Adding pre built create-react-app to D8 block

this is my first question here!, so strap on in as this will be good!

I want to know how to add a pre “built” react app to a block, created with `npx create-react-app

reasons are i want to use a LOT of other libraries with in react

what I all-ready do know:

1) how to create custom blocks

2) how to add custom Drupal Js

3) 90% that is google-abe on the subject of react + Drupal.

4) have done the exact thing I am asking many times this in the past,

5) with new version of react cant seem to figure it out.

Steps:

1) created a react app with create-react-app (did not touch anything .. just defaults works see the default sinning logo / done this many many times before)

2) due to reacts new-ish code splitting (https://github.com/facebook/create-react-app/issues/5306)

had to add “react-app-rewired”

suggested in https://www.appnovation.com/blog/using-react-library-drupal

created “config-overrides.js”

with :

module.exports = function override(config, env) { config.optimization.runtimeChunk = false;   config.optimization.splitChunks = {     cacheGroups: {       default: false     }   };   return config; } 

changed package.json file to use app rewind

"scripts": { "start": "react-app-rewired start", "test": "react-scripts test", "eject": "react-scripts eject", "build": "react-app-rewired build && yarn run build:dist", "build:dist": "cd build && cp static/js/*.js main.js && cp static/css/*.css main.css" 

},

NOTE : “cd build && cp static/js/.js main.js && cp static/css/.css main.css”

this is to ensure when working on the react app, can keep the module.libraries.yml the same

somemodule.block.component:  version: VERSION  js:    assets/js/build/main.js: {scope: footer}  css:  component:     assets/js/build/main.css: {}  dependencies:    - core/drupal #don't pull me up on indenting its right this aint my first rodio 

(Indenting may not reflect the correct modules code)

now the workflow:

I ran “npm run-script build” which builds the static build dir with the correct “main.js” & “main.css”

move the build folder to “MYMODULE/assets/js/”

called the lib in my block:

public function build() {   $  build = [];   $  build['#cache']['max-age'] = 0;    $  build['something']['#markup'] = '<div id="root"></div>';   $  build['#attached']['library'] = [     'mymodule/somemodule.block.component',   ];   return $  build; } 

(like i have done manny (many) times before )

and get some crazy non helpful error (https://reactjs.org/docs/error-decoder.html/?invariant=200)

So the question is, has anyone been able to add (as of June 2019) a pre built (static served react app) to Drupal 8.7.3 if so please share thoughts.

possible duplicates: How do I include a React app? (don’t think this will work)

ps admins may not think this is a “Drupal” question due to various different types of ways react and Drupal can work together

however: https://reactfordrupal.com/

https://www.drupal.org/project/drupal/issues/2926656 + many many many more.

Where i am think Answer is, ejecting and config separate ?!