From 0c07a36f162aaddd4d8b06c7e5e8cbf56bd48f77 Mon Sep 17 00:00:00 2001
From: Matt Lubner <matt@mattlubner.com>
Date: Wed, 22 Dec 2021 13:03:41 -0800
Subject: [PATCH 1/5] feat: replace GlobalScope with globalThis

---
 .eslintrc.json          |  3 ++-
 src/amplitude-client.js |  9 ++++-----
 src/base64.js           |  9 ++++-----
 src/config-manager.js   |  7 +++----
 src/cookiestorage.js    |  3 +--
 src/get-host.js         |  8 +++-----
 src/get-location.js     |  4 +---
 src/global-scope.js     |  2 --
 src/index.js            |  3 +--
 src/localstorage.js     | 15 +++++++--------
 src/metadata-storage.js | 11 +++++------
 src/utils.js            |  5 ++---
 src/xhr.js              |  5 ++---
 test/global-scope.js    |  7 -------
 test/tests.js           |  1 -
 15 files changed, 35 insertions(+), 57 deletions(-)
 delete mode 100644 src/global-scope.js
 delete mode 100644 test/global-scope.js

diff --git a/.eslintrc.json b/.eslintrc.json
index 618b7f0e..20190246 100644
--- a/.eslintrc.json
+++ b/.eslintrc.json
@@ -21,6 +21,7 @@
     "define": "readonly",
     "amplitude": "readonly",
     "opera": "readonly",
-    "ActiveXObject": "readonly"
+    "ActiveXObject": "readonly",
+    "globalThis": "readonly"
   }
 }
diff --git a/src/amplitude-client.js b/src/amplitude-client.js
index cda4ffc7..2c176f12 100644
--- a/src/amplitude-client.js
+++ b/src/amplitude-client.js
@@ -19,7 +19,6 @@ import getHost from './get-host';
 import baseCookie from './base-cookie';
 import { AmplitudeServerZone, getEventLogApi } from './server-zone';
 import ConfigManager from './config-manager';
-import GlobalScope from './global-scope';
 
 /**
  * AmplitudeClient SDK API - instance constructor.
@@ -83,7 +82,7 @@ AmplitudeClient.prototype.init = function init(apiKey, opt_userId, opt_config, o
     _parseConfig(this.options, opt_config);
     if (
       (isBrowserEnv() || utils.isWebWorkerEnvironment()) &&
-      GlobalScope.Prototype !== undefined &&
+      globalThis.Prototype !== undefined &&
       Array.prototype.toJSON
     ) {
       prototypeJsFix();
@@ -248,7 +247,7 @@ AmplitudeClient.prototype.init = function init(apiKey, opt_userId, opt_config, o
         // Monitoring just page exits because that is the most requested feature for now
         // "If you're specifically trying to detect page unload events, the pagehide event is the best option."
         // https://developer.mozilla.org/en-US/docs/Web/API/Window/pagehide_event
-        GlobalScope.addEventListener(
+        globalThis.addEventListener(
           'pagehide',
           () => {
             handleVisibilityChange();
@@ -763,7 +762,7 @@ AmplitudeClient.prototype._getReferrer = function _getReferrer() {
  * @private
  */
 AmplitudeClient.prototype._getUrlParams = function _getUrlParams() {
-  return GlobalScope.location.search;
+  return globalThis.location.search;
 };
 
 /**
@@ -1785,7 +1784,7 @@ AmplitudeClient.prototype.sendEvents = function sendEvents() {
     }
     this._sending = true;
   }
-  var protocol = this.options.forceHttps ? 'https' : 'https:' === GlobalScope.location.protocol ? 'https' : 'http';
+  var protocol = this.options.forceHttps ? 'https' : 'https:' === globalThis.location.protocol ? 'https' : 'http';
   var url = protocol + '://' + this.options.apiEndpoint;
 
   // fetch events to send
diff --git a/src/base64.js b/src/base64.js
index 4a085dfc..c10d3a08 100644
--- a/src/base64.js
+++ b/src/base64.js
@@ -1,5 +1,4 @@
 import UTF8 from './utf8';
-import GlobalScope from './global-scope';
 
