routie dev init since i didn't adhere to any proper guidance up until now

frontend/node_modules/eslint-plugin-perfectionist/dist/utils/get-options-with-clean-groups.js

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+/**
+ * Cleans and normalizes the groups configuration in options.
+ *
+ * Performs the following optimizations on the groups array:
+ *
+ * - Removes empty arrays (they serve no purpose in grouping)
+ * - Converts single-element arrays to plain strings (simplifies structure)
+ * - Preserves multi-element arrays as-is (maintains subgroups).
+ *
+ * This normalization ensures consistent group handling and eliminates
+ * unnecessary complexity in the configuration.
+ *
+ * @example
+ *
+ * ```ts
+ * getOptionsWithCleanGroups({
+ *   groups: [
+ *     'imports',
+ *     ['types'], // Single element - will become 'types'
+ *     ['hooks', 'utils'], // Multiple elements - preserved as array
+ *     [], // Empty - will be removed
+ *     'components',
+ *   ],
+ * })
+ * // Returns: {
+ * //   groups: [
+ * //     'imports',
+ * //     'types',
+ * //     ['hooks', 'utils'],
+ * //     'components'
+ * //   ]
+ * // }
+ * ```
+ *
+ * @template CustomTypeOption - Custom type option string for GroupsOptions.
+ * @template Options - Type of options extending
+ *   GetOptionsWithCleanGroupsParameters.
+ * @param options - Options object containing groups to clean.
+ * @returns Options with cleaned and normalized groups array.
+ */
+function getOptionsWithCleanGroups(options) {
+  return {
+    ...options,
+    groups: options.groups
+      .filter(group => !Array.isArray(group) || group.length > 0)
+      .map(group =>
+        Array.isArray(group) ? getCleanedNestedGroups(group) : group,
+      ),
+  }
+}
+/**
+ * Simplifies a nested group array by converting single-element arrays to
+ * strings.
+ *
+ * Helper function that normalizes array groups:
+ *
+ * - Single-element arrays are unwrapped to plain strings
+ * - Multi-element arrays are preserved as-is
+ * - Empty single-element arrays remain as arrays.
+ *
+ * @example
+ *
+ * ```ts
+ * getCleanedNestedGroups(['types']) // Returns: 'types'
+ * getCleanedNestedGroups(['a', 'b']) // Returns: ['a', 'b']
+ * getCleanedNestedGroups(['']) // Returns: ['']
+ * ```
+ *
+ * @param nestedGroup - Array of group names to potentially simplify.
+ * @returns Simplified string if single non-empty element, otherwise the
+ *   original array.
+ */
+function getCleanedNestedGroups(nestedGroup) {
+  return nestedGroup.length === 1 && nestedGroup[0] ?
+      nestedGroup[0]
+    : nestedGroup
+}
+export { getOptionsWithCleanGroups }