What happened?

If you don't have a required tool like npm installed, and you run pulumi new typescript, it will attempt to run npm install and fail because npm isn't available. At this point you have a partially initialized project, and it's unclear what you're supposed to do to address the problem. If you run pulumi new again, it'll error about existing files in the directory and can error about conflicting names (because the stack was already previously created).

Expected Behavior

At a minimum, when a required tool isn't available (e.g. npm isn't on PATH) we should emit a better message to the user. It doesn't even have to necessarily be an error. It could just be something along the lines of "your project has been created but needs to have dependencies installed. Install npm and then run npm install in this directory".

Steps to reproduce

Run on a machine that doesn't have npm installed, or as follows:

$ PATH="" /Users/user/.pulumi-dev/bin/pulumi new typescript
This command will walk you through creating a new Pulumi project.

Enter a value or leave blank to accept the (default), and press <ENTER>.
Press ^C at any time to quit.

project name: (myproject)
project description: (A minimal TypeScript Pulumi program)
Created project 'myproject'

Please enter your desired stack name.
To create a stack in an organization, use the format <org-name>/<stack-name> (e.g. `acmecorp/dev`).
stack name: (dev)
Created stack 'dev'

Installing dependencies...

error: installing dependencies failed; rerun manually to try again, then run `pulumi up` to perform an initial deployment: npm install failed: could not find npm on the $PATH; npm is installed with Node.js available at https://nodejs.org/: exec: "npm": executable file not found in $PATH

Output of pulumi about

$ pulumi about
CLI
Version      3.75.1-dev.0
Go Version   go1.20.5
Go Compiler  gc

Host
OS       darwin
Version  12.6.6
Arch     arm64

Additional context

No response

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