 /*
  * Base64 encoder/decoder
@@ -10,8 +9,8 @@ var Base64 = {
 
   encode: function (input) {
     try {
-      if (GlobalScope.btoa && GlobalScope.atob) {
-        return GlobalScope.btoa(unescape(encodeURIComponent(input)));
+      if (globalThis.btoa && globalThis.atob) {
+        return globalThis.btoa(unescape(encodeURIComponent(input)));
       }
     } catch (e) {
       //log(e);
@@ -54,8 +53,8 @@ var Base64 = {
 
   decode: function (input) {
     try {
-      if (GlobalScope.btoa && GlobalScope.atob) {
-        return decodeURIComponent(escape(GlobalScope.atob(input)));
+      if (globalThis.btoa && globalThis.atob) {
+        return decodeURIComponent(escape(globalThis.atob(input)));
       }
     } catch (e) {
       //log(e);
diff --git a/src/config-manager.js b/src/config-manager.js
index 294133e2..e7946536 100644
--- a/src/config-manager.js
+++ b/src/config-manager.js
@@ -1,6 +1,5 @@
 import Constants from './constants';
 import { getDynamicConfigApi } from './server-zone';
-import GlobalScope from './global-scope';
 /**
  * Dynamic Configuration
  * Find the best server url automatically based on app users' geo location.
@@ -16,14 +15,14 @@ class ConfigManager {
 
   refresh(serverZone, forceHttps, callback) {
     let protocol = 'https';
-    if (!forceHttps && 'https:' !== GlobalScope.location.protocol) {
+    if (!forceHttps && 'https:' !== globalThis.location.protocol) {
       protocol = 'http';
     }
     const dynamicConfigUrl = protocol + '://' + getDynamicConfigApi(serverZone);
     const self = this;
-    const isIE = GlobalScope.XDomainRequest ? true : false;
+    const isIE = globalThis.XDomainRequest ? true : false;
     if (isIE) {
-      const xdr = new GlobalScope.XDomainRequest();
+      const xdr = new globalThis.XDomainRequest();
       xdr.open('GET', dynamicConfigUrl, true);
       xdr.onload = function () {
         const response = JSON.parse(xdr.responseText);
diff --git a/src/cookiestorage.js b/src/cookiestorage.js
index 367c4fea..1dae661e 100644
--- a/src/cookiestorage.js
+++ b/src/cookiestorage.js
@@ -6,7 +6,6 @@
 import Cookie from './cookie';
 import localStorage from './localstorage';
 import baseCookie from './base-cookie';
-import GlobalScope from './global-scope';
 
 var cookieStorage = function () {
   this.storage = null;
@@ -44,7 +43,7 @@ cookieStorage.prototype.getStorage = function () {
         this._options.expirationDays = opts.expirationDays || this._options.expirationDays;
         // localStorage is specific to subdomains
         this._options.domain =
-          opts.domain || this._options.domain || (GlobalScope && GlobalScope.location && GlobalScope.location.hostname);
+          opts.domain || this._options.domain || (globalThis && globalThis.location && globalThis.location.hostname);
         return (this._options.secure = opts.secure || false);
       },
       get: function (name) {
diff --git a/src/get-host.js b/src/get-host.js
index 8c717448..6c378030 100644
--- a/src/get-host.js
+++ b/src/get-host.js
@@ -1,18 +1,16 @@
-import GlobalScope from './global-scope';
-
 const getHost = (url) => {
   if (url) {
     if (typeof document !== 'undefined') {
       const a = document.createElement('a');
       a.href = url;
-      return a.hostname || GlobalScope.location.hostname;
+      return a.hostname || globalThis.location.hostname;
     }
     if (typeof URL === 'function') {
       const u = new URL(url);
-      return u.hostname || GlobalScope.location.hostname;
+      return u.hostname || globalThis.location.hostname;
     }
   }
-  return GlobalScope.location.hostname;
+  return globalThis.location.hostname;
 };
 
 export default getHost;
diff --git a/src/get-location.js b/src/get-location.js
index ad8ba3d4..1f78ccbd 100644
--- a/src/get-location.js
+++ b/src/get-location.js
@@ -1,7 +1,5 @@
-import GlobalScope from './global-scope';
-
 const getLocation = () => {
-  return GlobalScope.location;
+  return globalThis.location;
 };
 
 export default getLocation;
diff --git a/src/global-scope.js b/src/global-scope.js
deleted file mode 100644
index f7aadec0..00000000
--- a/src/global-scope.js
+++ /dev/null
@@ -1,2 +0,0 @@
-const GlobalScope = typeof window !== 'undefined' ? window : self;
-export default GlobalScope;
diff --git a/src/index.js b/src/index.js
index 591a6ff4..c2b26249 100644
--- a/src/index.js
+++ b/src/index.js
@@ -1,8 +1,7 @@
 // Entry point
 import Amplitude from './amplitude';
-import GlobalScope from './global-scope';
 
