/**
 * Environment detection utilities for Next.js configuration.
 * @internal
 */
/**
 * Supported environment modes for configuration loading.
 */
export type EnvironmentMode = 'development' | 'production' | 'test';
/**
 * Detect the current environment mode based on NODE_ENV.
 *
 * @returns The detected environment mode:
 *   - 'production' if NODE_ENV is 'production'
 *   - 'test' if NODE_ENV is 'test'
 *   - 'development' for all other cases (including undefined)
 *
 * @example
 * ```typescript
 * // NODE_ENV=production
 * detectEnvironment(); // 'production'
 *
 * // NODE_ENV=test
 * detectEnvironment(); // 'test'
 *
 * // NODE_ENV=development or undefined
 * detectEnvironment(); // 'development'
 * ```
 */
export declare function detectEnvironment(): EnvironmentMode;
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