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