diff --git a/src/adapter/deno/deno.d.ts b/src/adapter/deno/deno.d.ts
index bebe8e96..38eaf320 100644
--- a/src/adapter/deno/deno.d.ts
+++ b/src/adapter/deno/deno.d.ts
@@ -1,4 +1,28 @@
 declare namespace Deno {
+  interface FileHandleLike {
+    readonly readable: ReadableStream<Uint8Array>
+  }
+
+  /**
+   * Open the file using the specified path.
+   *
+   * @param path The path to open the file.
+   * @returns FileHandle object.
+   */
+  export function open(path: string): Promise<FileHandleLike>
+
+  interface StatsLike {
+    isDirectory: boolean
+  }
+
+  /**
+   * Get stats with the specified path.
+   *
+   * @param path The path to get stats.
+   * @returns Stats object.
+   */
+  export function lstatSync(path: string): StatsLike
+
   /**
    * Creates a new directory with the specified path.
    *
@@ -12,17 +36,44 @@ declare namespace Deno {
    * Write a new file, with the specified path and data.
    *
    * @param path The path to the file to write.
-   * @param data The data to write to the file.
+   * @param data The data to write into the file.
    * @returns A promise that resolves when the file is written.
    */
   export function writeFile(path: string, data: Uint8Array): Promise<void>
 
+  /**
+   * Errors of Deno
+   */
+  export const errors: Record<string, Function>
+
   export function upgradeWebSocket(
     req: Request,
-    // eslint-disable-next-line @typescript-eslint/no-explicit-any
-    options: any
+    options: UpgradeWebSocketOptions
   ): {
     response: Response
     socket: WebSocket
   }
+
+  /**
+   * Options of `upgradeWebSocket`
+   */
+  export interface UpgradeWebSocketOptions {
+    /**
+     * Sets the `.protocol` property on the client-side web socket to the
+     * value provided here, which should be one of the strings specified in the
+     * `protocols` parameter when requesting the web socket. This is intended
+     * for clients and servers to specify sub-protocols to use to communicate to
+     * each other.
+     */
+    protocol?: string
+    /**
+     * If the client does not respond to this frame with a
+     * `pong` within the timeout specified, the connection is deemed
+     * unhealthy and is closed. The `close` and `error` events will be emitted.
+     *
+     * The unit is seconds, with a default of 30.
+     * Set to `0` to disable timeouts.
+     */
+    idleTimeout?: number
+  }
 }
diff --git a/src/adapter/deno/serve-static.ts b/src/adapter/deno/serve-static.ts
index 0a575dfe..0e28424d 100644
--- a/src/adapter/deno/serve-static.ts
+++ b/src/adapter/deno/serve-static.ts
@@ -2,8 +2,6 @@ import type { ServeStaticOptions } from '../../middleware/serve-static'
 import { serveStatic as baseServeStatic } from '../../middleware/serve-static'
 import type { Env, MiddlewareHandler } from '../../types'
 
-// eslint-disable-next-line @typescript-eslint/ban-ts-comment
-// @ts-ignore
 const { open, lstatSync, errors } = Deno
 
 export const serveStatic = <E extends Env = Env>(
@@ -13,12 +11,12 @@ export const serveStatic = <E extends Env = Env>(
     const getContent = async (path: string) => {
       try {
         const file = await open(path)
-        // eslint-disable-next-line @typescript-eslint/no-explicit-any
-        return file ? (file.readable as any) : null
+        return file.readable
       } catch (e) {
         if (!(e instanceof errors.NotFound)) {
           console.warn(`${e}`)
         }
+        return null
       }
     }
     const pathResolve = (path: string) => {
diff --git a/src/adapter/deno/websocket.ts b/src/adapter/deno/websocket.ts
index a99bf8dd..d50ad7f1 100644
--- a/src/adapter/deno/websocket.ts
+++ b/src/adapter/deno/websocket.ts
@@ -1,27 +1,7 @@
 import type { UpgradeWebSocket, WSReadyState } from '../../helper/websocket'
 import { WSContext, defineWebSocketHelper } from '../../helper/websocket'
 
-export interface UpgradeWebSocketOptions {
-  /**
-   * Sets the `.protocol` property on the client side web socket to the
-   * value provided here, which should be one of the strings specified in the
-   * `protocols` parameter when requesting the web socket. This is intended
-   * for clients and servers to specify sub-protocols to use to communicate to
-   * each other.
-   */
-  protocol?: string
-  /**
-   * If the client does not respond to this frame with a
-   * `pong` within the timeout specified, the connection is deemed
-   * unhealthy and is closed. The `close` and `error` event will be emitted.
-   *
-   * The unit is seconds, with a default of 30.
-   * Set to `0` to disable timeouts.
-   */
-  idleTimeout?: number
-}
-
-export const upgradeWebSocket: UpgradeWebSocket<WebSocket, UpgradeWebSocketOptions> =
+export const upgradeWebSocket: UpgradeWebSocket<WebSocket, Deno.UpgradeWebSocketOptions> =
   defineWebSocketHelper(async (c, events, options) => {
     if (c.req.header('upgrade') !== 'websocket') {
       return