How to get webpack file in django?

Question

I've made a webpack file(as MainPage.js) in output folder which I set up on webpack.config.js However, when I access to my main page it says there is no MainPage.js. What's wrong with it?? (I'm using Django on backend and React on frontend)

Hierarchy of my folder

Cebula4
    -  back
         - settings.py
         - manage.py
    -  front
         - webpack-stats.json
         - webpack.config.js
         - static
             - bundles
                  - MainPage.js (I checked that it was existed)

Settings.py

...

BASE_DIR = "C:\\Users\\1Sun\\Cebula4"

STATIC_URL = '/static/'
STATICFILES_DIRS=[
    os.path.join(BASE_DIR,'static'),
]

STATIC_ROOT=os.path.join(BASE_DIR,'staticfiles')

...

WEBPACK_LOADER = {
    'DEFAULT' : {
            'BUNDLE_DIR_NAME': 'bundles/',
            'STATS_FILE': os.path.join(BASE_DIR, 'front/webpack-stats.json'),

    }
}

...