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result : trailingEdge(now());\n  }\n\n  function debounced() {\n    var time = now(),\n        isInvoking = shouldInvoke(time);\n\n    lastArgs = arguments;\n    lastThis = this;\n    lastCallTime = time;\n\n    if (isInvoking) {\n      if (timerId === undefined) {\n        return leadingEdge(lastCallTime);\n      }\n      if (maxing) {\n        // Handle invocations in a tight loop.\n        timerId = setTimeout(timerExpired, wait);\n        return invokeFunc(lastCallTime);\n      }\n    }\n    if (timerId === undefined) {\n      timerId = setTimeout(timerExpired, wait);\n    }\n    return result;\n  }\n  debounced.cancel = cancel;\n  debounced.flush = flush;\n  return debounced;\n}\n\n/**\n * Checks if `value` is the\n * [language type](http://www.ecma-international.org/ecma-262/7.0/#sec-ecmascript-language-types)\n * of `Object`. (e.g. arrays, functions, objects, regexes, `new Number(0)`, and `new String('')`)\n *\n * @static\n * @memberOf _\n * @since 0.1.0\n * @category Lang\n * @param {*} value The value to check.\n * @returns {boolean} Returns `true` if `value` is an object, else `false`.\n * @example\n *\n * _.isObject({});\n * // => true\n *\n * _.isObject([1, 2, 3]);\n * // => true\n *\n * _.isObject(_.noop);\n * // => true\n *\n * _.isObject(null);\n * // => false\n */\nfunction isObject(value) {\n  var type = typeof value;\n  return !!value && (type == 'object' || type == 'function');\n}\n\n/**\n * Checks if `value` is object-like. A value is object-like if it's not `null`\n * and has a `typeof` result of \"object\".\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category Lang\n * @param {*} value The value to check.\n * @returns {boolean} Returns `true` if `value` is object-like, else `false`.\n * @example\n *\n * _.isObjectLike({});\n * // => true\n *\n * _.isObjectLike([1, 2, 3]);\n * // => true\n *\n * _.isObjectLike(_.noop);\n * // => false\n *\n * _.isObjectLike(null);\n * // => false\n */\nfunction isObjectLike(value) {\n  return !!value && typeof value == 'object';\n}\n\n/**\n * Checks if `value` is classified as a `Symbol` primitive or object.\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category Lang\n * @param {*} value The value to check.\n * @returns {boolean} Returns `true` if `value` is a symbol, else `false`.\n * @example\n *\n * _.isSymbol(Symbol.iterator);\n * // => true\n *\n * _.isSymbol('abc');\n * // => false\n */\nfunction isSymbol(value) {\n  return typeof value == 'symbol' ||\n    (isObjectLike(value) && objectToString.call(value) == symbolTag);\n}\n\n/**\n * Converts `value` to a number.\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category Lang\n * @param {*} value The value to process.\n * @returns {number} Returns the number.\n * @example\n *\n * _.toNumber(3.2);\n * // => 3.2\n *\n * _.toNumber(Number.MIN_VALUE);\n * // => 5e-324\n *\n * _.toNumber(Infinity);\n * // => Infinity\n *\n * _.toNumber('3.2');\n * // => 3.2\n */\nfunction toNumber(value) {\n  if (typeof value == 'number') {\n    return value;\n  }\n  if (isSymbol(value)) {\n    return NAN;\n  }\n  if (isObject(value)) {\n    var other = typeof value.valueOf == 'function' ? value.valueOf() : value;\n    value = isObject(other) ? (other + '') : other;\n  }\n  if (typeof value != 'string') {\n    return value === 0 ? value : +value;\n  }\n  value = value.replace(reTrim, '');\n  var isBinary = reIsBinary.test(value);\n  return (isBinary || reIsOctal.test(value))\n    ? freeParseInt(value.slice(2), isBinary ? 2 : 8)\n    : (reIsBadHex.test(value) ? NAN : +value);\n}\n\nmodule.exports = debounce;\n","\n/**\n * Module dependencies.