import { execFileSync } from "node:child_process";
/** Injection seam for PATH resolution + version probes, so tests can stub syscalls. */
export interface ProbeDeps {
    platform?: NodeJS.Platform;
    env?: NodeJS.ProcessEnv;
    execFileSyncFn?: typeof execFileSync;
    existsSyncFn?: (p: string) => boolean;
}
/** Resolve a command name on PATH via `which`/`where`; returns null when missing. */
export declare function resolveCommandOnPath(command: string, deps?: ProbeDeps): string | null;
/** Run `<command> [...args] --version` and return the first output line, or null. */
export declare function readCommandVersion(command: string, args?: string[], deps?: ProbeDeps): string | null;