feat(context): export the Context class publicly

[BlankParticle]

The author should do the following, if applicable

• Add tests
• Run tests
• bun run format:fix && bun run lint:fix to format the code
• Add TSDoc/JSDoc to document the code

Motivation

While writing a rpc method on a Durable Obeject, I wanted to return a SSE stream, so I reached for the streamSSE api from hono/streaming, but it turned out I needed to provide in a context, constructing a Context from request is easy, just the issue is that Context is not exported as a accessible class

I managed to work around it with this immediately invoked hono router setup

import { streamSSE } from "hono/streaming";
import { DurableObject } from "cloudflare:workers";
import { Hono } from "hono";

export class SSEStreamer extends DurableObject {
  async stream() {
    return new Hono()
      .get("*", (c) => {
        return streamSSE(c, async (api) => {
          await api.writeSSE({
            event: "message",
            data: "Begin!",
          });
          for (let i = 0; i < 10; i++) {
            await api.writeSSE({
              event: "message",
              data: `tick ${i}`,
            });
            await new Promise((resolve) => setTimeout(resolve, 500));
          }
          await api.writeSSE({
            event: "message",
            data: "End!",
          });
          await api.close();
        });
      })
      .fetch(new Request("http://internal"));
  }
}

export default {
  async fetch(request: Request, env: Env, ctx: ExecutionContext) {
    const stub = env.SSE.getByName("test");
    const res = await stub.stream();
    return res;
  },
} satisfies ExportedHandler<Env>;

But this would be lot easier with the class, just creating the context as needed

const c = new Context(request, {/* */})

this opens up the bridge to use hono helpers like streaming, proxy, cookie utils with normal web standard requests without having to construct a full hono router

// example of using cookie utils in a fetch method
 fetch(request: Request): Response | Promise<Response> {
   const c = new Context(request);
   setCookie(c, "test", "test-cookie");
   return c.json({ message: "Hello, world!" });
 }

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 91.52%. Comparing base (342ff3b) to head (3cd84a5).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4543   +/-   ##
=======================================
  Coverage   91.52%   91.52%           
=======================================
  Files         172      172           
  Lines       11221    11222    +1     
  Branches     3255     3257    +2     
=======================================
+ Hits        10270    10271    +1     
  Misses        950      950           
  Partials        1        1           

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