feat(types.ts): rename types from NextHandler to OptionalHandler

chain.ts

@@ -1,7 +1,7 @@
 // Copyright 2023-latest the httpland authors. All rights reserved. MIT license.
 // This module is browser compatible.
 
-import type { Chainable, ChainableHandler, NextHandler } from "./types.ts";
+import type { Chainable, ChainableHandler, OptionalHandler } from "./types.ts";
 
 /** Immutable chain builder for HTTP handlers.
  *
@@ -123,7 +123,7 @@ export function chain(
 
     if (!first) return response.clone();
 
-    const nextHandler: NextHandler = async (nextRequest = request) =>
+    const nextHandler: OptionalHandler = async (nextRequest = request) =>
       (await run(nextRequest.clone(), response.clone(), ...rest)).clone();
 
     return (await first(request.clone(), nextHandler)).clone();

mod.ts

@@ -2,5 +2,5 @@
 // This module is browser compatible.
 
 export { Chain, chain } from "./chain.ts";
-export type { Chainable, ChainableHandler, NextHandler } from "./types.ts";
+export type { Chainable, ChainableHandler, OptionalHandler } from "./types.ts";
 export type { Handler } from "./deps.ts";

types.ts

@@ -7,13 +7,16 @@ import { type Handler } from "./deps.ts";
  * Accepts `Request` and the next HTTP handlers.
  */
 export interface ChainableHandler {
-  (request: Request, next: NextHandler): Response | Promise<Response>;
+  (
+    request: Request,
+    next: OptionalHandler,
+  ): Response | Promise<Response>;
 }
 
-/** Next HTTP handler.
- * A new `Request` can be passed to the next handler.
+/** Optional `Request` HTTP handler.
+ * It is possible not to pass the `Request` object.
  */
-export interface NextHandler {
+export interface OptionalHandler {
   (request?: Request): Response | Promise<Response>;
 }