fix(rsc): fix build error when entire client reference module is tree-shaken

[hi-ogawa]

Description

• Closes Build failure in rsc:use-client/build-references #826

We already handle unused client reference exports but not the entire module. This causes entire module to not ended up in rsc environment chunk and cause unexpected undefined. In this case, we can just skip tracking this module on client environment entirely.

For example, this can happen when some use client module is imported through barrel exports, but exports are not used.

// app.js
import { TestServer } from "./lib.js"
console.log(TestServer)

// lib.js
export * from "./lib-server.js";
export * from "./lib-client.js"; // unused

// lib-server.js
export function TestServer() {
  return "test-server"
}

// lib-client.js
"use client"
export function TestClient() {
  return "test-client"
}

TODO

• test

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commit: d575986