\n */\n\nvar sep = require('path').sep || '/';\n\n/**\n * Module exports.\n */\n\nmodule.exports = fileUriToPath;\n\n/**\n * File URI to Path function.\n *\n * @param {String} uri\n * @return {String} path\n * @api public\n */\n\nfunction fileUriToPath (uri) {\n  if ('string' != typeof uri ||\n      uri.length <= 7 ||\n      'file://' != uri.substring(0, 7)) {\n    throw new TypeError('must pass in a file:// URI to convert to a file path');\n  }\n\n  var rest = decodeURI(uri.substring(7));\n  var firstSlash = rest.indexOf('/');\n  var host = rest.substring(0, firstSlash);\n  var path = rest.substring(firstSlash + 1);\n\n  // 2.  Scheme Definition\n  // As a special case, <host> can be the string \"localhost\" or the empty\n  // string; this is interpreted as \"the machine from which the URL is\n  // being interpreted\".\n  if ('localhost' == host) host = '';\n\n  if (host) {\n    host = sep + sep + host;\n  }\n\n  // 3.2  Drives, drive letters, mount points, file system root\n  // Drive letters are mapped into the top of a file URI in various ways,\n  // depending on the implementation; some applications substitute\n  // vertical bar (\"|\") for the colon after the drive letter, yielding\n  // \"file:///c|/tmp/test.txt\".  In some cases, the colon is left\n  // unchanged, as in \"file:///c:/tmp/test.txt\".  In other cases, the\n  // colon is simply omitted, as in \"file:///c/tmp/test.txt\".\n  path = path.replace(/^(.+)\\|/, '$1:');\n\n  // for Windows, we need to invert the path separators from what a URI uses\n  if (sep == '\\\\') {\n    path = path.replace(/\\//g, '\\\\');\n  }\n\n  if (/^.+\\:/.test(path)) {\n    // has Windows drive at beginning of path\n  } else {\n    // unix path…\n    path = sep + path;\n  }\n\n  return host + path;\n}\n","/**\n * Module dependencies.\n */\n\nvar fs = require('fs'),\n  path = require('path'),\n  fileURLToPath = require('file-uri-to-path'),\n  join = path.join,\n  dirname = path.dirname,\n  exists =\n    (fs.accessSync &&\n      function(path) {\n        try {\n          fs.accessSync(path);\n        } catch (e) {\n          return false;\n        }\n        return true;\n      }) ||\n    fs.existsSync ||\n    path.existsSync,\n  defaults = {\n    arrow: process.env.NODE_BINDINGS_ARROW || ' → ',\n    compiled: process.env.NODE_BINDINGS_COMPILED_DIR || 'compiled',\n    platform: process.platform,\n    arch: process.arch,\n    nodePreGyp:\n      'node-v' +\n      process.versions.modules +\n      '-' +\n      process.platform +\n      '-' +\n      process.arch,\n    version: process.versions.node,\n    bindings: 'bindings.node',\n    try: [\n      // node-gyp's linked version in the \"build\" dir\n      ['module_root', 'build', 'bindings'],\n      // node-waf and gyp_addon (a.k.a node-gyp)\n      ['module_root', 'build', 'Debug', 'bindings'],\n      ['module_root', 'build', 'Release', 'bindings'],\n      // Debug files, for development (legacy behavior, remove for node v0.9)\n      ['module_root', 'out', 'Debug', 'bindings'],\n      ['module_root', 'Debug', 'bindings'],\n      // Release files, but manually compiled (legacy behavior, remove for node v0.9)\n      ['module_root', 'out', 'Release', 'bindings'],\n      ['module_root', 'Release', 'bindings'],\n      // Legacy from node-waf, node <= 0.4.x\n      ['module_root', 'build', 'default', 'bindings'],\n      // Production \"Release\" buildtype binary (meh...)