-const old = (typeof GlobalScope !== 'undefined' && GlobalScope.amplitude) || {};
+const old = (typeof globalThis !== 'undefined' && globalThis.amplitude) || {};
 const newInstance = new Amplitude();
 newInstance._q = old._q || [];
 
diff --git a/src/localstorage.js b/src/localstorage.js
index 53a2828d..cfe0d5f6 100644
--- a/src/localstorage.js
+++ b/src/localstorage.js
@@ -2,14 +2,13 @@
  * Implement localStorage to support Firefox 2-3 and IE 5-7
  */
 
-import GlobalScope from './global-scope';
 import WorkerStorage from './worker-storage';
 import utils from './utils';
 
 var localStorage;
 
 if (!BUILD_COMPAT_LOCAL_STORAGE) {
-  localStorage = GlobalScope.localStorage;
+  localStorage = globalThis.localStorage;
 }
 
 if (BUILD_COMPAT_LOCAL_STORAGE) {
@@ -18,9 +17,9 @@ if (BUILD_COMPAT_LOCAL_STORAGE) {
     var uid = new Date();
     var result;
     try {
-      GlobalScope.localStorage.setItem(uid, uid);
-      result = GlobalScope.localStorage.getItem(uid) === String(uid);
-      GlobalScope.localStorage.removeItem(uid);
+      globalThis.localStorage.setItem(uid, uid);
+      result = globalThis.localStorage.getItem(uid) === String(uid);
+      globalThis.localStorage.removeItem(uid);
       return result;
     } catch (e) {
       // localStorage not available
@@ -29,12 +28,12 @@ if (BUILD_COMPAT_LOCAL_STORAGE) {
   };
 
   if (windowLocalStorageAvailable()) {
-    localStorage = GlobalScope.localStorage;
-  } else if (typeof GlobalScope !== 'undefined' && GlobalScope.globalStorage) {
+    localStorage = globalThis.localStorage;
+  } else if (typeof globalThis !== 'undefined' && globalThis.globalStorage) {
     // Firefox 2-3 use globalStorage
     // See https://developer.mozilla.org/en/dom/storage#globalStorage
     try {
-      localStorage = GlobalScope.globalStorage[GlobalScope.location.hostname];
+      localStorage = globalThis.globalStorage[globalThis.location.hostname];
     } catch (e) {
       // Something bad happened...
     }
diff --git a/src/metadata-storage.js b/src/metadata-storage.js
index c719a992..d044cdc9 100644
--- a/src/metadata-storage.js
+++ b/src/metadata-storage.js
@@ -10,7 +10,6 @@ import getLocation from './get-location';
 import ampLocalStorage from './localstorage';
 import topDomain from './top-domain';
 import utils from './utils';
-import GlobalScope from './global-scope';
 
 const storageOptionExists = {
   [Constants.STORAGE_COOKIES]: true,
@@ -89,8 +88,8 @@ class MetadataStorage {
 
     switch (this.storage) {
       case Constants.STORAGE_SESSION:
-        if (GlobalScope.sessionStorage) {
-          GlobalScope.sessionStorage.setItem(this.storageKey, value);
+        if (globalThis.sessionStorage) {
+          globalThis.sessionStorage.setItem(this.storageKey, value);
         }
         break;
       case Constants.STORAGE_LOCAL:
@@ -132,7 +131,7 @@ class MetadataStorage {
     }
     if (!str) {
       try {
-        str = GlobalScope.sessionStorage && GlobalScope.sessionStorage.getItem(this.storageKey);
+        str = globalThis.sessionStorage && globalThis.sessionStorage.getItem(this.storageKey);
       } catch (e) {
         utils.log.info(`window.sessionStorage unavailable. Reason: "${e}"`);
       }
@@ -188,8 +187,8 @@ class MetadataStorage {
     }
     if (!str) {
       try {
-        str = GlobalScope.sessionStorage && GlobalScope.sessionStorage.getItem(this.storageKey);
-        GlobalScope.sessionStorage.clear();
+        str = globalThis.sessionStorage && globalThis.sessionStorage.getItem(this.storageKey);
+        globalThis.sessionStorage.clear();
       } catch (e) {
         utils.log.info(`window.sessionStorage unavailable. Reason: "${e}"`);
       }
diff --git a/src/utils.js b/src/utils.js
index a163576e..6a744e1f 100644
--- a/src/utils.js
+++ b/src/utils.js
@@ -1,5 +1,4 @@
 import constants from './constants';
-import GlobalScope from './global-scope';
 import type from './type';
 
