package.json file already exists in target directory

[jebarpg]

Prerequisites

• [X] I have written a descriptive issue title
• [X] I have searched existing issues to ensure the bug has not already been reported

Fastify version

4.25.2

Plugin version

No response

Node.js version

21.6.1

Operating system

Linux

Operating system version (i.e. 20.04, 11.3, 10)

Clear Linux OS installed version 40410

Description

fastify generate should update the package.json file and not error out that the package.json file already exists. Basically there should be a check for the file and if it exists then read it into a json object then work with adding new key,values that are needed for the generated typescript or javascript project boilerplate. This should be done for the tsconfig.json as well. The npm pkg can be used for this as well npm pkg set See: https://docs.npmjs.com/cli/v7/commands/npm-pkg

Steps to Reproduce

I run bun init to generate a package.json file and tsconfig.json file then I run fastify generate --lang=ts . to generate a typescript project in the current directory and get the error: a package.json file already exists in target directory

Expected Behavior

No response