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

frontend/node_modules/eslint-plugin-perfectionist/dist/utils/create-node-index-map.d.ts

@@ -0,0 +1,30 @@
+import { TSESTree } from '@typescript-eslint/types'
+import { SortingNode } from '../types/sorting-node.js'
+/**
+ * Creates a Map for efficient lookup of node positions in the sorted array.
+ *
+ * Builds an index map that associates each sorting node with its position in
+ * the array. This is used to quickly determine the relative order of nodes
+ * without repeated array searches, improving performance when generating error
+ * messages for incorrectly sorted elements.
+ *
+ * @example
+ *
+ * ```ts
+ * const nodes = [
+ *   { name: 'foo', node: fooNode },
+ *   { name: 'bar', node: barNode },
+ *   { name: 'baz', node: bazNode },
+ * ]
+ * const indexMap = createNodeIndexMap(nodes)
+ * indexMap.get(nodes[0]) // Returns: 0
+ * indexMap.get(nodes[2]) // Returns: 2
+ * ```
+ *
+ * @template Node - Type of the AST node.
+ * @param nodes - Array of sorting nodes in their sorted order.
+ * @returns Map where keys are sorting nodes and values are their indices.
+ */
+export declare function createNodeIndexMap<Node extends TSESTree.Node>(
+  nodes: SortingNode<Node>[],
+): Map<SortingNode, number>