refactor: improve readability of long method

apps/sandbox/src/form/availableInPlatform.ts

@@ -1,5 +1,5 @@
 import {toValue} from 'vue';
-import {useMemoize} from '@vueuse/core';
+import {useMemoize, isDefined} from '@vueuse/core';
 import {
   type ConfigKey,
   useLogger,
@@ -17,6 +17,29 @@ import {getAllSandboxConfigOptions} from './getAllSandboxConfigOptions';
 
 const ALWAYS_ENABLED_FIELDS: readonly string[] = Object.freeze([CarrierSetting.AllowDeliveryOptions]);
 
+const isValidCarrier = (carrierIdentifier?: CarrierIdentifier): carrierIdentifier is CarrierIdentifier => {
+  return isDefined(carrierIdentifier) && isEnumValue(resolveCarrierName(carrierIdentifier), CarrierName);
+};
+
+const featureIsEnabled = (
+  carrierIdentifier: CarrierIdentifier,
+  platformName: SupportedPlatformName,
+  field: ConfigKey,
+): boolean => {
+  const {features} = useCarrier({carrierIdentifier, platformName});
+
+  const isEnabled = toValue(features).has(field);
+
+  if (!isEnabled) {
+    const options = getAllSandboxConfigOptions();
+    const match = options.find((option) => option.key === field);
+
+    return match?.parents?.some((parent) => toValue(features).has(parent)) ?? false;
+  }
+
+  return isEnabled;
+};
+
 export const availableInCarrier = useMemoize((fieldName: string, platformName: SupportedPlatformName): boolean => {
   const logger = useLogger();
 
@@ -35,7 +58,7 @@ export const availableInCarrier = useMemoize((fieldName: string, platformName: S
 
   const carrierIdentifier = split?.[split.indexOf(KEY_CARRIER_SETTINGS) + 1] as CarrierIdentifier | undefined;
 
-  if (!carrierIdentifier || !isEnumValue(resolveCarrierName(carrierIdentifier), CarrierName)) {
+  if (!isValidCarrier(carrierIdentifier)) {
     return true;
   }
 
@@ -45,16 +68,5 @@ export const availableInCarrier = useMemoize((fieldName: string, platformName: S
     return false;
   }
 
-  const {features} = useCarrier({carrierIdentifier, platformName});
-
-  const isEnabled = toValue(features).has(baseField);
-
-  if (!isEnabled) {
-    const options = getAllSandboxConfigOptions();
-    const match = options.find((option) => option.key === baseField);
-
-    return match?.parents?.some((parent) => toValue(features).has(parent)) ?? false;
-  }
-
-  return isEnabled;
+  return featureIsEnabled(carrierIdentifier, platformName, baseField);
 });