 var logLevels = {
@@ -55,7 +54,7 @@ var isEmptyString = function isEmptyString(str) {
 
 var sessionStorageEnabled = function sessionStorageEnabled() {
   try {
-    if (GlobalScope.sessionStorage) {
+    if (globalThis.sessionStorage) {
       return true;
     }
   } catch (e) {
@@ -275,7 +274,7 @@ var getQueryParam = function getQueryParam(name, query) {
 };
 
 const isWebWorkerEnvironment = () => {
-  return typeof WorkerGlobalScope !== 'undefined';
+  return typeof WorkerglobalThis !== 'undefined';
 };
 
 export default {
diff --git a/src/xhr.js b/src/xhr.js
index 8a532314..a2c3136a 100644
--- a/src/xhr.js
+++ b/src/xhr.js
@@ -1,5 +1,4 @@
 import queryString from 'query-string';
-import GlobalScope from './global-scope';
 
 /*
  * Simple AJAX request object
@@ -17,9 +16,9 @@ function setHeaders(xhr, headers) {
 }
 
 Request.prototype.send = function (callback) {
-  var isIE = GlobalScope.XDomainRequest ? true : false;
+  var isIE = globalThis.XDomainRequest ? true : false;
   if (isIE) {
-    var xdr = new GlobalScope.XDomainRequest();
+    var xdr = new globalThis.XDomainRequest();
     xdr.open('POST', this.url, true);
     xdr.onload = function () {
       callback(200, xdr.responseText);
diff --git a/test/global-scope.js b/test/global-scope.js
deleted file mode 100644
index 4906f590..00000000
--- a/test/global-scope.js
+++ /dev/null
@@ -1,7 +0,0 @@
-import GlobalScope from '../src/global-scope';
-
-describe('GlobalScope', function () {
-  it('should return true', function () {
-    assert.isTrue(GlobalScope === window);
-  });
-});
diff --git a/test/tests.js b/test/tests.js
index 4d48df49..c85df27f 100644
--- a/test/tests.js
+++ b/test/tests.js
@@ -17,4 +17,3 @@ import './base64Id.js';
 import './server-zone.js';
 import './config-manager.js';
 import './worker-storage.js';
-import './global-scope.js';

From e27925c85a213b752a48ccd71ae32f47e5c101b2 Mon Sep 17 00:00:00 2001
From: Matt Lubner <matt@mattlubner.com>
Date: Wed, 22 Dec 2021 13:14:17 -0800
Subject: [PATCH 2/5] fix: restore WorkerGlobalScope

---
 src/utils.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/utils.js b/src/utils.js
index 6a744e1f..2555e8c5 100644
--- a/src/utils.js
+++ b/src/utils.js
@@ -274,7 +274,7 @@ var getQueryParam = function getQueryParam(name, query) {
 };
 
 const isWebWorkerEnvironment = () => {
-  return typeof WorkerglobalThis !== 'undefined';
+  return typeof WorkerGlobalScope !== 'undefined';
 };
 
 export default {

From 155dcbcc83ba71c05e3645aaee7554461bfc0796 Mon Sep 17 00:00:00 2001
From: Matt Lubner <matt@mattlubner.com>
Date: Wed, 22 Dec 2021 16:16:47 -0800
Subject: [PATCH 3/5] Revert "fix: restore WorkerGlobalScope"

