/** Where this CLI is installed: `prefix` for npm, `nodeModules` for reading the version back. */
export type InstallRoot = {
    prefix: string;
    nodeModules: string;
};
/**
 * The prefix to upgrade in place, or null when the layout is not npm's.
 *
 * Guarded on purpose: npx, pnpm and bun all nest the package under a bare `node_modules`, and
 * installing into their trees would report a success the PATH binary never sees.
 */
export declare function resolveInstallRoot(packageRoot: string, platform: typeof process.platform, onDisk?: (candidate: string) => boolean): InstallRoot | null;
export declare function installRoot(): InstallRoot | null;
/** This package's own dir under a prefix's node_modules. */
export declare function installedPackageDir(nodeModules: string): string;
/** The version on disk under a prefix, which is the only account of what `@latest` resolved to. */
export declare function readInstalledVersion(nodeModules: string): string | null;