cdktf-cli: Support non-global installs (and report a correct error message if not supported)

[fbartho]

Description

In order to minimize "it works on my machine" type errors, we have a policy of not globally installing helper tools. We use NVM to ensure our node-version is correct within every project. And we use yarn to access locally installed binaries without hardcoding paths.

Unfortunately, cdktf-cli init throws an error when executed within a local-install / yarn context.

$ yarn cdktf init --template=typescript --providers=kreuzwerker/docker --local
(node:35155) [DEP0040] DeprecationWarning: The `punycode` module is deprecated. Please use a userland alternative instead.
(Use `node --trace-deprecation ...` to show where the warning was created)
ERROR: Cannot initialize a project in a non-empty directory

This ERROR goes away if you globally install it and run the same command (without yarn) in the same directory.

Even if you don't support the feature request, this is an incorrect or at least very confusing error message for this condition, so if this ticket gets closed, we should open another one for that issue.

References

• Allowing to initiate (cdktf init) a project in an empty directory.  #1697
• cdktf-init typescript template general QOL improvements #2490

Help Wanted

• I'm interested in contributing a fix myself

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