postinstall/test/fixtures/dep-dep-file/package.json

Deploy files from modules after npm install

{
  "name": "dep-dep-file",
  "scripts": {
    "postinstall": "postinstall"
  },
  "postinstall": {
    "dep-file/test.js": "link second/test.js"
  },
  "dependencies": {
    "postinstall": "../../../",
    "dep-file": "file:../dep-file"
  }
}