import { c as commonjsGlobal } from './vendor-_commonjsHelpers.4da45ef5.mjs';
import assert$1 from 'assert';
import require$$2 from 'events';

var signalExit = {exports: {}};

var signals$1 = {exports: {}};

var hasRequiredSignals;

function requireSignals () {
	if (hasRequiredSignals) return signals$1.exports;
	hasRequiredSignals = 1;
	(function (module) {
		// This is not the set of all possible signals.
		//
		// It IS, however, the set of all signals that trigger
		// an exit on either Linux or BSD systems.  Linux is a
		// superset of the signal names supported on BSD, and
		// the unknown signals just fail to register, so we can
		// catch that easily enough.
		//
		// Don't bother with SIGKILL.  It's uncatchable, which
		// means that we can't fire any callbacks anyway.
		//
		// If a user does happen to register a handler on a non-
		// fatal signal like SIGWINCH or something, and then
		// exit, it'll end up firing `process.emit('exit')`, so
		// the handler will be fired anyway.
		//
		// SIGBUS, SIGFPE, SIGSEGV and SIGILL, when not raised
		// artificially, inherently leave the process in a
		// state from which it is not safe to try and enter JS
		// listeners.
		module.exports = [
		  'SIGABRT',
		  'SIGALRM',
		  'SIGHUP',
		  'SIGINT',
		  'SIGTERM'
		];

		if (process.platform !== 'win32') {
		  module.exports.push(
		    'SIGVTALRM',
		    'SIGXCPU',
		    'SIGXFSZ',
		    'SIGUSR2',
		    'SIGTRAP',
		    'SIGSYS',
		    'SIGQUIT',
		    'SIGIOT'
		    // should detect profiler and enable/disable accordingly.
		    // see #21
		    // 'SIGPROF'
		  );
		}

		if (process.platform === 'linux') {
		  module.exports.push(
		    'SIGIO',
		    'SIGPOLL',
		    'SIGPWR',
		    'SIGSTKFLT',
		    'SIGUNUSED'
		  );
		}
} (signals$1));
	return signals$1.exports;
}

// Note: since nyc uses this module to output coverage, any lines
// that are in the direct sync flow of nyc's outputCoverage are
// ignored, since we can never get coverage for them.
// grab a reference to node's real process object right away
var process$1 = commonjsGlobal.process;

const processOk = function (process) {
  return process &&
    typeof process === 'object' &&
    typeof process.removeListener === 'function' &&
    typeof process.emit === 'function' &&
    typeof process.reallyExit === 'function' &&
    typeof process.listeners === 'function' &&
    typeof process.kill === 'function' &&
    typeof process.pid === 'number' &&
    typeof process.on === 'function'
};

// some kind of non-node environment, just no-op
/* istanbul ignore if */
if (!processOk(process$1)) {
  signalExit.exports = function () {
    return function () {}
  };
} else {
  var assert = assert$1;
  var signals = requireSignals();
  var isWin = /^win/i.test(process$1.platform);

  var EE = require$$2;
  /* istanbul ignore if */
  if (typeof EE !== 'function') {
    EE = EE.EventEmitter;
  }

  var emitter;
  if (process$1.__signal_exit_emitter__) {
    emitter = process$1.__signal_exit_emitter__;
  } else {
    emitter = process$1.__signal_exit_emitter__ = new EE();
    emitter.count = 0;
    emitter.emitted = {};
  }

