what does "-ar 48000" do in ffmpeg , not mentioned

lcm is wrong lcm = (num times num2) / (**gcd)

create-react-app is discouraged by react team https://react.dev/learn/start-a-new-react-project

react-jsonschema-form is worth mentioning https://rjsf-team.github.io/react-jsonschema-form/docs/

Object Deep Clone code fails for Map data structure https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/JSON/stringify

I am using typescript, and I regret for using it. If you support typescript, that means you have not came to a point where typescript becomes pain and you begin to use ts-ignore comments yet Types may be exist, but world is not perfect, every module has not been written in typescript. Using TS looks as if it is trying to tame wild JS.

react recommends functional components

use set and do it in one line [...new Set(...array)]

from npmjs.org This package is а part of KendoReact—a commercial UI library. You will need to install a license key when adding the package to your project. For more information, please refer to the KendoReact My License page. To receive a license key, you need to either purchase a license or register for a free trial. Doing so indicates that you accept the KendoReact License Agreement. The 30-day free trial gives you access to all the KendoReact components and their full functionality. Additionally, for the period of your license, you get access to our legendary technical support provided directly by the KendoReact dev team! I recommend https://react-jsonschema-form.readthedocs.io/en/latest/

from MDN: Connection-specific header fields such as Connection and Keep-Alive are prohibited in HTTP/2 and HTTP/3. Chrome and Firefox ignore them in HTTP/2 responses, but Safari conforms to the HTTP/2 specification requirements and does not load any response that contains them.