Please follow the instruction.
Install dependencies
npm install
Run orders api http and websocket server
npm start orders-api
Run order book react application
npm start order-book
Orders rest api
npm run test orders-api
Order Book react application
npm run test order-book
Orders Matching Engine
npm run test order-matching-engine
Mono repository with orders api, order book react application and order matching engine
Repository is bootstrapped with nx the applications and libraries are on apps and libs folder
There is an orders rest api and a order book react application under the apps folder and the order matching engine and orders-api-interfaces that is things that are commonly used by the client and the server under the libs folder
Sorry if there are a lot of files i tried to do it as realistic as possible, the entry point of the orders api is in main.ts under the orders-api app that will run the main function of app and start a worker thread to run the order matching engine, it add it by middleware to the request object as part of a context and is accessible in the orders.router.ts from there on it communicates between threads through messages.
in the react application i didn't add a router because there was just one page, the orders component displays the order list and create order form, most of the logic and state management is on use-order-book.hook.ts
i tried to develop everything without the use of libraries so you can evaluate but probably there are a couple of things that you may want to add libraries for. order-matching-engine.model.ts contains the logic to interact with the server and maintain state of the order book and order-matching-engine.service.ts contains the most of the logic of the engine (if you restart the server the data of the order book will be wiped because is stored in memory).
i hope you like it :)