REFACTOR: Support bundling our admin section as an ember addon

app/assets/javascripts/admin/addon/mixins/setting-object.js

@@ -0,0 +1,69 @@
+import I18n from "I18n";
+import discourseComputed from "discourse-common/utils/decorators";
+import { computed } from "@ember/object";
+import Mixin from "@ember/object/mixin";
+import { isPresent } from "@ember/utils";
+
+export default Mixin.create({
+  @discourseComputed("value", "default")
+  overridden(val, defaultVal) {
+    if (val === null) {
+      val = "";
+    }
+    if (defaultVal === null) {
+      defaultVal = "";
+    }
+
+    return val.toString() !== defaultVal.toString();
+  },
+
+  computedValueProperty: computed(
+    "valueProperty",
+    "validValues.[]",
+    function () {
+      if (isPresent(this.valueProperty)) {
+        return this.valueProperty;
+      }
+
+      if (isPresent(this.validValues.get("firstObject.value"))) {
+        return "value";
+      } else {
+        return null;
+      }
+    }
+  ),
+
+  computedNameProperty: computed("nameProperty", "validValues.[]", function () {
+    if (isPresent(this.nameProperty)) {
+      return this.nameProperty;
+    }
+
+    if (isPresent(this.validValues.get("firstObject.name"))) {
+      return "name";
+    } else {
+      return null;
+    }
+  }),
+
+  @discourseComputed("valid_values")
+  validValues(validValues) {
+    const vals = [],
+      translateNames = this.translate_names;
+
+    validValues.forEach((v) => {
+      if (v.name && v.name.length > 0 && translateNames) {
+        vals.addObject({ name: I18n.t(v.name), value: v.value });
+      } else {
+        vals.addObject(v);
+      }
+    });
+    return vals;
+  },
+
+  @discourseComputed("valid_values")
+  allowsNone(validValues) {
+    if (validValues && validValues.indexOf("") >= 0) {
+      return "admin.settings.none";
+    }
+  },
+});