vite-node no longer has node_modules as a default for moduleDirectories

[luxaritas]

Describe the bug

I initially noticed that vite-node was not performing esm/cjs interop on third party dependencies, when I expected it to out of the box (and was pretty sure it had previously). Digging into this further, it looks like this is due to #3446 - the moduleDirectories array is initialized to [] in server.ts so that VITE_NODE_DEPS_MODULE_DIRECTORIES can be added to it, however the default of ['/node_modules/'] is not applied until it's used in externalize.ts (and so the fallback codepath is never hit)

Reproduction

https://stackblitz.com/edit/vitest-dev-vitest-5ibjqp

System Info

System:
    OS: Linux 6.4 Manjaro Linux
    CPU: (12) x64 Intel(R) Core(TM) i7-8750H CPU @ 2.20GHz
    Memory: 5.01 GB / 15.27 GB
    Container: Yes
    Shell: 5.1.16 - /bin/bash
  Binaries:
    Node: 18.16.0 - /usr/bin/node
    npm: 9.8.0 - /usr/bin/npm
    pnpm: 7.19.0 - /usr/bin/pnpm
  Browsers:
    Chromium: 115.0.5790.90
  npmPackages:
    vite: ^4.4.4 => 4.4.4 
    vitest: ^0.33.0 => 0.33.0

Used Package Manager

npm

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[stackblitz]

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• vitest-dev-vitest-5ibjqp (Open reproduction)