Create directory listing tree in python and output in JSON

dirlist_creator.py

import os
import json

def path_to_dict(path):
    d = {'name': os.path.basename(path)}
    if os.path.isdir(path):
        d['type'] = "directory"
        d['children'] = [path_to_dict(os.path.join(path,x)) for x in os.listdir\
(path)]
    else:
        d['type'] = "file"
    return d

print json.dumps(path_to_dict('.'))

# Output like below
# From https://stackoverflow.com/questions/25226208/represent-directory-tree-as-json
"""
{
  "type": "directory",
  "name": "hello",
  "children": [
    {
      "type": "directory",
      "name": "world",
      "children": [
        {
          "type": "file",
          "name": "one.txt"
        },
        {
          "type": "file",
          "name": "two.txt"
        }
      ]
    },
    {
      "type": "file",
      "name": "README"
    }
  ]
}
"""

#!python3

import os
import json

def path_to_dict(path):
    d = {os.path.basename(path): {}}
    if os.path.isdir(path):
        d[os.path.basename(path)]['type'] = "directory"
        d[os.path.basename(path)]['children'] = [path_to_dict(os.path.join(path,x)) for x in os.listdir(path)]
    else:
        d[os.path.basename(path)]['type'] = "file"
    return d

with open('MANIFEST.JSON', 'w', encoding='utf-8') as f:
    json.dump(path_to_dict('.'), f, ensure_ascii=False, indent=4)

So I've modified it to this point. However, my goal is to represent the children as one single object with each child being a key of that single object. However, I don't know an equivalent to the list comprehension here: [path_to_dict(os.path.join(path,x)) for x in os.listdir(path)]

It gives output like this:

{
    ".": {
        "type": "directory",
        "children": [
            {
                "css": {
                    "type": "directory",
                    "children": [
                        {
                            "index.css": {
                                "type": "file"
                            }
                        }
                    ]
                }
            },
            {
                "desktop.ini": {
                    "type": "file"
                }
            },
            {
                "dir2json.py": {
                    "type": "file"
                }
            },

and so on.
However, with this current structure, to access the files in JavaScript, I'd have to do something like filesObj["."]["css"]["children"][0]["index.css"] which is not pretty. That index right there can really mess me up because it would have me to expect to know the name of the file behind an index. filesObj["."]["css"]["children"]["index.css"] would be better in this case but I'm really struggling how to make children a subobject.

EDIT:
I solved it but probably not the correct way. However, the end result was how I wanted it. Apologies if this is incorrect. I just converted the array of dicts into a single dict.

#!python3

import os
import json

def path_to_dict(path):
    d = {os.path.basename(path): {}}
    if os.path.isdir(path):
        d[os.path.basename(path)]['type'] = "directory"
        d[os.path.basename(path)]['children'] = dict((key,d[key]) for d in [path_to_dict(os.path.join(path,x)) for x in os.listdir(path)] for key in d)
    else:
        d[os.path.basename(path)]['type'] = "file"
    return d

with open('MANIFEST.JSON', 'w', encoding='utf-8') as f:
    json.dump(path_to_dict('.'), f, ensure_ascii=False, indent=4)

outputs:

{
    ".": {
        "type": "directory",
        "children": {
            "css": {
                "type": "directory",
                "children": {
                    "index.css": {
                        "type": "file"
                    }
                }
            },
            "desktop.ini": {
                "type": "file"
            },
            "dir2json.py": {
                "type": "file"
            },

and so on