gistfile1.txt

$ cat site.pp 
file { '/tmp/foo':
  source => undef,
}

$ puppet master --compile --manifest=site.pp
Compiled catalog for --manifest=site.pp in environment production in 0.02 seconds
{
  "document_type": "Catalog",
  "data": {
    "tags": [
      "settings"
    ],
    "name": "--manifest=site.pp",
    "version": 1360181186,
    "environment": "production",
    "resources": [
      {
        "type": "Stage",
        "title": "main",
        "tags": [
          "stage"
        ],
        "exported": false,
        "parameters": {
          "name": "main"
        }
      },
      {
        "type": "Class",
        "title": "Settings",
        "tags": [
          "class",
          "settings"
        ],
        "exported": false
      },
      {
        "type": "Class",
        "title": "main",
        "tags": [
          "class"
        ],
        "exported": false,
        "parameters": {
          "name": "main"
        }
      },
      {
        "type": "File",
        "title": "/tmp/foo",
        "tags": [
          "file",
          "class"
        ],
        "file": "/home/richardc/apply_test/site.pp",
        "line": 3,
        "exported": false
      }
    ],
    "edges": [
      {
        "source": "Stage[main]",
        "target": "Class[Settings]"
      },
      {
        "source": "Stage[main]",
        "target": "Class[main]"
      },
      {
        "source": "Class[main]",
        "target": "File[/tmp/foo]"
      }
    ],
    "classes": [
      "settings"
    ]
  },
  "metadata": {
    "api_version": 1
  }
}