This reverts commit e27925c85a213b752a48ccd71ae32f47e5c101b2.
---
 src/utils.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/utils.js b/src/utils.js
index 2555e8c5..6a744e1f 100644
--- a/src/utils.js
+++ b/src/utils.js
@@ -274,7 +274,7 @@ var getQueryParam = function getQueryParam(name, query) {
 };
 
 const isWebWorkerEnvironment = () => {
-  return typeof WorkerGlobalScope !== 'undefined';
+  return typeof WorkerglobalThis !== 'undefined';
 };
 
 export default {

From 7d631fa97e573039b7bb9053c704c03f8fa3663d Mon Sep 17 00:00:00 2001
From: Matt Lubner <matt@mattlubner.com>
Date: Wed, 22 Dec 2021 16:16:51 -0800
Subject: [PATCH 4/5] Revert "feat: replace GlobalScope with globalThis"

This reverts commit 0c07a36f162aaddd4d8b06c7e5e8cbf56bd48f77.
---
 .eslintrc.json          |  3 +--
 src/amplitude-client.js |  9 +++++----
 src/base64.js           |  9 +++++----
 src/config-manager.js   |  7 ++++---
 src/cookiestorage.js    |  3 ++-
 src/get-host.js         |  8 +++++---
 src/get-location.js     |  4 +++-
 src/global-scope.js     |  2 ++
 src/index.js            |  3 ++-
 src/localstorage.js     | 15 ++++++++-------
 src/metadata-storage.js | 11 ++++++-----
 src/utils.js            |  5 +++--
 src/xhr.js              |  5 +++--
 test/global-scope.js    |  7 +++++++
 test/tests.js           |  1 +
 15 files changed, 57 insertions(+), 35 deletions(-)
 create mode 100644 src/global-scope.js
 create mode 100644 test/global-scope.js

diff --git a/.eslintrc.json b/.eslintrc.json
index 20190246..618b7f0e 100644
--- a/.eslintrc.json
+++ b/.eslintrc.json
@@ -21,7 +21,6 @@
     "define": "readonly",
     "amplitude": "readonly",
     "opera": "readonly",
-    "ActiveXObject": "readonly",
-    "globalThis": "readonly"
+    "ActiveXObject": "readonly"
   }
 }
diff --git a/src/amplitude-client.js b/src/amplitude-client.js
index 2c176f12..cda4ffc7 100644
--- a/src/amplitude-client.js
+++ b/src/amplitude-client.js
@@ -19,6 +19,7 @@ import getHost from './get-host';
 import baseCookie from './base-cookie';
 import { AmplitudeServerZone, getEventLogApi } from './server-zone';
 import ConfigManager from './config-manager';
+import GlobalScope from './global-scope';
 
 /**
  * AmplitudeClient SDK API - instance constructor.
@@ -82,7 +83,7 @@ AmplitudeClient.prototype.init = function init(apiKey, opt_userId, opt_config, o
     _parseConfig(this.options, opt_config);
     if (
       (isBrowserEnv() || utils.isWebWorkerEnvironment()) &&
-      globalThis.Prototype !== undefined &&
+      GlobalScope.Prototype !== undefined &&
       Array.prototype.toJSON
     ) {
       prototypeJsFix();
@@ -247,7 +248,7 @@ AmplitudeClient.prototype.init = function init(apiKey, opt_userId, opt_config, o
         // Monitoring just page exits because that is the most requested feature for now
         // "If you're specifically trying to detect page unload events, the pagehide event is the best option."
         // https://developer.mozilla.org/en-US/docs/Web/API/Window/pagehide_event
-        globalThis.addEventListener(
+        GlobalScope.addEventListener(
           'pagehide',
           () => {
             handleVisibilityChange();
@@ -762,7 +763,7 @@ AmplitudeClient.prototype._getReferrer = function _getReferrer() {
  * @private
  */
 AmplitudeClient.prototype._getUrlParams = function _getUrlParams() {
-  return globalThis.location.search;
+  return GlobalScope.location.search;
 };
 
 /**
@@ -1784,7 +1785,7 @@ AmplitudeClient.prototype.sendEvents = function sendEvents() {
     }
     this._sending = true;
   }
-  var protocol = this.options.forceHttps ? 'https' : 'https:' === globalThis.location.protocol ? 'https' : 'http';
+  var protocol = this.options.forceHttps ? 'https' : 'https:' === GlobalScope.location.protocol ? 'https' : 'http';
   var url = protocol + '://' + this.options.apiEndpoint;
 
