/**
 * Platform detection helpers for the installer.
 *
 * Kept narrow on purpose — `process.platform` everywhere else in the
 * installer is funneled through here so tests can stub a single point.
 */
export type SupportedPlatform = 'linux' | 'darwin' | 'win32';
export declare function detectPlatform(p?: NodeJS.Platform): SupportedPlatform;
export declare function isPosix(p: SupportedPlatform): boolean;