\n      ['module_root', 'compiled', 'version', 'platform', 'arch', 'bindings'],\n      // node-qbs builds\n      ['module_root', 'addon-build', 'release', 'install-root', 'bindings'],\n      ['module_root', 'addon-build', 'debug', 'install-root', 'bindings'],\n      ['module_root', 'addon-build', 'default', 'install-root', 'bindings'],\n      // node-pre-gyp path ./lib/binding/{node_abi}-{platform}-{arch}\n      ['module_root', 'lib', 'binding', 'nodePreGyp', 'bindings']\n    ]\n  };\n\n/**\n * The main `bindings()` function loads the compiled bindings for a given module.\n * It uses V8's Error API to determine the parent filename that this function is\n * being invoked from, which is then used to find the root directory.\n */\n\nfunction bindings(opts) {\n  // Argument surgery\n  if (typeof opts == 'string') {\n    opts = { bindings: opts };\n  } else if (!opts) {\n    opts = {};\n  }\n\n  // maps `defaults` onto `opts` object\n  Object.keys(defaults).map(function(i) {\n    if (!(i in opts)) opts[i] = defaults[i];\n  });\n\n  // Get the module root\n  if (!opts.module_root) {\n    opts.module_root = exports.getRoot(exports.getFileName());\n  }\n\n  // Ensure the given bindings name ends with .node\n  if (path.extname(opts.bindings) != '.node') {\n    opts.bindings += '.node';\n  }\n\n  // https://github.com/webpack/webpack/issues/4175#issuecomment-342931035\n  var requireFunc =\n    typeof __webpack_require__ === 'function'\n      ? __non_webpack_require__\n      : require;\n\n  var tries = [],\n    i = 0,\n    l = opts.try.length,\n    n,\n    b,\n    err;\n\n  for (; i < l; i++) {\n    n = join.apply(\n      null,\n      opts.try[i].map(function(p) {\n        return opts[p] || p;\n      })\n    );\n    tries.push(n);\n    try {\n      b = opts.path ? requireFunc.resolve(n) : requireFunc(n);\n      if (!opts.path) {\n        b.path = n;\n      }\n      return b;\n    } catch (e) {\n      if (e.code !== 'MODULE_NOT_FOUND' &&\n          e.code !== 'QUALIFIED_PATH_RESOLUTION_FAILED' &&\n          !/not find/i.test(e.message)) {\n        throw e;\n      }\n    }\n  }\n\n  err = new Error(\n    'Could not locate the bindings file. Tried:\\n' +\n      tries\n        .map(function(a) {\n          return opts.arrow + a;\n        })\n        .join('\\n')\n  );\n  err.tries = tries;\n  throw err;\n}\nmodule.exports = exports = bindings;\n\n/**\n * Gets the filename of the JavaScript file that invokes this function.\n * Used to help find the root directory of a module.\n * Optionally accepts an filename argument to skip when searching for the invoking filename\n */\n\nexports.getFileName = function getFileName(calling_file) {\n  var origPST = Error.prepareStackTrace,\n    origSTL = Error.stackTraceLimit,\n    dummy = {},\n    fileName;\n\n  Error.stackTraceLimit = 10;\n\n  Error.prepareStackTrace = function(e, st) {\n    for (var i = 0, l = st.length; i < l; i++) {\n      fileName = st[i].getFileName();\n      if (fileName !== __filename) {\n        if (calling_file) {\n          if (fileName !== calling_file) {\n            return;\n          }\n        } else {\n          return;\n        }\n      }\n    }\n  };\n\n  // run the 'prepareStackTrace' function above\n  Error.captureStackTrace(dummy);\n  dummy.stack;\n\n  // cleanup\n  Error.prepareStackTrace = origPST;\n  Error.stackTraceLimit = origSTL;\n\n  // handle filename that starts with \"file://\"\n  var fileSchema = 'file://';\n  if (fileName.indexOf(fileSchema) === 0) {\n    fileName = fileURLToPath(fileName);\n  }\n\n  return fileName;\n};\n\n/**\n * Gets the root directory of a module, given an arbitrary filename\n * somewhere in the module tree. The \"root directory\" is the directory\n * containing the `package.json` file.