/**
 * NodeEnvManager is used to extract a normalized node environment by
 * inspecting the "process.env.NODE_ENV".
 *
 * - The "test" and "testing" envs are normalized to "test"
 * - The "prod" and "production" envs are normalized to "production"
 * - The "dev", "develop", and "development" envs are normalized to "development"
 * - Unknown or invalid environments remain as-is
 *
 * @example
 * const manager = new NodeEnvManager()
 * manager.process()
 * console.log(manager.nodeEnvironment) // 'development', 'production', 'test', or custom
 */
export declare class NodeEnvManager {
    #private;
    /**
     * The normalized node environment value. Defaults to 'unknown' until process() is called.
     *
     * @type {'unknown' | 'development' | 'production' | 'test' | string}
     * @default 'unknown'
     */
    nodeEnvironment: 'unknown' | 'development' | 'production' | 'test' | string;
    /**
     * Captures and normalizes the current NODE_ENV value from process.env.
     * Sets the nodeEnvironment property with the normalized value.
     */
    process(): void;
}