Entry always resolves to "browser" field in mono repo (SSR)

[egoist]

• Read the docs.
• Use Vite >=2.0. (1.x is no longer supported)
• If the issue is related to 1.x -> 2.0 upgrade, read the Migration Guide first.

Describe the bug

In SSR, if pkg browser field or alternative (like exports.browser) is present, it's always used as pkg entry.

This only happens in mono repos, packages installed in node_modules are correctly resolved.

Reproduction

Create a package in Vite monorepo itself:

packages/foo/node.js:

console.log('node')

packages/foo/browser.js:

console.log('browser')

packages/foo/package.json:

{
  "name": "foo",
  "version": "0.0.0",
  "main": "node.js",
  "browser": "browser.js"
}

And import the package in packages/playground/ssr-vue/src/main.js:

import 'foo'

Run yarn workspace test-ssr-vue dev, it always prints browser.

System Info

• vite version: 2.0.0-beta.65 main branch (185a727715db4a)
• Operating System:
• Node version:
• Package manager (npm/yarn/pnpm) and version:

[yyx990803]

fixed via 92934d4