diff --git a/.github/workflows/ci-cd.yml b/.github/workflows/ci-cd.yml
index f6fd86ccb..7b5cb50ea 100644
--- a/.github/workflows/ci-cd.yml
+++ b/.github/workflows/ci-cd.yml
@@ -50,6 +50,9 @@ jobs:
       - name: npm Build
         run: BUILD_BRANCH=$(echo "${GITHUB_REF#refs/heads/}") BUILD_COMMIT=${{ github.sha }} npm run build
 
+      - name: npm Build GaToSplit auto-require script
+        run: npm run build:ga-to-split-autorequire
+
       - name: Configure AWS credentials (development)
         if: ${{ github.event_name == 'push' && github.ref == 'refs/heads/development' }}
         uses: aws-actions/configure-aws-credentials@v1
diff --git a/CHANGES.txt b/CHANGES.txt
index 9b549227d..e8c60d6c6 100644
--- a/CHANGES.txt
+++ b/CHANGES.txt
@@ -1,3 +1,10 @@
+10.21.0 (July 22, 2022)
+- Added `autoRequire` configuration option to the Google Analytics to Split integration, which takes care of requiring the splitTracker plugin on trackers dynamically created by Google tag managers (See https://help.split.io/hc/en-us/articles/360040838752#set-up-with-gtm-and-gtag.js).
+- Updated browser listener to push remaining impressions and events on 'visibilitychange' and 'pagehide' DOM events, instead of 'unload', which is not reliable in modern mobile and desktop Web browsers.
+- Updated the synchronization flow to be more reliable in the event of an edge case generating delay in cache purge propagation, keeping the SDK cache properly synced.
+- Updated some dependencies for vulnerability fixes.
+- Bugfixing - Moved js-yaml dependency from @splitsoftware/splitio-commons to avoid resolution to an incompatible version on certain npm versions when installing third-party dependencies that also define js-yaml as transitive dependency (Related to issue https://github.com/splitio/javascript-client/issues/662).
+
 10.20.0 (June 29, 2022)
 - Added a new config option to control the tasks that listen or poll for updates on feature flags and segments, via the new config sync.enabled . Running online Split will always pull the most recent updates upon initialization, this only affects updates fetching on a running instance. Useful when a consistent session experience is a must or to save resources when updates are not being used.
 - Updated telemetry logic to track the anonymous config for user consent flag set to declined or unknown.
diff --git a/package-lock.json b/package-lock.json
index bb6095050..2e16e0cb9 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "@splitsoftware/splitio",
-  "version": "10.20.0",
+  "version": "10.21.0",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
@@ -389,6 +389,55 @@
       "integrity": "sha512-wdppn25U8z/2yiaT6YGquE6X8sSv7hNMWSXYSSU1jGv/yd6XqjXgTDJ8KP4NgjTXfJ3GbRjeeb8RTV7a/VpM+w==",
       "dev": true
     },
+    "@jridgewell/gen-mapping": {
+      "version": "0.3.2",
+      "resolved": "https://registry.npmjs.org/@jridgewell/gen-mapping/-/gen-mapping-0.3.2.tgz",
+      "integrity": "sha512-mh65xKQAzI6iBcFzwv28KVWSmCkdRBWoOh+bYQGW3+6OZvbbN3TqMGo5hqYxQniRcH9F2VZIoJCm4pa3BPDK/A==",
+      "dev": true,
+      "requires": {
+        "@jridgewell/set-array": "^1.0.1",
+        "@jridgewell/sourcemap-codec": "^1.4.10",
+        "@jridgewell/trace-mapping": "^0.3.9"
+      }
+    },
+    "@jridgewell/resolve-uri": {
+      "version": "3.1.0",
+      "resolved": "https://registry.npmjs.org/@jridgewell/resolve-uri/-/resolve-uri-3.1.0.tgz",
+      "integrity": "sha512-F2msla3tad+Mfht5cJq7LSXcdudKTWCVYUgw6pLFOOHSTtZlj6SWNYAp+AhuqLmWdBO2X5hPrLcu8cVP8fy28w==",
+      "dev": true
+    },
+    "@jridgewell/set-array": {
+      "version": "1.1.2",
