feat(node): support Response static methods

Author: pi0

src/_node-compat/response.ts

@@ -10,6 +10,10 @@ export type NodeResponse = InstanceType<typeof NodeResponse>;
  * It is faster because in most cases it doesn't create a full Response instance.
  */
 export const NodeResponse = /* @__PURE__ */ (() => {
+  const CONTENT_TYPE = "content-type";
+  const JSON_TYPE = "application/json";
+  const JSON_HEADER = [[CONTENT_TYPE, JSON_TYPE]] as HeadersInit;
+
   const _Response = class Response implements globalThis.Response {
     #body?: BodyInit | null;
     #init?: ResponseInit;
@@ -19,6 +23,30 @@ export const NodeResponse = /* @__PURE__ */ (() => {
       this.#init = init;
     }
 
+    static json(data: any, init?: ResponseInit): globalThis.Response {
+      if (init?.headers) {
+        if (!(init.headers as Record<string, string>)[CONTENT_TYPE]) {
+          const initHeaders = new Headers(init.headers);
+          if (!initHeaders.has(CONTENT_TYPE)) {
+            initHeaders.set(CONTENT_TYPE, JSON_TYPE);
+          }
+          init = { ...init, headers: initHeaders };
+        }
+      } else {
+        init = init ? { ...init } : {};
+        init.headers = JSON_HEADER;
+      }
+      return new _Response(JSON.stringify(data), init);
+    }
+
+    static error(): globalThis.Response {
+      return globalThis.Response.error();
+    }
+
+    static redirect(url: string | URL, status?: number): globalThis.Response {
+      return globalThis.Response.redirect(url, status);
+    }
+
     /**
      * Prepare Node.js response object
      */

src/adapters/node.ts

@@ -13,11 +13,12 @@ import { fmtURL, resolvePort, resolveTLSOptions } from "../_utils.ts";
 import { wrapFetch } from "../_plugin.ts";
 
 export {
-  NodeRequest,
   NodeRequest as Request,
+  NodeResponse as Response,
+  NodeRequest,
+  NodeResponse,
   NodeRequestHeaders,
   NodeResponseHeaders,
-  NodeResponse,
 } from "../_node-compat/index.ts";
 
 export function serve(options: ServerOptions): Server {

test/_fixture.ts

@@ -45,11 +45,11 @@ export const server = serve({
         for (const [key, value] of req.headers) {
           resHeaders.append(`x-req-${key}`, value);
         }
-        return new Response(
-          JSON.stringify({
+        return Response.json(
+          {
             ...Object.fromEntries(req.headers.entries()),
             unsetHeader: req.headers.get("" + Math.random()), // #44
-          }),
+          },
           {
             headers: resHeaders,
           },

test/_tests.ts

@@ -32,6 +32,7 @@ export function addTests(
       bar: "baz",
       unsetHeader: null,
     });
+    expect(response.headers.get("content-type")).toMatch(/^application\/json/);
     expect(response.headers.get("x-req-foo")).toBe("bar");
     expect(response.headers.get("x-req-bar")).toBe("baz");
   });