node.js - Is it a good approach to use different compiler and module combination between project build process and unit tests

Question

New to the typescript. I'm trying to use mocha framework to add unit tests to one our nodeJS/typescript projects.

Our typescript application uses tsc compiler with esnext module.

I couldn't able to make Mocha to use esnext module to run the tests (it works fine with commonjs module). Seems like ts-node doesn't detect the imports with esnext module, but it has no issues when used with commonjs module.

• So, I'm wondering is it a good practice to use different compiler and module combination between project build process and unit tests? i.e. tsc and esnext for build process and ts-node and commonjs for unit test.
• Are there any potential issues/risks we might face in future if we proceed with this approach?
• Is there any way to make Mocha to use tsc with esnext or ts-node with commonjs or ts-node with esnext?
• Or Am I missing something conceptually with the way typescript or Mocha work?