Make the argument in isFile and isFormData required

Author: octet-stream

src/util/isFileLike.ts

@@ -30,7 +30,7 @@ import {FileLike} from "../FileLike.js"
  * isFile(createReadStream("path/to/a/file.txt")) // -> false
  * ```
  */
-export const isFile = (value?: unknown): value is FileLike => Boolean(
+export const isFile = (value: unknown): value is FileLike => Boolean(
   (value as FileLike)
     && typeof (value as FileLike) === "object"
     && isFunction((value as FileLike).constructor)

src/util/isFormData.ts

@@ -7,7 +7,7 @@ import {FormDataLike} from "../FormDataLike.js"
  *
  * @param value an object to test
  */
-export const isFormData = (value?: unknown): value is FormDataLike => Boolean(
+export const isFormData = (value: unknown): value is FormDataLike => Boolean(
   (value as FormDataLike)
     && isFunction((value as FormDataLike).constructor)
     && (value as FormDataLike)[Symbol.toStringTag] === "FormData"