| /// <reference types="node" /> | 
|   | 
| declare namespace pathKey { | 
|     interface Options { | 
|         /** | 
|         Use a custom environment variables object. Default: [`process.env`](https://nodejs.org/api/process.html#process_process_env). | 
|         */ | 
|         readonly env?: {[key: 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; | 
|     } | 
| } | 
|   | 
| declare const pathKey: { | 
|     /** | 
|     Get the [PATH](https://en.wikipedia.org/wiki/PATH_(variable)) environment variable key cross-platform. | 
|   | 
|     @example | 
|     ``` | 
|     import pathKey = require('path-key'); | 
|   | 
|     const key = pathKey(); | 
|     //=> 'PATH' | 
|   | 
|     const PATH = process.env[key]; | 
|     //=> '/usr/local/bin:/usr/bin:/bin' | 
|     ``` | 
|     */ | 
|     (options?: pathKey.Options): string; | 
|   | 
|     // TODO: Remove this for the next major release, refactor the whole definition to: | 
|     // declare function pathKey(options?: pathKey.Options): string; | 
|     // export = pathKey; | 
|     default: typeof pathKey; | 
| }; | 
|   | 
| export = pathKey; |