Response

export type NextCallback = () => Promise<void>; // continue middleware chain

export type HttpBaseResponse = Response | Promise<Response>;

export type Ctx<T extends Record<string, any> = {}, Path extends string = any> =
  Context<T, Path> & T & Record<string, any>;

export type Callback<T = {}, Path extends string = any> =
  (ctx: Ctx<T, Path>) => HttpBaseResponse;

export type Middleware<T = {}, Path extends string = any> =
  (ctx: Ctx<T, Path>, next: NextCallback) =>
    HttpBaseResponse | Promise<HttpBaseResponse | void> | NextCallback;

export type ErrorHandler<T = {}> =
  (err: Error, ctx: Ctx<T>) => HttpBaseResponse;

app.get("/data", (ctx) => {
  ctx.setHeader("Content-Type", "text/plain" )
  return new Response("Hello World", {
    status: 200,
    headers: ctx.header(),
  });
});

app.get("/json", (ctx) => ctx.json({ success: true }, 200));

app.get("/html", (ctx) => ctx.html("<h1>Welcome</h1>"));

app.get("/plain", (ctx) => ctx.text("Just text"));

app.get("/go", (ctx) => ctx.redirect("https://example.com"));

// Serve normally
app.get("/banner", (ctx) => ctx.sendFile("/assets/banner.jpg"));

// Download with custom filename
app.get("/manual", (ctx) =>
  ctx.sendFile("/assets/manual.pdf", { filename: "guide.pdf" })
);

// Force download as binary
app.get("/raw", (ctx) =>
  ctx.sendFile("/data/archive.zip", { download: true })
);