutStyles, processedStyles]);
-  },
 };

package.json

@@ -31,20 +31,16 @@
   "dependencies": {
     "@ember/test-waiters": "^3.0.2",
     "@embroider/util": "^1.7.1",
-    "broccoli-funnel": "^3.0.8",
-    "broccoli-merge-trees": "^4.2.0",
-    "broccoli-postcss": "^6.0.1",
     "ember-auto-import": "^2.4.2",
     "ember-cli-babel": "^7.26.11",
     "ember-cli-htmlbars": "^6.0.1",
-    "focus-trap": "^6.9.3",
-    "postcss-preset-env": "^7.6.0"
+    "focus-trap": "^6.9.3"
   },
   "devDependencies": {
     "@babel/eslint-parser": "7.23.10",
     "@ember/optional-features": "2.0.0",
     "@ember/string": "3.1.1",
-    "@ember/test-helpers": "2.9.4",
+    "@ember/test-helpers": "3.2.1",
     "@embroider/macros": "1.13.4",
     "@embroider/test-setup": "3.0.3",
     "@release-it-plugins/lerna-changelog": "5.0.0",