drop support for Ember < 4.12

.github/workflows/ci.yml

@@ -57,12 +57,10 @@ jobs:
       fail-fast: false
       matrix:
         try-scenario:
-          - ember-lts-3.28
-          - ember-lts-4.4
+          - ember-lts-4.12
           - ember-release
           - ember-beta
           - ember-canary
-          - ember-classic
           - no-deprecations
           - ember-release-no-deprecations
           - embroider-safe

README.md

@@ -9,8 +9,8 @@ This allows to set custom CSS of an element without requiring a [Content Securit
 
 ## Compatibility
 
-* Ember.js v3.28 or above
-* Ember CLI v3.28 or above
+* Ember.js v4.12 or above
+* Ember CLI v4.12 or above
 * Node.js v18 or above
 
 ## Installation

tests/dummy/config/ember-try.js

@@ -8,18 +8,10 @@ module.exports = async function () {
     useYarn: true,
     scenarios: [
       {
-        name: 'ember-lts-3.28',
+        name: 'ember-lts-4.12',
         npm: {
           devDependencies: {
-            'ember-source': '~3.28.0',
-          },
-        },
-      },
-      {
-        name: 'ember-lts-4.4',
-        npm: {
-          devDependencies: {
-            'ember-source': '~4.4.0',
+            'ember-source': '~4.12.0',
           },
         },
       },
@@ -47,24 +39,6 @@ module.exports = async function () {
           },
         },
       },
-      {
-        name: 'ember-classic',
-        env: {
-          EMBER_OPTIONAL_FEATURES: JSON.stringify({
-            'application-template-wrapper': true,
-            'default-async-observers': false,
-            'template-only-glimmer-components': false,
-          }),
-        },
-        npm: {
-          devDependencies: {
-            'ember-source': '~3.28.0',
-          },
-          ember: {
-            edition: 'classic',
-          },
-        },
-      },
       {
         name: 'no-deprecations',
         npm: {