a.js

var b = require('./b')

module.exports = function () {
  return b(1)
}

b.js

module.exports = function (i) {
  return i + 2
}

deps.json

[{
  "id": "/Users/jhernandez/dev/tests/browserify-playground/b.js",
  "source": "module.exports = function (i) {\n  return i + 2\n}\n",
  "deps":
  {},
  "file": "/Users/jhernandez/dev/tests/browserify-playground/b.js"
},
{
  "id": "/Users/jhernandez/dev/tests/browserify-playground/a.js",
  "source": "var b = require('./b')\n\nmodule.exports = function () {\n  return b(1)\n}\n",
  "deps":
  {
    "./b": "/Users/jhernandez/dev/tests/browserify-playground/b.js"
  },
  "file": "/Users/jhernandez/dev/tests/browserify-playground/a.js"
},
{
  "file": "/Users/jhernandez/dev/tests/browserify-playground/index.js",
  "id": "/Users/jhernandez/dev/tests/browserify-playground/index.js",
  "source": "var a = require('./a')\nvar b = require('./b')\n",
  "deps":
  {
    "./b": "/Users/jhernandez/dev/tests/browserify-playground/b.js",
    "./a": "/Users/jhernandez/dev/tests/browserify-playground/a.js"
  },
  "entry": true
}]

get-deps-json.sh

npm install browserify
module-deps index.js

index.js

var a = require('./a')
var b = require('./b')