[1.2.15] Nested async plugins mismatch routes to handlers

[goldenstein64]

What version of Elysia is running?

1.2.15

What platform is your computer?

Microsoft Windows NT 10.0.26100.0 x64

What steps can reproduce the bug?

Run this test:

import { it, expect } from "bun:test";
import { Elysia } from "elysia";

const asyncPlugin = Promise.resolve(new Elysia({ name: "AsyncPlugin" }));

const plugin = new Elysia({ name: "Plugin" })
  .use(asyncPlugin)
  .get("/plugin", () => "GET /plugin");

const app = new Elysia({ name: "App" })
  .use(plugin)
  .get("/foo", () => "GET /foo")
  .listen(3000);

it("matches the right route", async () => {
  const response = await app.handle(new Request("http://localhost/plugin"));
  const text = await response.text();
  expect(text).toEqual("GET /plugin");
});

What is the expected behavior?

The test should pass.

What do you see instead?

The test fails. expect receives GET /foo instead of GET /plugin.

Additional information

This issue was present in 1.2.14, see #1067. It is still present in 1.2.15.

There is a semi-obvious workaround for this, awaiting the async plugin, but that means any plugins using it will have to be async too if they weren't before. Personally, it's not a deal breaker, but it feels unexpected and is not easy to detect.

I stumbled into this bug while using the @elysiajs/swagger package.

Bun version: 1.2.2+c1708ea6a

Have you try removing the node_modules and bun.lockb and try again yet?

Yes