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src/utils/file-detector.ts

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+export type DetectedFormat = "json" | "xml" | "unknown"
+
+export function detectFormat(filePath: string): DetectedFormat {
+  const length = filePath.length
+  const jsonSuffix = length >= 5 ? filePath.substr(length - 5) : ""
+  const xmlSuffix = length >= 4 ? filePath.substr(length - 4) : ""
+  if (jsonSuffix === ".json" || jsonSuffix === ".JSON") return "json"
+  if (xmlSuffix === ".xml" || xmlSuffix === ".XML") return "xml"
+  return "unknown"
+}