fix: cannot send multiple files

src/util/clone.ts

@@ -1,14 +1,17 @@
+/* eslint-disable @typescript-eslint/no-unsafe-return */
 import { isBlob } from './is'
 import deepClone from 'clone'
 import fromEntries from 'object.fromentries'
 
 
 export function clone<T>(obj: T): T {
-  if (typeof obj === 'object' && !Array.isArray(obj)) {
+  if (Array.isArray(obj)) {
+    return obj.map(item => isBlob(item) ? item : clone(item)) as unknown as T
+  } else if (typeof obj === 'object' && !Array.isArray(obj)) {
     const entries = Object.entries(obj)
       .map(([key, value]): [string, any] => ([
         key,
-        isBlob(value) ? value : deepClone(value),
+        isBlob(value) ? value : clone(value),
       ]))
 
     return fromEntries(entries) as T

tests/integration/request-body.ts

@@ -31,6 +31,7 @@ test.only('Form-Data Request', async t => {
     .field('key2', 'value2')
     .send(formData)
     .attach('file1', file)
+    .attach('file1', file, 'file1.txt')
     .attach('file2', file, 'file2.txt')
     .option('fetchAPI', fetchAPI)
 
@@ -50,9 +51,9 @@ test.only('Form-Data Request', async t => {
   t.is(result.get('key2'), 'value2')
   t.is(result.get('key3'), 'value3')
 
-  const file1 = result.get('file1') as File
-  t.is(file1.name, 'blob')
-  t.is(await file1.text(), 'file')
+  const file1 = result.getAll('file1') as File[]
+  t.is(file1[0].name, 'blob')
+  t.is(await file1[0].text(), 'file')
 
   const file2 = result.get('file2') as File
   t.is(file2.name, 'file2.txt')