import { type Dialect } from 'posix-regex';
/**
 * Platform differences, like less's per-platform defines headers
 * (defines.h for unix, defines.wn for Windows, defines.ds/o2 for the
 * DOS and OS/2 builds): file names, shells, editors and quoting all
 * differ between the Windows console world and unix. Node's unix
 * family (linux, darwin, the BSDs, aix, sunos) takes less's autoconf
 * build values; win32 takes defines.wn's.
 */
export declare const isWindows: boolean;
/**
 * The home directory, like less resolving $HOME with main.c's Windows
 * fallback to HOMEDRIVE+HOMEPATH; $HOME wins when set on either
 * platform, like lgetenv("HOME").
 */
export declare function homeDir(): string;
/** The history file name (LESSHISTFILE: ".lesshst" / "_lesshst"). */
export declare const HISTFILE_NAME: string;
/** The lesskey source name (DEF_LESSKEYINFILE: ".lesskey"/"_lesskey"). */
export declare const LESSKEYIN_NAME: string;
/** The binary lesskey name (LESSKEYFILE: ".less" / "_less"). */
export declare const LESSKEYFILE_NAME: string;
/** The system-wide lesskey source (LESSKEYINFILE_SYS). */
export declare const LESSKEYIN_SYS: string;
/** The default system-wide compiled lesskey file (LESSKEYFILE_SYS). */
export declare const LESSKEYFILE_SYS: string;
/** The default editor (EDIT_PGM: "vi", "edit" on Windows). */
export declare const EDIT_PGM: string;
/**
 * True where less's --exit-follow-on-close can actually fire: check_poll
 * (os.c:167) exits the F wait only on a BARE POLLHUP — a drained,
 * closed pipe reports exactly that on Linux, but Darwin adds POLLIN
 * (EOF counts as readable) and less's Windows build has no HUP check at
 * all, so less's F on a closed pipe just keeps waiting there — and so
 * do we.
 */
export declare const POLLHUP_EXITS_F: boolean;
/**
 * The regex dialect less's own search would use here.
 *
 * configure.ac tries POSIX regcomp FIRST and only falls through to
 * PCRE2/PCRE/GNU when it is missing or broken, so less links whatever
 * regcomp the platform's libc ships: Spencer's on the BSDs, glibc
 * everywhere else. The two disagree on what POSIX leaves undefined, so
 * the dialect is a platform fact like DEF_METACHARS, not a preference.
 * The library's own default IS the glibc shape, so only the BSDs need
 * saying and everything else falls through to it.
 *
 * (less's Windows build links neither — defines.wn takes Spencer's V8
 * regcomp, which has no {n,m} intervals at all. We keep the POSIX
 * reading there rather than give a JS user a pager whose search has
 * lost counted repetition.)
 */
export declare const REGEX_DIALECT: Dialect;
/** Shell metacharacters (DEF_METACHARS, defines.wn's smaller set). */
export declare const DEF_METACHARS: string;
/** The metachar escape (DEF_METAESCAPE): the Windows shell has no
 *  backslash escaping, so names quote-wrap instead. */
export declare const DEF_METAESCAPE: string;
/**
 * The shell argv for a ! command or a preprocessor pipe: unix runs
 * `$SHELL -c cmd` (less's HAVE_SHELL, with LESS_SHELL_COPTION replacing
 * -c and a bare "-" dropping the wrapper); less's Windows build has
 * HAVE_SHELL=0 and hands the command to system(), i.e. %COMSPEC% /c,
 * with an empty command opening the shell itself (lsystem.c).
 */
export declare function shellArgv(cmd: string): [string, string[]];