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export interface Options {
/**
Use a custom environment variables object.
Default: [`process.env`](https://nodejs.org/api/process.html#process_process_env).
*/
readonly env?: Record<string, string | undefined>;
/**
Get the PATH key for a specific platform.
Default: [`process.platform`](https://nodejs.org/api/process.html#process_process_platform).
*/
readonly platform?: NodeJS.Platform;
}
/**
Get the [PATH](https://en.wikipedia.org/wiki/PATH_(variable)) environment variable key cross-platform.
@example
```
import pathKey from 'path-key';
const key = pathKey();
//=> 'PATH'
const PATH = process.env[key];
//=> '/usr/local/bin:/usr/bin:/bin'
```
*/
export default function pathKey(options?: Options): string;