/**
 * npm_config_registry environment variable.
 * NPM registry URL configured by package managers.
 */
/*@__NO_SIDE_EFFECTS__*/
export declare function getNpmConfigRegistry(): string | undefined;
/**
 * npm_config_user_agent environment variable.
 * User agent string set by npm/pnpm/yarn package managers.
 */
/*@__NO_SIDE_EFFECTS__*/
export declare function getNpmConfigUserAgent(): string | undefined;
/**
 * npm_lifecycle_event environment variable.
 * The name of the npm lifecycle event that's currently running.
 */
/*@__NO_SIDE_EFFECTS__*/
export declare function getNpmLifecycleEvent(): string | undefined;
/**
 * NPM_REGISTRY environment variable.
 * NPM registry URL override.
 */
/*@__NO_SIDE_EFFECTS__*/
export declare function getNpmRegistry(): string | undefined;
/**
 * NPM_TOKEN environment variable.
 * Authentication token for NPM registry access.
 */
/*@__NO_SIDE_EFFECTS__*/
export declare function getNpmToken(): string | undefined;
