You use the Nest Framework and Visual Studio Code to develop an extension application.

For Node.js/TypeScript development with frameworks like NestJS, the environment supports:

Automatic rebuild (A): Tools like ts-node-dev or the Nest CLI recompile TypeScript on file changes.

Debug JavaScript/TypeScript with breakpoints (D): Visual Studio Code supports debugging Node.js applications and stopping on breakpoints.

Incorrect options:

B: Debugging Java applications requires JVM and Java tooling, not applicable to NestJS.

C: Auto-redeploy implies container or platform redeployment; local development normally only rebuilds and restarts, not redeploys.