Node.js returns platform as darwin when running on windows

[swrdfish]

Description:
While running a node.js application on windows machine, process.platform returns darwin
The same behaviour is noticed when using os.platform()

Action version:
Using `actions/setup-node@v2

Platform:

• Ubuntu
• macOS
• Windows

Runner type:

• Hosted
• Self-hosted

Tools version:

node-version: 16.17.0

Repro steps:
Run any node script and console log process.platform

console.log(process.platform) // returns 'darwin'

Expected behavior:
Should return 'win32'

Actual behavior:
Returns 'darwin'