module Webpacker::Helper

def asset_pack_url(name, **options)

<%= asset_pack_url 'calendar.css' %> # => "http://example.com/packs/calendar-1016838bab065ae1e122.css"
# In production mode:

<%= asset_pack_url 'calendar.css' %> # => nil
# In development mode with hot module replacement:

Example:

This will use asset_url internally, so most of their behaviors will be the same.
Return absolute path using manifest.json and passes it to asset_url helper
Computes the absolute path for a given Webpacker asset. 
def asset_pack_url(name, **options)
  unless Webpacker.dev_server.running? && Webpacker.dev_server.hot_module_replacing?
    asset_url(Webpacker.manifest.lookup!(name), **options)
  end
end