".js is not present in the asset pipeline" - ruby-on-rails

Question

I know this is a very repeated question but I have done everything by the books, read a bunch of SO posts and none have helped so far.......
assets.rb
Rails.application.config.assets.version = '1.0'
Rails.application.config.assets.paths << Rails.root.join('node_modules')
application.js:
//= require rails-ujs
//= require activestorage
//= require jquery3
//= require popper
//= require bootstrap-sprockets
//= require turbolinks
//= require_tree .
production.rb:
...
config.assets.js_compressor = Uglifier.new(harmony: true)
config.assets.compile = false
...
gems ( i assume can possible affect this):
gem 'webpacker'
gem 'react-rails'
gem 'bootstrap', '~> 4.3.1'
gem 'jquery-rails'
gem 'sass-rails', '~> 5.0'
gem 'uglifier', '>= 1.3.0'
gem 'coffee-rails', '~> 4.2'
gem 'turbolinks', '~> 5'
gem 'jbuilder', '~> 2.5'
application.rb:
require_relative 'boot'
require 'csv'
require 'rails/all'
# Require the gems listed in Gemfile, including any gems
# you've limited to :test, :development, or :production.
Bundler.require(*Rails.groups)
module Shopify14
class Application < Rails::Application
# Initialize configuration defaults for originally generated Rails version.
config.load_defaults 5.2
config.serve_static_assets = true
# config.active_job.queue_adapter = :sidekiq
# Settings in config/environments/* take precedence over those specified here.
# Application configuration can go into files in config/initializers
# -- all .rb files in that directory are automatically loaded after loading
# the framework and any gems in your application.
end
end
I tried adding application.js to the assets.rb file. (Even though it's already included), but that didn't work.
None of my app/assets/javascript/{} files will work with:
<%= javascript_include_tag "javascript.js" %> without the asset pipeline error message in the console.
I am using heroku
Is there something I am missing?
I would rather not directly add these files to the assets.rb file because these are mostly page specific js files i want to use.