diff --git a/src/fetcher.ts b/src/fetcher.ts
index 7c87144..cad2694 100644
--- a/src/fetcher.ts
+++ b/src/fetcher.ts
@@ -1,6 +1,6 @@
-import type { Options, NoUndefined } from './types'
+import type { Options } from './types'
 
-export const fetcher: NoUndefined<Options['fetcher']> = url => {
+export const fetcher: Required<Options>['fetcher'] = url => {
   return new Promise(async resolve => {
     try {
       const response = await fetch(url)
diff --git a/src/types.ts b/src/types.ts
index 1a28bcc..1e58b7a 100644
--- a/src/types.ts
+++ b/src/types.ts
@@ -1,4 +1,3 @@
-export type NoUndefined<T> = T extends undefined ? never : T
 export type Thenable<T> = Promise<T> | T
 export type Hook = (value: string) => Thenable<string | void>
 export type BuildSvgDataURI = (html: Node, options: Options) => Promise<string>