139 Initial TS Migration, Setup TS Jest, and Update ESLint

[hiyaryan]

This PR sets up the initial TS Jest testing environment and uses mongodb-memory-server. The following changes were made (also in commit body) in order to allow Jest to understand TypeScript. A test has been made for index.ts that itself tests this setup. Additionally, some minor changes have been added, adding/updating comments in the files worked on and including a graceful shutdown in index.ts.

• Updated package.json:

  • Changed the development script to use tsc --watch instead of tsx watch.
  • Added development dependencies: @babel/preset-typescript, @types/express, @types/jest, mongodb-memory-server, and ts-node.

• Modified db.js:

  • Replaced default import with named import for mongoose.
  • Exported mongoose as db to ensure consistent type definitions.

• Updated index.ts:

  • Added comments and structured the server startup logic.
  • Implemented a graceful shutdown mechanism using process.on to listen for SIGINT and SIGTERM signals.

• Created index.test.ts:

  • Added initial Jest tests to verify server startup in non-production mode.
  • Mocked console.log and added assertions to check server behavior.

• Modified Jest setup and teardown scripts:

  • Simplified the setup by combining imports and logging the seeding process.
  • Added a console log statement in the teardown script for clarity.

[hiyaryan]

Overall it's looking really good! Great job! The main thing is I want to make sure we understand what the babel typescript preset does and doesn't do, and confirm that it fits our needs. The rest of the review is a couple of questions I had and edits I think would be helpful.

Awesome! Thank you for the reviews @davidzlu. I should have resolved and responded to all of them. Most importantly, I added type checking to the tests and removed that pesky extra whitespace. Please have a look and let me know what you think!