extension-instance.js

const apis = [
  'alarms',
  'bookmarks',
  'browserAction',
  'commands',
  'contextMenus',
  'cookies',
  'downloads',
  'events',
  'extension',
  'extensionTypes',
  'history',
  'i18n',
  'idle',
  'notifications',
  'pageAction',
  'runtime',
  'storage',
  'tabs',
  'webNavigation',
  'webRequest',
  'windows',
]

const hasChrome = typeof chrome !== 'undefined'
const hasWindow = typeof window !== 'undefined'
const hasBrowser = typeof browser !== 'undefined'

function Extension () {
  const _this = this

  apis.forEach(function (api) {

    _this[api] = null

    if (hasChrome) {
      try {
        if (chrome[api]) {
          _this[api] = chrome[api]
        }
      } catch (e) {
      }
    }

    if (hasWindow) {
      try {
        if (window[api]) {
          _this[api] = window[api]
        }
      } catch (e) {
      }
    }

    if (hasBrowser) {
      try {
        if (browser[api]) {
          _this[api] = browser[api]
        }
      } catch (e) {
      }
      try {
        _this.api = browser.extension[api]
      } catch (e) {
      }
    }
  })

  if (hasBrowser) {
    try {
      if (browser && browser.runtime) {
        this.runtime = browser.runtime
      }
    } catch (e) {
    }

    try {
      if (browser && browser.browserAction) {
        this.browserAction = browser.browserAction
      }
    } catch (e) {
    }
  }

}

module.exports = Extension