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

frontend/node_modules/eslint-plugin-perfectionist/dist/utils/get-group-index.d.ts

@@ -0,0 +1,41 @@
+import { GroupsOptions } from '../types/common-groups-options.js'
+import { SortingNode } from '../types/sorting-node.js'
+/**
+ * Type representing a single group or an array of group names. Used in group
+ * configuration where elements can belong to multiple subgroups.
+ */
+type Group = GroupsOptions[number]
+/**
+ * Determines the index of the group that a node belongs to.
+ *
+ * Searches through the groups array to find which group contains the node.
+ * Supports simple groups (string), subgroups (array of strings) and objects
+ * containing a `group` property. For subgroups, the node matches if its group
+ * is any element in the array.
+ *
+ * The function returns the index of the matching group. If no group matches, it
+ * returns the length of the groups array, which conventionally represents the
+ * "unknown" group and ensures such nodes are sorted last.
+ *
+ * @example
+ *
+ * ```ts
+ * const groups = ['imports', ['types', 'interfaces'], 'functions']
+ * const node1 = { group: 'imports', name: 'lodash' }
+ * const node2 = { group: 'types', name: 'User' }
+ * const node3 = { group: 'unknown-group', name: 'misc' }
+ *
+ * getGroupIndex(groups, node1) // Returns: 0
+ * getGroupIndex(groups, node2) // Returns: 1 (matches subgroup)
+ * getGroupIndex(groups, node3) // Returns: 3 (groups.length, unknown group)
+ * ```
+ *
+ * @param groups - Array of group configurations (strings or arrays of strings).
+ * @param node - Sorting node with a group property to match.
+ * @returns Index of the matching group, or groups.length if no match found.
+ */
+export declare function getGroupIndex(
+  groups: Group[],
+  node: SortingNode,
+): number
+export {}