  // Because this emitter is a global, we have to check to see if a
  // previous version of this library failed to enable infinite listeners.
  // I know what you're about to say.  But literally everything about
  // signal-exit is a compromise with evil.  Get used to it.
  if (!emitter.infinite) {
    emitter.setMaxListeners(Infinity);
    emitter.infinite = true;
  }

  signalExit.exports = function (cb, opts) {
    /* istanbul ignore if */
    if (!processOk(commonjsGlobal.process)) {
      return function () {}
    }
    assert.equal(typeof cb, 'function', 'a callback must be provided for exit handler');

    if (loaded === false) {
      load();
    }

    var ev = 'exit';
    if (opts && opts.alwaysLast) {
      ev = 'afterexit';
    }

    var remove = function () {
      emitter.removeListener(ev, cb);
      if (emitter.listeners('exit').length === 0 &&
          emitter.listeners('afterexit').length === 0) {
        unload();
      }
    };
    emitter.on(ev, cb);

    return remove
  };

  var unload = function unload () {
    if (!loaded || !processOk(commonjsGlobal.process)) {
      return
    }
    loaded = false;

    signals.forEach(function (sig) {
      try {
        process$1.removeListener(sig, sigListeners[sig]);
      } catch (er) {}
    });
    process$1.emit = originalProcessEmit;
    process$1.reallyExit = originalProcessReallyExit;
    emitter.count -= 1;
  };
  signalExit.exports.unload = unload;

  var emit = function emit (event, code, signal) {
    /* istanbul ignore if */
    if (emitter.emitted[event]) {
      return
    }
    emitter.emitted[event] = true;
    emitter.emit(event, code, signal);
  };

  // { <signal>: <listener fn>, ... }
  var sigListeners = {};
  signals.forEach(function (sig) {
    sigListeners[sig] = function listener () {
      /* istanbul ignore if */
      if (!processOk(commonjsGlobal.process)) {
        return
      }
      // If there are no other listeners, an exit is coming!
      // Simplest way: remove us and then re-send the signal.
      // We know that this will kill the process, so we can
      // safely emit now.
      var listeners = process$1.listeners(sig);
      if (listeners.length === emitter.count) {
        unload();
        emit('exit', null, sig);
        /* istanbul ignore next */
        emit('afterexit', null, sig);
        /* istanbul ignore next */
        if (isWin && sig === 'SIGHUP') {
          // "SIGHUP" throws an `ENOSYS` error on Windows,
          // so use a supported signal instead
          sig = 'SIGINT';
        }
        /* istanbul ignore next */
        process$1.kill(process$1.pid, sig);
      }
    };
  });

  signalExit.exports.signals = function () {
    return signals
  };

  var loaded = false;

  var load = function load () {
    if (loaded || !processOk(commonjsGlobal.process)) {
      return
    }
    loaded = true;

    // This is the number of onSignalExit's that are in play.
    // It's important so that we can count the correct number of
    // listeners on signals, and don't wait for the other one to
    // handle it instead of us.
    emitter.count += 1;

    signals = signals.filter(function (sig) {
      try {
        process$1.on(sig, sigListeners[sig]);
        return true
      } catch (er) {
        return false
      }
    });

    process$1.emit = processEmit;
    process$1.reallyExit = processReallyExit;
  };
  signalExit.exports.load = load;

  var originalProcessReallyExit = process$1.reallyExit;
  var processReallyExit = function processReallyExit (code) {
    /* istanbul ignore if */
    if (!processOk(commonjsGlobal.process)) {
      return
    }
    process$1.exitCode = code || /* istanbul ignore next */ 0;
    emit('exit', process$1.exitCode, null);
    /* istanbul ignore next */
    emit('afterexit', process$1.exitCode, null);
    /* istanbul ignore next */
    originalProcessReallyExit.call(process$1, process$1.exitCode);
  };

  var originalProcessEmit = process$1.emit;
  var processEmit = function processEmit (ev, arg) {
    if (ev === 'exit' && processOk(commonjsGlobal.process)) {
      /* istanbul ignore else */
      if (arg !== undefined) {
        process$1.exitCode = arg;
      }
      var ret = originalProcessEmit.apply(this, arguments);
      /* istanbul ignore next */
      emit('exit', process$1.exitCode, null);
      /* istanbul ignore next */
      emit('afterexit', process$1.exitCode, null);
      /* istanbul ignore next */
      return ret
    } else {
      return originalProcessEmit.apply(this, arguments)
    }
  };
}

export { signalExit as s };