ssap_app/node_modules/react-native-device-info/lib/module/web/index.js

import { NativeEventEmitter, NativeModules } from 'react-native';
const deviceInfoEmitter = new NativeEventEmitter(NativeModules.RNDeviceInfo);
let batteryCharging = false,
    batteryLevel = -1,
    powerState = {};

const _readPowerState = battery => {
  const {
    level,
    charging,
    chargingtime,
    dischargingtime
  } = battery;
  return {
    batteryLevel: level,
    lowPowerMode: false,
    batteryState: level === 1 ? 'full' : charging ? 'charging' : 'unplugged',
    chargingtime,
    dischargingtime
  };
};

export const getMaxMemorySync = () => {
  if (window.performance && window.performance.memory) {
    return window.performance.memory.jsHeapSizeLimit;
  }

  return -1;
};
export const getInstallReferrerSync = () => {
  return document.referrer;
};
export const isAirplaneModeSync = () => {
  return !!navigator.onLine;
};
export const getUserAgentSync = () => {
  return window.navigator.userAgent;
};
export const isLocationEnabledSync = () => {
  return !!navigator.geolocation;
};
export const getTotalMemorySync = () => {
  if (navigator.deviceMemory) {
    return navigator.deviceMemory * 1000000000;
  }

  return -1;
};
export const getUsedMemorySync = () => {
  if (window.performance && window.performance.memory) {
    return window.performance.memory.usedJSHeapSize;
  }

  return -1;
};

const init = () => {
  if (typeof navigator === 'undefined' || !navigator.getBattery) return;
  navigator.getBattery().then(battery => {
    batteryCharging = battery.charging;
    battery.addEventListener('chargingchange', () => {
      const {
        charging
      } = battery;
      batteryCharging = charging;
      powerState = _readPowerState(battery);
      deviceInfoEmitter.emit('RNDeviceInfo_powerStateDidChange', powerState);
    });
    battery.addEventListener('levelchange', () => {
      const {
        level
      } = battery;
      batteryLevel = level;
      powerState = _readPowerState(battery);
      deviceInfoEmitter.emit('RNDeviceInfo_batteryLevelDidChange', level);

      if (level < 0.2) {
        deviceInfoEmitter.emit('RNDeviceInfo_batteryLevelIsLow', level);
      }
    });
  });
};

const getBaseOsSync = () => {
  const userAgent = window.navigator.userAgent,
        platform = window.navigator.platform,
        macosPlatforms = ['Macintosh', 'MacIntel', 'MacPPC', 'Mac68K'],
        windowsPlatforms = ['Win32', 'Win64', 'Windows', 'WinCE'],
        iosPlatforms = ['iPhone', 'iPad', 'iPod'];
  let os = platform;

  if (macosPlatforms.indexOf(platform) !== -1) {
    os = 'Mac OS';
  } else if (iosPlatforms.indexOf(platform) !== -1) {
    os = 'iOS';
  } else if (windowsPlatforms.indexOf(platform) !== -1) {
    os = 'Windows';
  } else if (/Android/.test(userAgent)) {
    os = 'Android';
  } else if (!os && /Linux/.test(platform)) {
    os = 'Linux';
  }

  return os;
};

init();
/**
 * react-native-web empty polyfill.
 */

export const getInstallReferrer = async () => {
  return getInstallReferrerSync();
};
export const getUserAgent = async () => {
  return getUserAgentSync();
};
export const isBatteryCharging = async () => {
  if (navigator.getBattery) {
    return navigator.getBattery().then(battery => battery.charging);
  }

  return false;
};
export const isBatteryChargingSync = () => {
  return batteryCharging;
};
export const isCameraPresent = async () => {
  if (navigator.mediaDevices && navigator.mediaDevices.enumerateDevices) {
    return navigator.mediaDevices.enumerateDevices().then(devices => {
      return !!devices.find(d => d.kind === 'videoinput');
    });
  }

  return false;
};
export const isCameraPresentSync = () => {
  console.log('[react-native-device-info] isCameraPresentSync not supported - please use isCameraPresent');
  return false;
};
export const getBatteryLevel = async () => {
  if (navigator.getBattery) {
    return navigator.getBattery().then(battery => battery.level);
  }

  return -1;
};
export const getBatteryLevelSync = () => {
  return batteryLevel;
};
export const isLocationEnabled = async () => {
  return isLocationEnabledSync();
};
export const isAirplaneMode = async () => {
  return isAirplaneModeSync();
};
export const getBaseOs = async () => {
  return getBaseOsSync();
};
export const getTotalDiskCapacity = async () => {
  if (navigator.storage && navigator.storage.estimate) {
    return navigator.storage.estimate().then(({
      quota
    }) => quota);
  }

  return -1;
};
export const getTotalDiskCapacitySync = () => {
  console.log('[react-native-device-info] getTotalDiskCapacitySync not supported - please use getTotalDiskCapacity');
  return -1;
};
export const getFreeDiskStorage = async () => {
  if (navigator.storage && navigator.storage.estimate) {
    return navigator.storage.estimate().then(({
      quota,
      usage
    }) => quota - usage);
  }

  return -1;
};
export const getFreeDiskStorageSync = () => {
  console.log('[react-native-device-info] getFreeDiskStorageSync not supported - please use getFreeDiskStorage');
  return -1;
};
export const getMaxMemory = async () => {
  return getMaxMemorySync();
};
export const getUsedMemory = async () => {
  return getUsedMemorySync();
};
export const getTotalMemory = async () => {
  return getTotalMemorySync();
};
export const getPowerState = async () => {
  if (navigator.getBattery) {
    return navigator.getBattery().then(battery => _readPowerState(battery));
  }

  return {};
};
export const getPowerStateSync = () => {
  return powerState;
};
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