+      "resolved": "https://registry.npmjs.org/@jridgewell/set-array/-/set-array-1.1.2.tgz",
+      "integrity": "sha512-xnkseuNADM0gt2bs+BvhO0p78Mk762YnZdsuzFV018NoG1Sj1SCQvpSqa7XUaTam5vAGasABV9qXASMKnFMwMw==",
+      "dev": true
+    },
+    "@jridgewell/source-map": {
+      "version": "0.3.2",
+      "resolved": "https://registry.npmjs.org/@jridgewell/source-map/-/source-map-0.3.2.tgz",
+      "integrity": "sha512-m7O9o2uR8k2ObDysZYzdfhb08VuEml5oWGiosa1VdaPZ/A6QyPkAJuwN0Q1lhULOf6B7MtQmHENS743hWtCrgw==",
+      "dev": true,
+      "requires": {
+        "@jridgewell/gen-mapping": "^0.3.0",
+        "@jridgewell/trace-mapping": "^0.3.9"
+      }
+    },
+    "@jridgewell/sourcemap-codec": {
+      "version": "1.4.14",
+      "resolved": "https://registry.npmjs.org/@jridgewell/sourcemap-codec/-/sourcemap-codec-1.4.14.tgz",
+      "integrity": "sha512-XPSJHWmi394fuUuzDnGz1wiKqWfo1yXecHQMRf2l6hztTO+nPru658AyDngaBe7isIxEkRsPR3FZh+s7iVa4Uw==",
+      "dev": true
+    },
+    "@jridgewell/trace-mapping": {
+      "version": "0.3.14",
+      "resolved": "https://registry.npmjs.org/@jridgewell/trace-mapping/-/trace-mapping-0.3.14.tgz",
+      "integrity": "sha512-bJWEfQ9lPTvm3SneWwRFVLzrh6nhjwqw7TUFFBEMzwvg7t7PCDenf2lDwqo4NQXzdpgBXyFgDWnQA+2vkruksQ==",
+      "dev": true,
+      "requires": {
+        "@jridgewell/resolve-uri": "^3.0.3",
+        "@jridgewell/sourcemap-codec": "^1.4.10"
+      }
+    },
     "@mdn/browser-compat-data": {
       "version": "3.3.14",
       "resolved": "https://registry.npmjs.org/@mdn/browser-compat-data/-/browser-compat-data-3.3.14.tgz",
@@ -437,9 +486,9 @@
       "dev": true
     },
     "@splitsoftware/splitio-commons": {
-      "version": "1.5.0",
-      "resolved": "https://registry.npmjs.org/@splitsoftware/splitio-commons/-/splitio-commons-1.5.0.tgz",
-      "integrity": "sha512-7vBv4Yn+EKaAxJ+9RdKOqJNee+izj6BieG0ZmivWk8fTpKFpcvqKes/Y0kXk0tfOiMmUFV9dRr2xDHRYIf0lnw==",
+      "version": "1.6.1",
+      "resolved": "https://registry.npmjs.org/@splitsoftware/splitio-commons/-/splitio-commons-1.6.1.tgz",
+      "integrity": "sha512-lijSMpX5a7HiphPnzr7fKlicGSd5TeBWX5URLPWfL87SPlO+8iF7S7PNFPg8GMu+44CdRrp4REHPJo97ht6ePQ==",
       "requires": {
         "tslib": "^2.3.1"
       }
@@ -1911,7 +1960,7 @@
     "custom-event": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/custom-event/-/custom-event-1.0.1.tgz",
-      "integrity": "sha1-XQKkaFCt8bSjF5RqOSj8y1v9BCU=",
+      "integrity": "sha512-GAj5FOq0Hd+RsCGVJxZuKaIDXDf3h6GQoNEjFgbLLI/trgtavwUbSnZ5pVfg27DVCaWjIohryS0JFwIJyT2cMg==",
       "dev": true
     },
     "date-format": {
@@ -1992,7 +2041,7 @@
     "di": {
       "version": "0.0.1",
       "resolved": "https://registry.npmjs.org/di/-/di-0.0.1.tgz",
-      "integrity": "sha1-gGZJMmzqp8qjMG112YXqJ0i6kTw=",
+      "integrity": "sha512-uJaamHkagcZtHPqCIHZxnFrXlunQXgBOsZSUOWwFw31QJCAbyTBoHMW75YOTur5ZNx8pIeAKgf6GWIgaqqiLhA==",
       "dev": true
     },
     "diff": {
@@ -2032,7 +2081,7 @@
     "dom-serialize": {
       "version": "2.2.1",
       "resolved": "https://registry.npmjs.org/dom-serialize/-/dom-serialize-2.2.1.tgz",
-      "integrity": "sha1-ViromZ9Evl6jB29UGdzVnrQ6yVs=",
+      "integrity": "sha512-Yra4DbvoW7/Z6LBN560ZwXMjoNOSAN2wRsKFGc4iBeso+mpIA6qj1vfdf9HpMaKAqG6wXTy+1SYEzmNpKXOSsQ==",
       "dev": true,
       "requires": {
         "custom-event": "~1.0.0",
@@ -2071,7 +2120,7 @@
     "ee-first": {
       "version": "1.1.1",
       "resolved": "https://registry.npmjs.org/ee-first/-/ee-first-1.1.1.tgz",
-      "integrity": "sha1-WQxhFWsK4vTwJVcyoViyZrxWsh0=",
+      "integrity": "sha512-WMwm9LhRUo+WUaRN+vRuETqG89IgZphVSNkdFgeb6sS/E4OrDIN7t48CAewSHXc6C8lefD8KKfr5vY61brQlow==",
