/**
 * @file NODE_ENV environment variable getter. Exports `getNodeEnv()`, returning
 *   the raw `NODE_ENV` value (typically 'production', 'development', or 'test')
 *   or `undefined` when unset.
 */
/**
 * Returns the value of the NODE_ENV environment variable.
 *
 * @example
 *   ;```typescript
 *   import { getNodeEnv } from '@socketsecurity/lib/env/node-env'
 *
 *   const env = getNodeEnv()
 *   // e.g. 'production', 'development', 'test', or undefined
 *   ```
 *
 * @returns The Node.js environment mode, or `undefined` if not set
 */
export declare function getNodeEnv(): string | undefined;