\n *\n *   In:  /home/nate/node-native-module/lib/index.js\n *   Out: /home/nate/node-native-module\n */\n\nexports.getRoot = function getRoot(file) {\n  var dir = dirname(file),\n    prev;\n  while (true) {\n    if (dir === '.') {\n      // Avoids an infinite loop in rare cases, like the REPL\n      dir = process.cwd();\n    }\n    if (\n      exists(join(dir, 'package.json')) ||\n      exists(join(dir, 'node_modules'))\n    ) {\n      // Found the 'package.json' file or 'node_modules' dir; we're done\n      return dir;\n    }\n    if (prev === dir) {\n      // Got to the top\n      throw new Error(\n        'Could not find module root given file: \"' +\n          file +\n          '\". Do you have a `package.json` file? '\n      );\n    }\n    // Try the parent dir next\n    prev = dir;\n    dir = join(dir, '..');\n  }\n};\n","'use strict';\n\nmodule.exports = (_ => {\n  const osType = require('os').type();\n\n  if (osType === 'Linux') {\n    return require('bindings')('epoll.node');\n  }\n\n  console.warn(`Warning: epoll is built for Linux and not intended for usage on ${osType}.`);\n\n  return {\n    Epoll: {}\n  };\n})();\n\n","'use strict';\n\nconst fs = require('fs');\nconst debounce = require('lodash.debounce');\nconst Epoll = require('epoll').Epoll;\n\nconst GPIO_ROOT_PATH = '/sys/class/gpio/';\n\nconst HIGH_BUF = Buffer.from('1');\nconst LOW_BUF = Buffer.from('0');\n\nconst HIGH = 1;\nconst LOW = 0;\n\nconst exportGpio = gpio => {\n  if (!fs.existsSync(gpio._gpioPath)) {\n    // The GPIO hasn't been exported yet so export it\n    fs.writeFileSync(GPIO_ROOT_PATH + 'export', '' + gpio._gpio);\n\n    return false;\n  }\n\n  // The GPIO has already been exported, perhaps by onoff itself, perhaps\n  // by quick2wire gpio-admin on the Pi, perhaps by the WiringPi gpio\n  // utility on the Pi, or perhaps by something else. In any case, an\n  // attempt is made to set the direction and edge to the requested\n  // values here. If quick2wire gpio-admin was used for the export, the\n  // user should have access to both direction and edge files. This is\n  // important as gpio-admin sets niether direction nor edge. If the\n  // WiringPi gpio utility was used, the user should have access to edge\n  // file, but not the direction file. This is also ok as the WiringPi\n  // gpio utility can set both direction and edge. If there are any\n  // errors while attempting to perform the modifications, just keep on\n  // truckin'.\n  return true;\n};\n\n// Avoid the access permission issue described here:\n// https://github.com/raspberrypi/linux/issues/553\n// On some syetems udev rules are used to set access permissions on the GPIO\n// sysfs files enabling those files to be accessed without root privileges.\n// This takes a while so wait for it to complete.\nconst waitForGpioAccessPermission = (\n  gpio, direction, edge, gpioPreviouslyExported\n) => {\n  let permissionRequiredPaths = [\n    gpio._gpioPath + 'value',\n  ];\n\n  if (gpioPreviouslyExported === false) {\n    permissionRequiredPaths.push(gpio._gpioPath + 'direction');\n    permissionRequiredPaths.push(gpio._gpioPath + 'active_low');\n\n    // On some systems the edge file will not exist if the GPIO does not\n    // support interrupts\n    // https://github.com/fivdi/onoff/issues/77#issuecomment-321980735\n    if (edge && direction === 'in') {\n      permissionRequiredPaths.push(gpio._gpioPath + 'edge');\n    }\n  }\n\n  permissionRequiredPaths.forEach(path => {\n    let tries = 0;\n\n    while (true) {\n      try {\n        tries += 1;\n        const fd = fs.openSync(path, 'r+');\n        fs.closeSync(fd);\n        break;\n      } catch (e) {\n        if (tries === 10000) {\n          throw e;\n        }\n      }\n    }\n  });\n};\n\nconst configureGpio = (\n  gpio, direction, edge, options, gpioPreviouslyExported\n) => {\n  const throwIfNeeded = err => {\n    if (gpioPreviouslyExported === false) {\n      throw err;\n    }\n  };\n\n  try {\n    if (typeof options.activeLow === 'boolean') {\n      gpio.setActiveLow(options.activeLow);\n    }\n  } catch (err) {\n    throwIfNeeded(err);\n  }\n\n  try {\n    const reconfigureDirection =\n      typeof options.reconfigureDirection === 'boolean' ?\n        options.reconfigureDirection : true;\n\n    const requestedDirection =\n      direction === 'high' || direction === 'low' ? 'out' : direction;\n\n    if (reconfigureDirection || gpio.direction() !== requestedDirection) {\n      gpio.setDirection(direction);\n    }\n  } catch (err) {\n    throwIfNeeded(err);\n  }\n\n  try {\n    // On some systems writing to the edge file for an output GPIO will\n    // result in an \"EIO, i/o error\"\n    // https://github.com/fivdi/onoff/issues/87\n    if (edge && direction === 'in') {\n      gpio.setEdge(edge);\n    }\n  } catch (err) {\n    throwIfNeeded(err);\n  }\n};\n\nconst configureInterruptHandler = gpio => {\n  // A poller is created for both inputs and outputs. A poller isn't\n  // actually needed for an output but the setDirection method can be\n  // invoked to change the direction of a GPIO from output to input and\n  // then a poller may be needed.\n  const pollerEventHandler = (err, fd, events) => {\n    const value = gpio.readSync();\n\n    if ((value === LOW && gpio._fallingEnabled) ||\n        (value === HIGH && gpio._risingEnabled)) {\n      gpio._listeners.slice(0).forEach(callback => {\n        callback(err, value);\n      });\n    }\n  };\n\n  // Read GPIO value before polling to prevent an initial unauthentic\n  // interrupt\n  gpio.readSync();\n\n  if (gpio._debounceTimeout > 0) {\n    const db = debounce(pollerEventHandler, gpio._debounceTimeout);\n\n    gpio._poller = new Epoll((err, fd, events) => {\n      gpio.readSync(); // Clear interrupt\n      db(err, fd, events);\n    });\n  } else {\n    gpio._poller = new Epoll(pollerEventHandler);\n  }\n};\n\nclass Gpio {\n  constructor(gpio, direction, edge, options) {\n    if (typeof edge === 'object' && !options) {\n      options = edge;\n      edge = undefined;\n    }\n\n    options = options || {};\n\n    this._gpio = gpio;\n    this._gpioPath = GPIO_ROOT_PATH + 'gpio' + this._gpio + '/';\n    this._debounceTimeout = options.debounceTimeout || 0;\n    this._readBuffer = Buffer.alloc(16);\n    this._readSyncBuffer = Buffer.alloc(16);\n    this._listeners = [];\n\n    const gpioPreviouslyExported = exportGpio(this);\n\n    waitForGpioAccessPermission(\n      this, direction, edge, gpioPreviouslyExported\n    );\n\n    configureGpio(this, direction, edge, options, gpioPreviouslyExported);\n\n    this._valueFd = fs.openSync(this._gpioPath + 'value', 'r+');\n\n    configureInterruptHandler(this);\n  }\n\n  read(callback) {\n    const readValue = callback => {\n      fs.read(this._valueFd, this._readBuffer, 0, 1, 0, (err, bytes, buf) => {\n        if (typeof callback === 'function') {\n          if (err) {\n            return callback(err);\n          }\n\n          callback(null, convertBufferToBit(buf));\n        }\n      });\n    };\n\n    if (callback) {\n      readValue(callback);\n    } else {\n      return new Promise((resolve, reject) => {\n        readValue((err, value) => {\n          if (err) {\n            reject(err);\n          } else {\n            resolve(value);\n          }\n        });\n      });\n    }\n  }\n\n  readSync() {\n    fs.readSync(this._valueFd, this._readSyncBuffer, 0, 1, 0);\n    return convertBufferToBit(this._readSyncBuffer);\n  }\n\n  write(value, callback) {\n    const writeValue = (value, callback) => {\n      const writeBuffer = convertBitToBuffer(value);\n      fs.write(\n        this._valueFd, writeBuffer, 0, writeBuffer.length, 0, callback\n      );\n    };\n\n    if (callback) {\n      writeValue(value, callback);\n    } else {\n      return new Promise((resolve, reject) => {\n        writeValue(value, err => {\n          if (err) {\n            reject(err);\n          } else {\n            resolve();\n          }\n        });\n      });\n    }\n  }\n\n  writeSync(value) {\n    const writeBuffer = convertBitToBuffer(value);\n    fs.writeSync(this._valueFd, writeBuffer, 0, writeBuffer.length, 0);\n  }\n\n  watch(callback) {\n    this._listeners.push(callback);\n\n    if (this._listeners.length === 1) {\n      this._poller.add(this._valueFd, Epoll.EPOLLPRI);\n    }\n  }\n\n  unwatch(callback) {\n    if (this._listeners.length > 0) {\n      if (typeof callback !== 'function') {\n        this._listeners = [];\n      } else {\n        this._listeners = this._listeners.filter(listener => {\n          return callback !== listener;\n        });\n      }\n\n      if (this._listeners.length === 0) {\n        this._poller.remove(this._valueFd);\n      }\n    }\n  }\n\n  unwatchAll() {\n    this.unwatch();\n  }\n\n  direction() {\n    return fs.readFileSync(this._gpioPath + 'direction').toString().trim();\n  }\n\n  setDirection(direction) {\n    fs.writeFileSync(this._gpioPath + 'direction', direction);\n  }\n\n  edge() {\n    return fs.readFileSync(this._gpioPath + 'edge').toString().trim();\n  }\n\n  setEdge(edge) {\n    fs.writeFileSync(this._gpioPath + 'edge', edge);\n\n    this._risingEnabled = edge === 'both' || edge === 'rising';\n    this._fallingEnabled = edge === 'both' || edge === 'falling';\n  }\n\n  activeLow() {\n    return convertBufferToBoolean(\n      fs.readFileSync(this._gpioPath + 'active_low')\n    );\n  }\n\n  setActiveLow(invert) {\n    fs.writeFileSync(\n      this._gpioPath + 'active_low', convertBooleanToBuffer(!!invert)\n    );\n  }\n\n  unexport() {\n    this.unwatchAll();\n    fs.closeSync(this._valueFd);\n    try {\n      fs.writeFileSync(GPIO_ROOT_PATH + 'unexport', '' + this._gpio);\n    } catch (ignore) {\n      // Flow of control always arrives here when cape_universal is enabled on\n      // the bbb.\n    }\n  }\n\n  static get accessible() {\n    let fd;\n\n    try {\n      fd = fs.openSync(GPIO_ROOT_PATH + 'export', fs.constants.O_WRONLY);\n    } catch(e) {\n      // e.code === 'ENOENT' / 'EACCES' are most common\n      // though any failure to open will also result in a gpio\n      // failure to export.\n      return false;\n    } finally {\n      if (fd) {\n        fs.closeSync(fd);\n      }\n    }\n\n    return true;\n  }\n}\n\nconst convertBitToBuffer = bit => convertBooleanToBuffer(bit === HIGH);\nconst convertBufferToBit =\n  buffer => convertBufferToBoolean(buffer) ? HIGH : LOW;\n\nconst convertBooleanToBuffer = boolean => boolean ? HIGH_BUF : LOW_BUF;\nconst convertBufferToBoolean = buffer => buffer[0] === HIGH_BUF[0];\n\nGpio.HIGH = HIGH;\nGpio.LOW = LOW;\n\nmodule.exports.Gpio = Gpio;\n\n","/**\n * GPIO Button Helper for Raspberry Pi\n * Requires: npm install onoff\n */\n\nlet Gpio: any = null;\n\n// Dynamic import for optional dependency\nasync function loadGpio(): Promise<any> {\n  try {\n    const onoffModule = await import('onoff');\n    return onoffModule.Gpio;\n  } catch (error) {\n    console.warn('onoff module not available, GPIO functionality will be mocked');\n    return null;\n  }\n}\n\ninterface GPIOButtonOptions {\n  pin: number;\n  edge?: 'rising' | 'falling' | 'both';\n  activeLow?: boolean;\n  debounceTimeout?: number;\n}\n\nexport class GPIOButtonHelper {\n  private gpio: any | null = null;\n  private isPressed: boolean = false;\n  private debounceTimer: NodeJS.Timeout | null = null;\n  private options: GPIOButtonOptions;\n\n  constructor(options: GPIOButtonOptions) {\n    this.options = {\n      edge: 'both',\n      activeLow: false,\n      debounceTimeout: 50,\n      ...options\n    };\n\n    this.initializeGPIO();\n  }\n\n  private async initializeGPIO(): Promise<void> {\n    try {\n      if (!Gpio) {\n        Gpio = await loadGpio();\n      }\n\n      if (!Gpio || !Gpio.accessible) {\n        console.warn('GPIO not accessible. Running in mock mode.');\n        return;\n      }\n\n      this.gpio = new Gpio(this.options.pin, 'in', this.options.edge, {\n        activeLow: this.options.activeLow || false\n      });\n\n      this.gpio.watch((err: any, value: number) => {\n        if (err) {\n          console.error('GPIO watch error:', err);\n          return;\n        }\n\n        this.handleButtonChange(value);\n      });\n\n      // Read initial state\n      this.isPressed = this.gpio.readSync() === 1;\n      \n    } catch (error) {\n      console.error('Failed to initialize GPIO:', error);\n      console.warn('Falling back to mock mode');\n    }\n  }\n\n  private handleButtonChange(value: number): void {\n    // Debounce button presses\n    if (this.debounceTimer) {\n      clearTimeout(this.debounceTimer);\n    }\n\n    this.debounceTimer = setTimeout(() => {\n      const wasPressed = this.isPressed;\n      this.isPressed = value === 1;\n\n      // Log state changes for debugging\n      if (wasPressed !== this.isPressed) {\n        console.log(`GPIO Pin ${this.options.pin}: ${this.isPressed ? 'PRESSED' : 'RELEASED'}`);\n      }\n    }, this.options.debounceTimeout);\n  }\n\n  public getState(): boolean {\n    if (this.gpio && Gpio && Gpio.accessible) {\n      try {\n        return this.gpio.readSync() === 1;\n      } catch (error) {\n        console.error('Error reading GPIO state:', error);\n        return this.isPressed;\n      }\n    }\n    \n    // Mock mode - return current state\n    return this.isPressed;\n  }\n\n  public isButtonPressed(): boolean {\n    return this.getState();\n  }\n\n  public cleanup(): void {\n    if (this.debounceTimer) {\n      clearTimeout(this.debounceTimer);\n    }\n\n    if (this.gpio) {\n      this.gpio.unexport();\n      this.gpio = null;\n    }\n  }\n\n  // Mock methods for testing without hardware\n  public mockPress(): void {\n    console.log(`Mock: Button ${this.options.pin} pressed`);\n    this.isPressed = true;\n  }\n\n  public mockRelease(): void {\n    console.log(`Mock: Button ${this.options.pin} released`);\n    this.isPressed = false;\n  }\n}\n\n// Factory function for creating GPIO availability triggers\nexport function createGPIOButtonTrigger(pin: number, options?: Partial<GPIOButtonOptions>): () => boolean {\n  const buttonHelper = new GPIOButtonHelper({ pin, ...options });\n\n  // Cleanup on process exit\n  process.on('SIGINT', () => buttonHelper.cleanup());\n  process.on('SIGTERM', () => buttonHelper.cleanup());\n\n  return () => buttonHelper.isButtonPressed();\n}\n\n// Alternative simpler interface\nexport function gpioButton(pin: number, activeLow: boolean = false): () => boolean {\n  return createGPIOButtonTrigger(pin, { activeLow });\n}"]}