/** What `PHREN_CODEX_BINARY=off` resolves to: a path no spawn can run, so every
 * helper call fails as if codex were not installed. The vitest config sets it:
 * Codex 0.158 leaves a detached `app-server --managed-daemon` behind for the
 * HOME it ran under, and a test run's throwaway HOME is deleted under it. */
export declare const CODEX_OFF = "/nonexistent/phren-codex-off";
/** The `codex` the Hook runs for its own helper calls (`codex queue`, `codex
 * app-server`). `phren init` can put a session wrapper at ~/.local/bin/codex
 * that runs phren's session-start hook before the real binary for every
 * subcommand except a bare --help. That takes seconds (about 8 s on the Linux
 * box), longer than the Hook's 5 s `codex queue --help` probe, so Codex async
 * questions were reported as terminal-only, and each call opened a phren
 * session. The Hook skips its own wrapper and runs the binary it names. */
export declare function codexExecutable(env?: NodeJS.ProcessEnv): string;
/** The real binary a phren session wrapper names, "" for a phren wrapper
 * whose target cannot be read, undefined for anything else. */
export declare function phrenWrapperTarget(file: string): string | undefined;