import type { PackageManager, PackageManagerSelection } from "../../core/types/index.js";
/**
 * Find nearest ancestor directory that contains package.json.
 *
 * Postcondition: returns an absolute path.
 */
export declare function findProjectRoot(startDir: string): string;
/**
 * Resolve effective package manager for a given cwd and optional user selection.
 *
 * Invariant: if selection ∈ {npm,pnpm,yarn} it always wins over auto detection.
 */
export declare function resolvePackageManager(params: {
    readonly cwd: string;
    readonly selection?: PackageManagerSelection;
}): {
    readonly projectRoot: string;
    readonly packageManager: PackageManager;
};
/**
 * Format a dev-dependency install command for a package manager.
 */
export declare function formatInstallDevCommand(packageManager: PackageManager, packages: readonly string[]): string;
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