feat(nest): Support Fastify in NestJS Application Generator

[vrxj81]

What problem does this feature solve?
Currently, the Nx NestJS application generator scaffolds applications using Express by default. Developers who prefer Fastify for its performance and low overhead have to manually reconfigure their applications.

Proposed Solution:
Add a --framework option (or similar) to the NestJS application generator that allows choosing between express and fastify. If fastify is selected:

• Generate a NestJS app preconfigured with @nestjs/platform-fastify.
  -Scaffold the main file (main.ts) with Fastify bootstrap code.
• Adjust package dependencies to include @nestjs/platform-fastify instead of (or in addition to) @nestjs/platform-express.

Additional Context:

• This would align Nx even closer to the official NestJS documentation, which supports both frameworks.
• Fastify support has been requested multiple times in the NestJS ecosystem.

Motivation:

• Developers can choose the framework best suited for their use case at project generation time.
• Improve first-party experience for Fastify users.

[Bil-lion-aire]

Been having the same issue, will we get an update on it? Currently I have a new project and get stuck from error to error manually fixing all the changes necessary

[vrxj81]

I haven’t run into issues that much, but just don’t want to so much manual and repetitive work.
I actually submitted a PR for support for Fastify in the @nx/nest application generator.
What issues doe you run into? What would make your developer experience better?

[Bil-lion-aire]

Any update on that?