       "dev": true
     },
     "electron-to-chromium": {
@@ -2106,7 +2155,7 @@
     "encodeurl": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/encodeurl/-/encodeurl-1.0.2.tgz",
-      "integrity": "sha1-rT/0yG7C0CkyL1oCw6mmBslbP1k=",
+      "integrity": "sha512-TPJXq8JqFaVYm2CWmPvnP2Iyo4ZSM7/QKcSmuMLDObfpH5fi7RUGmd/rTDf+rut/saiDiQEeVTNgAmJEdAOx0w==",
       "dev": true
     },
     "end-of-stream": {
@@ -2183,7 +2232,7 @@
     "ent": {
       "version": "2.2.0",
       "resolved": "https://registry.npmjs.org/ent/-/ent-2.2.0.tgz",
-      "integrity": "sha1-6WQhkyWiHQX0RGai9obtbOX13R0=",
+      "integrity": "sha512-GHrMyVZQWvTIdDtpiEXdHZnFQKzeO09apj8Cbl4pKWy4i0Oprcq17usfDt5aO63swf0JOeMWjWQE/LzgSRuWpA==",
       "dev": true
     },
     "envinfo": {
@@ -2260,7 +2309,7 @@
     "escape-html": {
       "version": "1.0.3",
       "resolved": "https://registry.npmjs.org/escape-html/-/escape-html-1.0.3.tgz",
-      "integrity": "sha1-Aljq5NPQwJdN4cFpGI7wBR0dGYg=",
+      "integrity": "sha512-NiSupZ4OeuGwr68lGIeym/ksIZMJodUGOSCZ/FSnTxcrekbvqrgdUxlJOMpijaKZVjAJrWrGs/6Jy8OMuyj9ow==",
       "dev": true
     },
     "escape-string-regexp": {
@@ -4037,7 +4086,7 @@
     "lodash.defaults": {
       "version": "4.2.0",
       "resolved": "https://registry.npmjs.org/lodash.defaults/-/lodash.defaults-4.2.0.tgz",
-      "integrity": "sha1-0JF4cW/+pN3p5ft7N/bwgCJ0WAw="
+      "integrity": "sha512-qjxPLHd3r5DnsdGacqOMU6pb/avJzdh9tFX2ymgoZE27BmjXrNy/y4LoaiTeAb+O3gL8AfpJGtqfX/ae2leYYQ=="
     },
     "lodash.flatten": {
       "version": "4.4.0",
@@ -4053,7 +4102,7 @@
     "lodash.isarguments": {
       "version": "3.1.0",
       "resolved": "https://registry.npmjs.org/lodash.isarguments/-/lodash.isarguments-3.1.0.tgz",
-      "integrity": "sha1-L1c9hcaiQon/AGY7SRwdM4/zRYo="
+      "integrity": "sha512-chi4NHZlZqZD18a0imDHnZPrDeBbTtVN7GXMwuGdRH9qotxAjYs3aVLKc7zNOG9eddR5Ksd8rvFEBc9SsggPpg=="
     },
     "lodash.isequal": {
       "version": "4.5.0",
@@ -4146,7 +4195,7 @@
     "media-typer": {
       "version": "0.3.0",
       "resolved": "https://registry.npmjs.org/media-typer/-/media-typer-0.3.0.tgz",
-      "integrity": "sha1-hxDXrwqmJvj/+hzgAWhUUmMlV0g=",
+      "integrity": "sha512-dq+qelQ9akHpcOl/gUVRTxVIOkAJ1wR3QAvb4RsVjS8oVoFjDGTc679wJYmUmknUF5HwMLOgb5O+a3KxfWapPQ==",
       "dev": true
     },
     "merge-descriptors": {
@@ -4524,7 +4573,7 @@
     "object-assign": {
       "version": "4.1.1",
       "resolved": "https://registry.npmjs.org/object-assign/-/object-assign-4.1.1.tgz",
-      "integrity": "sha1-IQmtx5ZYh8/AXLvUQsrIv7s2CGM=",
+      "integrity": "sha512-rJgTQnkUnH1sFw8yT6VSU3zD3sWmu6sZhIseY8VX+GRu3P6F7Fu+JNDoXfklElbLJSnc3FUQHVe4cU5hj+BcUg==",
       "dev": true
     },
     "object-inspect": {
@@ -5230,7 +5279,7 @@
     "requires-port": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/requires-port/-/requires-port-1.0.0.tgz",
-      "integrity": "sha1-kl0mAdOaxIXgkc8NpcbmlNw9yv8=",
+      "integrity": "sha512-KigOCHcocU3XODJxsu8i/j8T9tzT4adHiecwORRQ0ZZFcp7ahwXuRU1m+yuO90C5ZUyGeGfocHDI14M3L3yDAQ==",
       "dev": true
     },
     "resolve": {
@@ -5522,6 +5571,24 @@
       "integrity": "sha1-igOdLRAh0i0eoUyA2OpGi6LvP8w=",
       "dev": true
     },
+    "source-map-support": {
+      "version": "0.5.21",
+      "resolved": "https://registry.npmjs.org/source-map-support/-/source-map-support-0.5.21.tgz",
+      "integrity": "sha512-uBHU3L3czsIyYXKX88fdrGovxdSCoTGDRZ6SYXtSRxLZUzHg5P/66Ht6uoUlHu9EZod+inXhKo3qQgwXUT/y1w==",
+      "dev": true,
+      "requires": {
+        "buffer-from": "^1.0.0",
+        "source-map": "^0.6.0"
+      },
