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

frontend/node_modules/eslint-plugin-perfectionist/dist/utils/get-settings.js

@@ -0,0 +1,72 @@
+/**
+ * Extracts and validates Perfectionist settings from ESLint configuration.
+ *
+ * Retrieves global Perfectionist settings that apply to all rules. Validates
+ * that only allowed settings are provided and throws an error if invalid
+ * options are detected. This ensures configuration errors are caught early with
+ * clear error messages.
+ *
+ * The settings are accessed from the 'perfectionist' key in ESLint's shared
+ * configuration settings.
+ *
+ * @example
+ *
+ * ```ts
+ * // Valid usage:
+ * const settings = getSettings(context.settings)
+ * // Returns: { type: 'natural', order: 'asc', ignoreCase: true }
+ * ```
+ *
+ * @example
+ *
+ * ```ts
+ * // Invalid setting throws error:
+ * getSettings({
+ *   perfectionist: {
+ *     type: 'natural',
+ *     invalidOption: true, // This will throw
+ *   },
+ * })
+ * // Throws: Error: Invalid Perfectionist setting(s): invalidOption
+ * ```
+ *
+ * @param settings - ESLint shared configuration settings object.
+ * @returns Validated Perfectionist settings or empty object if none configured.
+ * @throws {Error} If invalid settings are provided.
+ */
+function getSettings(settings) {
+  if (!settings['perfectionist']) {
+    return {}
+  }
+  /**
+   * Identifies settings keys that are not in the allowed list.
+   *
+   * @param object - Settings object to validate.
+   * @returns Array of invalid setting names.
+   */
+  function getInvalidOptions(object) {
+    let allowedOptions = new Set([
+      'partitionByComment',
+      'partitionByNewLine',
+      'specialCharacters',
+      'newlinesBetween',
+      'newlinesInside',
+      'fallbackSort',
+      'ignoreCase',
+      'alphabet',
+      'locales',
+      'order',
+      'type',
+    ])
+    return Object.keys(object).filter(key => !allowedOptions.has(key))
+  }
+  let perfectionistSettings = settings['perfectionist']
+  let invalidOptions = getInvalidOptions(perfectionistSettings)
+  if (invalidOptions.length > 0) {
+    throw new Error(
+      `Invalid Perfectionist setting(s): ${invalidOptions.join(', ')}`,
+    )
+  }
+  return settings['perfectionist']
+}
+export { getSettings }