   // fetch events to send
diff --git a/src/base64.js b/src/base64.js
index c10d3a08..4a085dfc 100644
--- a/src/base64.js
+++ b/src/base64.js
@@ -1,4 +1,5 @@
 import UTF8 from './utf8';
+import GlobalScope from './global-scope';
 
 /*
  * Base64 encoder/decoder
@@ -9,8 +10,8 @@ var Base64 = {
 
   encode: function (input) {
     try {
-      if (globalThis.btoa && globalThis.atob) {
-        return globalThis.btoa(unescape(encodeURIComponent(input)));
+      if (GlobalScope.btoa && GlobalScope.atob) {
+        return GlobalScope.btoa(unescape(encodeURIComponent(input)));
       }
     } catch (e) {
       //log(e);
@@ -53,8 +54,8 @@ var Base64 = {
 
   decode: function (input) {
     try {
-      if (globalThis.btoa && globalThis.atob) {
-        return decodeURIComponent(escape(globalThis.atob(input)));
+      if (GlobalScope.btoa && GlobalScope.atob) {
+        return decodeURIComponent(escape(GlobalScope.atob(input)));
       }
     } catch (e) {
       //log(e);
diff --git a/src/config-manager.js b/src/config-manager.js
index e7946536..294133e2 100644
--- a/src/config-manager.js
+++ b/src/config-manager.js
@@ -1,5 +1,6 @@
 import Constants from './constants';
 import { getDynamicConfigApi } from './server-zone';
+import GlobalScope from './global-scope';
 /**
  * Dynamic Configuration
  * Find the best server url automatically based on app users' geo location.
@@ -15,14 +16,14 @@ class ConfigManager {
 
   refresh(serverZone, forceHttps, callback) {
     let protocol = 'https';
-    if (!forceHttps && 'https:' !== globalThis.location.protocol) {
+    if (!forceHttps && 'https:' !== GlobalScope.location.protocol) {
       protocol = 'http';
     }
     const dynamicConfigUrl = protocol + '://' + getDynamicConfigApi(serverZone);
     const self = this;
-    const isIE = globalThis.XDomainRequest ? true : false;
+    const isIE = GlobalScope.XDomainRequest ? true : false;
     if (isIE) {
-      const xdr = new globalThis.XDomainRequest();
+      const xdr = new GlobalScope.XDomainRequest();
       xdr.open('GET', dynamicConfigUrl, true);
       xdr.onload = function () {
         const response = JSON.parse(xdr.responseText);
diff --git a/src/cookiestorage.js b/src/cookiestorage.js
index 1dae661e..367c4fea 100644
--- a/src/cookiestorage.js
+++ b/src/cookiestorage.js
@@ -6,6 +6,7 @@
 import Cookie from './cookie';
 import localStorage from './localstorage';
 import baseCookie from './base-cookie';
+import GlobalScope from './global-scope';
 
 var cookieStorage = function () {
   this.storage = null;
@@ -43,7 +44,7 @@ cookieStorage.prototype.getStorage = function () {
         this._options.expirationDays = opts.expirationDays || this._options.expirationDays;
         // localStorage is specific to subdomains
         this._options.domain =
-          opts.domain || this._options.domain || (globalThis && globalThis.location && globalThis.location.hostname);
+          opts.domain || this._options.domain || (GlobalScope && GlobalScope.location && GlobalScope.location.hostname);
         return (this._options.secure = opts.secure || false);
       },
       get: function (name) {
diff --git a/src/get-host.js b/src/get-host.js
index 6c378030..8c717448 100644
--- a/src/get-host.js
+++ b/src/get-host.js
@@ -1,16 +1,18 @@
+import GlobalScope from './global-scope';
+
 const getHost = (url) => {
   if (url) {
     if (typeof document !== 'undefined') {
       const a = document.createElement('a');
       a.href = url;
-      return a.hostname || globalThis.location.hostname;
+      return a.hostname || GlobalScope.location.hostname;
     }
     if (typeof URL === 'function') {
       const u = new URL(url);
-      return u.hostname || globalThis.location.hostname;
+      return u.hostname || GlobalScope.location.hostname;
     }
   }
-  return globalThis.location.hostname;
+  return GlobalScope.location.hostname;
 };
 
 export default getHost;
diff --git a/src/get-location.js b/src/get-location.js
index 1f78ccbd..ad8ba3d4 100644
--- a/src/get-location.js
+++ b/src/get-location.js
@@ -1,5 +1,7 @@
+import GlobalScope from './global-scope';
+
 const getLocation = () => {
-  return globalThis.location;
+  return GlobalScope.location;
 };
 