+      "dependencies": {
+        "source-map": {
+          "version": "0.6.1",
+          "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.6.1.tgz",
+          "integrity": "sha512-UjgapumWlbMhkBgzT7Ykc5YXUT46F0iKu8SGXq0bcwP5dz/h0Plj6enJqjz1Zbq2l5WaqYnrVbwWOWMyF3F47g==",
+          "dev": true
+        }
+      }
+    },
     "sprintf-js": {
       "version": "1.0.3",
       "resolved": "https://registry.npmjs.org/sprintf-js/-/sprintf-js-1.0.3.tgz",
@@ -5892,40 +5959,15 @@
       }
     },
     "terser": {
-      "version": "5.9.0",
-      "resolved": "https://registry.npmjs.org/terser/-/terser-5.9.0.tgz",
-      "integrity": "sha512-h5hxa23sCdpzcye/7b8YqbE5OwKca/ni0RQz1uRX3tGh8haaGHqcuSqbGRybuAKNdntZ0mDgFNXPJ48xQ2RXKQ==",
+      "version": "5.14.2",
+      "resolved": "https://registry.npmjs.org/terser/-/terser-5.14.2.tgz",
+      "integrity": "sha512-oL0rGeM/WFQCUd0y2QrWxYnq7tfSuKBiqTjRPWrRgB46WD/kiwHwF8T23z78H6Q6kGCuuHcPB+KULHRdxvVGQA==",
       "dev": true,
       "requires": {
+        "@jridgewell/source-map": "^0.3.2",
+        "acorn": "^8.5.0",
         "commander": "^2.20.0",
-        "source-map": "~0.7.2",
         "source-map-support": "~0.5.20"
-      },
-      "dependencies": {
-        "source-map": {
-          "version": "0.7.3",
-          "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.7.3.tgz",
-          "integrity": "sha512-CkCj6giN3S+n9qrYiBTX5gystlENnRW5jZeNLHpe6aue+SrHcG5VYwujhW9s4dY31mEGsxBDrHR6oI69fTXsaQ==",
-          "dev": true
-        },
-        "source-map-support": {
-          "version": "0.5.20",
-          "resolved": "https://registry.npmjs.org/source-map-support/-/source-map-support-0.5.20.tgz",
-          "integrity": "sha512-n1lZZ8Ve4ksRqizaBQgxXDgKwttHDhyfQjA6YZZn8+AroHbsIz+JjwxQDxbp+7y5OYCI8t1Yk7etjD9CRd2hIw==",
-          "dev": true,
-          "requires": {
-            "buffer-from": "^1.0.0",
-            "source-map": "^0.6.0"
-          },
-          "dependencies": {
-            "source-map": {
-              "version": "0.6.1",
-              "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.6.1.tgz",
-              "integrity": "sha512-UjgapumWlbMhkBgzT7Ykc5YXUT46F0iKu8SGXq0bcwP5dz/h0Plj6enJqjz1Zbq2l5WaqYnrVbwWOWMyF3F47g==",
-              "dev": true
-            }
-          }
-        }
       }
     },
     "terser-webpack-plugin": {
@@ -6234,7 +6276,7 @@
     "unpipe": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/unpipe/-/unpipe-1.0.0.tgz",
-      "integrity": "sha1-sr9O6FFKrmFltIF4KdIbLvSZBOw=",
+      "integrity": "sha512-pjy2bYhSsufwWlKwPc+l3cN7+wuJlK6uz0YdJEOlQDbl6jo/YlPi4mb8agUkVC8BF7V8NuzeyPNqRksA3hztKQ==",
       "dev": true
     },
     "untildify": {
@@ -6299,7 +6341,7 @@
     "utils-merge": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/utils-merge/-/utils-merge-1.0.1.tgz",
-      "integrity": "sha1-n5VxD1CiZ5R7LMwSR0HBAoQn5xM=",
+      "integrity": "sha512-pMZTvIkT1d+TFGvDOqodOclx0QWkkgi6Tdoa8gC8ffGAAqz9pzPTZWAybbsHHoED/ztMtkv/VoYTYyShUn81hA==",
       "dev": true
     },
     "v8-compile-cache": {
@@ -6317,7 +6359,7 @@
     "vary": {
       "version": "1.1.2",
       "resolved": "https://registry.npmjs.org/vary/-/vary-1.1.2.tgz",
-      "integrity": "sha1-IpnwLG3tMNSllhsLn3RSShj2NPw=",
+      "integrity": "sha512-BNGbWLfd0eUPabhkXUVm0j8uuvREyTh5ovRa/dyow/BqAbZJyC+5fU+IzQOzmAKzYqYRAISoRhdQr3eIZ/PXqg==",
       "dev": true
     },
     "vm-browserify": {
@@ -6329,7 +6371,7 @@
     "void-elements": {
       "version": "2.0.1",
       "resolved": "https://registry.npmjs.org/void-elements/-/void-elements-2.0.1.tgz",
-      "integrity": "sha1-wGavtYK7HLQSjWDqkjkulNXp2+w=",
