Get the PATH environment variable key cross-platform
npm install path-key> Get the PATH) environment variable key cross-platform
It's usually PATH but on Windows it can be any casing like Path...
```
$ npm install path-key
`js
import pathKey from 'path-key';
const key = pathKey();
//=> 'PATH'
const PATH = process.env[key];
//=> '/usr/local/bin:/usr/bin:/bin'
`
#### options
Type: object
##### env
Type: object\process.env
Default:
Use a custom environment variables object.
#### platform
Type: string\process.platform`
Default:
Get the PATH key for a specific platform.
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