 export default getLocation;
diff --git a/src/global-scope.js b/src/global-scope.js
new file mode 100644
index 00000000..f7aadec0
--- /dev/null
+++ b/src/global-scope.js
@@ -0,0 +1,2 @@
+const GlobalScope = typeof window !== 'undefined' ? window : self;
+export default GlobalScope;
diff --git a/src/index.js b/src/index.js
index c2b26249..591a6ff4 100644
--- a/src/index.js
+++ b/src/index.js
@@ -1,7 +1,8 @@
 // Entry point
 import Amplitude from './amplitude';
+import GlobalScope from './global-scope';
 
-const old = (typeof globalThis !== 'undefined' && globalThis.amplitude) || {};
+const old = (typeof GlobalScope !== 'undefined' && GlobalScope.amplitude) || {};
 const newInstance = new Amplitude();
 newInstance._q = old._q || [];
 
diff --git a/src/localstorage.js b/src/localstorage.js
index cfe0d5f6..53a2828d 100644
--- a/src/localstorage.js
+++ b/src/localstorage.js
@@ -2,13 +2,14 @@
  * Implement localStorage to support Firefox 2-3 and IE 5-7
  */
 
+import GlobalScope from './global-scope';
 import WorkerStorage from './worker-storage';
 import utils from './utils';
 
 var localStorage;
 
 if (!BUILD_COMPAT_LOCAL_STORAGE) {
-  localStorage = globalThis.localStorage;
+  localStorage = GlobalScope.localStorage;
 }
 
 if (BUILD_COMPAT_LOCAL_STORAGE) {
@@ -17,9 +18,9 @@ if (BUILD_COMPAT_LOCAL_STORAGE) {
     var uid = new Date();
     var result;
     try {
-      globalThis.localStorage.setItem(uid, uid);
-      result = globalThis.localStorage.getItem(uid) === String(uid);
-      globalThis.localStorage.removeItem(uid);
+      GlobalScope.localStorage.setItem(uid, uid);
+      result = GlobalScope.localStorage.getItem(uid) === String(uid);
+      GlobalScope.localStorage.removeItem(uid);
       return result;
     } catch (e) {
       // localStorage not available
@@ -28,12 +29,12 @@ if (BUILD_COMPAT_LOCAL_STORAGE) {
   };
 
   if (windowLocalStorageAvailable()) {
-    localStorage = globalThis.localStorage;
-  } else if (typeof globalThis !== 'undefined' && globalThis.globalStorage) {
+    localStorage = GlobalScope.localStorage;
+  } else if (typeof GlobalScope !== 'undefined' && GlobalScope.globalStorage) {
     // Firefox 2-3 use globalStorage
     // See https://developer.mozilla.org/en/dom/storage#globalStorage
     try {
-      localStorage = globalThis.globalStorage[globalThis.location.hostname];
+      localStorage = GlobalScope.globalStorage[GlobalScope.location.hostname];
     } catch (e) {
       // Something bad happened...
     }
diff --git a/src/metadata-storage.js b/src/metadata-storage.js
index d044cdc9..c719a992 100644
--- a/src/metadata-storage.js
+++ b/src/metadata-storage.js
@@ -10,6 +10,7 @@ import getLocation from './get-location';
 import ampLocalStorage from './localstorage';
 import topDomain from './top-domain';
 import utils from './utils';
+import GlobalScope from './global-scope';
 
 const storageOptionExists = {
   [Constants.STORAGE_COOKIES]: true,
@@ -88,8 +89,8 @@ class MetadataStorage {
 
