All files / src/lib/uploads extractErrorMessage.ts

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/**
 * Flatten nested API or task error payloads into a single readable message.
 * Import task errors can arrive as strings, arrays, or nested objects.
 */
export function extractErrorMessage(errorBody: unknown): string | null {
  if (typeof errorBody === "string") {
    return errorBody;
  }
 
  if (Array.isArray(errorBody)) {
    const firstMessage = errorBody.find((value) => typeof value === "string");
    return typeof firstMessage === "string" ? firstMessage : null;
  }
 
  if (!errorBody || typeof errorBody !== "object") {
    return null;
  }
 
  for (const value of Object.values(errorBody as Record<string, unknown>)) {
    const message = extractErrorMessage(value);
    if (message) {
      return message;
    }
  }
 
  return null;
}