+      "integrity": "sha512-qZKX4RnBzH2ugr8Lxa7x+0V6XD9Sb/ouARtiasEQCHB1EVU4NXtmHsDDrx1dO4ne5fc3J6EW05BP1Dl0z0iung==",
       "dev": true
     },
     "watchpack": {
diff --git a/package.json b/package.json
index 815066319..fbe315e14 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@splitsoftware/splitio",
-  "version": "10.20.0",
+  "version": "10.21.0",
   "description": "Split SDK",
   "files": [
     "README.md",
@@ -10,7 +10,8 @@
     "lib",
     "types",
     "es",
-    "src"
+    "src",
+    "scripts/ga-to-split-autorequire.js"
   ],
   "repository": "splitio/javascript-client",
   "homepage": "https://github.com/splitio/javascript-client#readme",
@@ -32,11 +33,11 @@
     "node": ">=6"
   },
   "dependencies": {
-    "@splitsoftware/splitio-commons": "1.5.0",
+    "@splitsoftware/splitio-commons": "1.6.1",
     "@types/google.analytics": "0.0.40",
     "@types/ioredis": "^4.28.0",
     "ioredis": "^4.28.0",
-    "js-yaml": "3.13.1",
+    "js-yaml": "^3.13.1",
     "node-fetch": "^2.6.7",
     "unfetch": "^4.2.0"
   },
@@ -83,6 +84,7 @@
     "postbuild-cjs": "cross-env NODE_ENV=cjs node scripts/copy.packages.json.js && ./scripts/build_cjs_replace_imports.sh",
     "build-umd": "webpack --config webpack.dev.js --env branch=$BUILD_BRANCH --env commit_hash=$BUILD_COMMIT && webpack --config webpack.prod.js --env branch=$BUILD_BRANCH --env commit_hash=$BUILD_COMMIT && ./scripts/clean_umd_build.sh",
     "build:npm": "rimraf lib es && npm run build-cjs && npm run build-esm",
+    "build:ga-to-split-autorequire": "terser ./node_modules/@splitsoftware/splitio-commons/src/integrations/ga/autoRequire.js --mangle --output ./scripts/ga-to-split-autorequire.js && cp ./scripts/ga-to-split-autorequire.js umd/ga-to-split-autorequire.js",
     "build": "rimraf lib umd es && npm run build-cjs && npm run build-esm && npm run build-umd",
     "check": "npm run check:lint && npm run check:version",
     "check:lint": "eslint src",
diff --git a/scripts/ga-to-split-autorequire.js b/scripts/ga-to-split-autorequire.js
new file mode 100644
index 000000000..7f8b88597
--- /dev/null
+++ b/scripts/ga-to-split-autorequire.js
@@ -0,0 +1 @@
+(function(n,t,e){n[e]=n[e]||t;n[t]=n[t]||function(){n[t].q.push(arguments)};n[t].q=n[t].q||[];var r={};function i(n){return typeof n==="object"&&typeof n.name==="string"&&n.name}function o(e){if(e&&e[0]==="create"){var o=i(e[1])||i(e[2])||i(e[3])||(typeof e[3]==="string"?e[3]:undefined);if(!r[o]){r[o]=true;n[t]((o?o+".":"")+"require","splitTracker")}}}n[t].q.forEach(o);var u=n[t].q.push;n[t].q.push=function(n){var t=u.apply(this,arguments);o(n);return t}})(window,"ga","GoogleAnalyticsObject");
\ No newline at end of file
diff --git a/src/__tests__/browser.spec.js b/src/__tests__/browser.spec.js
index 254ff0fc7..2c396b437 100644
--- a/src/__tests__/browser.spec.js
+++ b/src/__tests__/browser.spec.js
@@ -8,10 +8,7 @@ import telemetrySuite from './browserSuites/telemetry.spec';
 import impressionsListenerSuite from './browserSuites/impressions-listener.spec';
 import readinessSuite from './browserSuites/readiness.spec';
 import readyFromCache from './browserSuites/ready-from-cache.spec';
-import {
-  withoutBindingTT,
-  bindingTT
-} from './browserSuites/events.spec';
+import { withoutBindingTT, bindingTT } from './browserSuites/events.spec';
 import sharedInstantiationSuite from './browserSuites/shared-instantiation.spec';
 import managerSuite from './browserSuites/manager.spec';
 import ignoreIpAddressesSettingSuite from './browserSuites/ignore-ip-addresses-setting.spec';
@@ -84,7 +81,7 @@ const configInLocalStorage = {
   streamingEnabled: false
 };
 