     switch (this.storage) {
       case Constants.STORAGE_SESSION:
-        if (globalThis.sessionStorage) {
-          globalThis.sessionStorage.setItem(this.storageKey, value);
+        if (GlobalScope.sessionStorage) {
+          GlobalScope.sessionStorage.setItem(this.storageKey, value);
         }
         break;
       case Constants.STORAGE_LOCAL:
@@ -131,7 +132,7 @@ class MetadataStorage {
     }
     if (!str) {
       try {
-        str = globalThis.sessionStorage && globalThis.sessionStorage.getItem(this.storageKey);
+        str = GlobalScope.sessionStorage && GlobalScope.sessionStorage.getItem(this.storageKey);
       } catch (e) {
         utils.log.info(`window.sessionStorage unavailable. Reason: "${e}"`);
       }
@@ -187,8 +188,8 @@ class MetadataStorage {
     }
     if (!str) {
       try {
-        str = globalThis.sessionStorage && globalThis.sessionStorage.getItem(this.storageKey);
-        globalThis.sessionStorage.clear();
+        str = GlobalScope.sessionStorage && GlobalScope.sessionStorage.getItem(this.storageKey);
+        GlobalScope.sessionStorage.clear();
       } catch (e) {
         utils.log.info(`window.sessionStorage unavailable. Reason: "${e}"`);
       }
diff --git a/src/utils.js b/src/utils.js
index 6a744e1f..a163576e 100644
--- a/src/utils.js
+++ b/src/utils.js
@@ -1,4 +1,5 @@
 import constants from './constants';
+import GlobalScope from './global-scope';
 import type from './type';
 
 var logLevels = {
@@ -54,7 +55,7 @@ var isEmptyString = function isEmptyString(str) {
 
 var sessionStorageEnabled = function sessionStorageEnabled() {
   try {
-    if (globalThis.sessionStorage) {
+    if (GlobalScope.sessionStorage) {
       return true;
     }
   } catch (e) {
@@ -274,7 +275,7 @@ var getQueryParam = function getQueryParam(name, query) {
 };
 
 const isWebWorkerEnvironment = () => {
-  return typeof WorkerglobalThis !== 'undefined';
+  return typeof WorkerGlobalScope !== 'undefined';
 };
 
 export default {
diff --git a/src/xhr.js b/src/xhr.js
index a2c3136a..8a532314 100644
--- a/src/xhr.js
+++ b/src/xhr.js
@@ -1,4 +1,5 @@
 import queryString from 'query-string';
+import GlobalScope from './global-scope';
 
 /*
  * Simple AJAX request object
@@ -16,9 +17,9 @@ function setHeaders(xhr, headers) {
 }
 
 Request.prototype.send = function (callback) {
-  var isIE = globalThis.XDomainRequest ? true : false;
+  var isIE = GlobalScope.XDomainRequest ? true : false;
   if (isIE) {
-    var xdr = new globalThis.XDomainRequest();
+    var xdr = new GlobalScope.XDomainRequest();
     xdr.open('POST', this.url, true);
     xdr.onload = function () {
       callback(200, xdr.responseText);
diff --git a/test/global-scope.js b/test/global-scope.js
new file mode 100644
index 00000000..4906f590
--- /dev/null
+++ b/test/global-scope.js
@@ -0,0 +1,7 @@
+import GlobalScope from '../src/global-scope';
+
+describe('GlobalScope', function () {
+  it('should return true', function () {
+    assert.isTrue(GlobalScope === window);
+  });
+});
diff --git a/test/tests.js b/test/tests.js
index c85df27f..4d48df49 100644
--- a/test/tests.js
+++ b/test/tests.js
@@ -17,3 +17,4 @@ import './base64Id.js';
 import './server-zone.js';
 import './config-manager.js';
 import './worker-storage.js';
+import './global-scope.js';

From 910b1688a55b86a369d4ba4598481a22848aefb4 Mon Sep 17 00:00:00 2001
From: Matt Lubner <matt@mattlubner.com>
Date: Wed, 22 Dec 2021 16:27:13 -0800
Subject: [PATCH 5/5] fix: global-scope reference error in nodejs

---
 src/global-scope.js | 17 ++++++++++++++++-
 1 file changed, 16 insertions(+), 1 deletion(-)

diff --git a/src/global-scope.js b/src/global-scope.js
index f7aadec0..efa9efc5 100644
--- a/src/global-scope.js
+++ b/src/global-scope.js
@@ -1,2 +1,17 @@
-const GlobalScope = typeof window !== 'undefined' ? window : self;
+/* global globalThis */
+const GlobalScope = (() => {
+  if (typeof globalThis !== 'undefined') {
+    return globalThis;
+  }
+  if (typeof window !== 'undefined') {
+    return window;
+  }
+  if (typeof self !== 'undefined') {
+    return self;
+  }
+  if (typeof global !== 'undefined') {
+    return global;
+  }
+})();
+
 export default GlobalScope;