allow empty objects for `fields` types (#4631)

packages/@uppy/aws-s3-multipart/types/index.d.ts

@@ -11,7 +11,7 @@ export type AwsS3UploadParameters = {
 } | {
   method?: 'PUT'
   url: string
-  fields?: never
+  fields?: Record<string, never>
   expires?: number
   headers?: Record<string, string>
 }

packages/@uppy/aws-s3/types/index.d.ts

@@ -12,7 +12,7 @@ export type AwsS3UploadParameters = {
 } | {
   method: 'PUT'
   url: string
-  fields?: never
+  fields?: Record<string, never>
   expires?: number
   headers?: Record<string, string>
 }