-tape('## E2E CI Tests ##', function(assert) {
+tape('## E2E CI Tests ##', function (assert) {
   //If we change the mocks, we need to clear localstorage. Cleaning up after testing ensures "fresh data".
   localStorage.clear();
 
@@ -96,6 +93,7 @@ tape('## E2E CI Tests ##', function(assert) {
   fetchMock.get(url(settings, '/mySegments/emmanuel%40split.io'), { status: 200, body: mySegmentsEmmanuel });
   fetchMock.post(url(settings, '/testImpressions/bulk'), 200);
   fetchMock.post(url(settings, '/testImpressions/count'), 200);
+  Math.random = () => 0.5; // SDKs without telemetry
 
   /* Check client evaluations. */
   assert.test('E2E / In Memory', evaluationsSuite.bind(null, configInMemory, fetchMock));
@@ -122,9 +120,9 @@ tape('## E2E CI Tests ##', function(assert) {
   assert.test('E2E / Readiness', readinessSuite.bind(null, fetchMock));
   /* Validate headers for ip and hostname are not sended with requests (ignore setting IPAddressesEnabled) */
   assert.test('E2E / Ignore setting IPAddressesEnabled', ignoreIpAddressesSettingSuite.bind(null, fetchMock));
-  /* Check that impressions and events are sended to backend via Beacon API or Fetch when page unload is triggered. */
-  assert.test('E2E / Use Beacon API (or Fetch if not available) to send remaining impressions and events when browser page is unload', useBeaconApiSuite.bind(null, fetchMock));
-  assert.test('E2E / Use Beacon API DEBUG (or Fetch if not available) to send remaining impressions and events when browser page is unload', useBeaconDebugApiSuite.bind(null, fetchMock));
+  /* Check that impressions and events are sended to backend via Beacon API or Fetch when pagehide/visibilitychange events are triggered. */
+  assert.test('E2E / Use Beacon API (or Fetch if not available) to send remaining impressions and events when browser page is unload or hidden', useBeaconApiSuite.bind(null, fetchMock));
+  assert.test('E2E / Use Beacon API DEBUG (or Fetch if not available) to send remaining impressions and events when browser page is unload or hidden', useBeaconDebugApiSuite.bind(null, fetchMock));
   /* Validate ready from cache behaviour (might be merged into another suite if we end up having simple behavior around it as expected) */
   assert.test('E2E / Readiness from cache', readyFromCache.bind(null, fetchMock));
   /* Validate readiness with ready promises */
diff --git a/src/__tests__/browserSuites/impressions.debug.spec.js b/src/__tests__/browserSuites/impressions.debug.spec.js
index a4b182dce..bbccfc9db 100644
--- a/src/__tests__/browserSuites/impressions.debug.spec.js
+++ b/src/__tests__/browserSuites/impressions.debug.spec.js
@@ -7,8 +7,8 @@ import { DEBUG } from '@splitsoftware/splitio-commons/src/utils/constants';
 import { url } from '../testUtils';
 
