fix: correctly resolve client boundary created by server package during dev

[hi-ogawa]

• closes support ai/rsc package #1049

This virtual trick might be a bit of novelty. But I'm not sure if this is guaranteed to work, so let's show a warning for now. (Also we should say such package should be in optimizeDeps.exclude)

4:42:44 PM [vite] (rsc) warning: [vite-rsc] detected an internal client boundary created by a package imported on rsc environment
  Plugin: rsc:use-client
  File: /home/hiroshi/code/personal/vite-plugins/node_modules/.pnpm/@vitejs+test-dep-client-in-server@file+packages+rsc+examples+basic+test-dep+client-in-server_react@19.1.0/node_modules/@vitejs/test-dep-client-in-server/client.js?v=b7fff1c3

todo

• test mini repro
• test ai/rsc
  • manually tested in feat: use Vite RSC API waku#2
    pnpm -C e2e/fixtures/ssr-basic/ exec waku-vite-rsc

[hi-ogawa]

• fix: correctly resolve client boundary created by server package during dev #1050 👈 (View in Graphite)
• main

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[Copilot]

Pull Request Overview

This PR adds a mechanism to detect and proxy “client boundary” imports created by server-only packages in development, emits a warning when they occur, and updates the basic example to exclude those packages and test the behavior.

• Detects ?v= imports without a known package source in dev, warns, and creates a virtual proxy module
• Introduces a new inline plugin rsc:virtual-client-in-server-package to load proxied client modules
• Updates the basic example config, local test dependencies, routes, and adds an E2E test for the client-in-server scenario

Reviewed Changes

Copilot reviewed 13 out of 14 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
packages/rsc/src/plugin.ts	Add detection of unexpected client boundaries, emit warning, and register a virtual proxy plugin for ?v= imports in dev
packages/rsc/examples/basic/vite.config.ts	Recommend excluding client-in-server test packages via optimizeDeps.exclude
packages/rsc/examples/basic/test-dep/client-in-server*	Add local test packages (client-in-server and client-in-server2) simulating server-side imports of client modules
packages/rsc/examples/basic/src/routes/client-in-server/*	Add server and client components to exercise the client-in-server proxy in the example app
packages/rsc/examples/basic/src/routes/root.tsx	Render the new TestClientInServer component in the example app
packages/rsc/examples/basic/package.json	Include the two local test-dep packages
packages/rsc/examples/basic/e2e/basic.test.ts	Add an E2E test for verifying the client-in-server proxy behavior

Files not reviewed (1)

• pnpm-lock.yaml: Language not supported