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src/lib/app-error.ts

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+import type { AppCommandError } from "@/lib/types"
+
+type ObjectLike = Record<string, unknown>
+
+function asObject(value: unknown): ObjectLike | null {
+  return value !== null && typeof value === "object"
+    ? (value as ObjectLike)
+    : null
+}
+
+function normalizeString(value: unknown): string | null {
+  return typeof value === "string" && value.trim() ? value.trim() : null
+}
+
+function parseErrorObject(value: unknown): AppCommandError | null {
+  const obj = asObject(value)
+  if (!obj) return null
+
+  const code = normalizeString(obj.code)
+  const message = normalizeString(obj.message)
+  const detailRaw = normalizeString(obj.detail)
+  const detail = detailRaw ?? null
+
+  if (!code || !message) return null
+
+  return {
+    code,
+    message,
+    detail,
+  }
+}
+
+export function extractAppCommandError(error: unknown): AppCommandError | null {
+  const direct = parseErrorObject(error)
+  if (direct) return direct
+
+  const errorObject = asObject(error)
+  const message = normalizeString(errorObject?.message)
+  if (!message) return null
+
+  try {
+    const parsed = JSON.parse(message)
+    return parseErrorObject(parsed)
+  } catch {
+    return null
+  }
+}
+
+export function toErrorMessage(error: unknown): string {
+  const appError = extractAppCommandError(error)
+  if (appError) {
+    return appError.detail?.trim() || appError.message
+  }
+
+  if (error instanceof Error) {
+    return error.message.trim()
+  }
+
+  if (typeof error === "string") {
+    return error.trim()
+  }
+
+  try {
+    const serialized = JSON.stringify(error)
+    return serialized ? serialized.trim() : String(error)
+  } catch {
+    return String(error)
+  }
+}