 const baseUrls = {
-  sdk: 'https://sdk.baseurl/impressionsSuite',
-  events: 'https://events.baseurl/impressionsSuite'
+  sdk: 'https://sdk.baseurl/impressionsDebugSuite',
+  events: 'https://events.baseurl/impressionsDebugSuite'
 };
 
 const settings = settingsFactory({
@@ -83,12 +83,12 @@ export default function (fetchMock, assert) {
     assert.equal(req.headers.SplitSDKImpressionsMode, DEBUG);
     assertPayload(req);
 
-    client.destroy();
-    assert.end();
+    client.destroy().then(() => {
+      assert.end();
+    });
 
     return 200;
   });
-  fetchMock.postOnce(url(settings, '/testImpressions/bulk'), 200);
 
   client.ready().then(() => {
     client.getTreatment('split_with_config');
diff --git a/src/__tests__/browserSuites/impressions.spec.js b/src/__tests__/browserSuites/impressions.spec.js
index e5ebb5092..8e73c5df2 100644
--- a/src/__tests__/browserSuites/impressions.spec.js
+++ b/src/__tests__/browserSuites/impressions.spec.js
@@ -84,12 +84,12 @@ export default function (fetchMock, assert) {
     assert.comment('We do one retry, so after a failed impressions post we will try once more.');
     assertPayload(req);
 
-    client.destroy();
-    assert.end();
+    client.destroy().then(() => {
+      assert.end();
+    });
 
     return 200;
   });
-  fetchMock.postOnce(url(settings, '/testImpressions/bulk'), 200);
 
   fetchMock.postOnce(url(settings, '/testImpressions/count'), (url, opts) => {
     const data = JSON.parse(opts.body);
@@ -109,7 +109,6 @@ export default function (fetchMock, assert) {
 
     return 200;
   });
-  fetchMock.postOnce(url(settings, '/testImpressions/count'), 200);
 
   client.ready().then(() => {
     truncatedTimeFrame = truncateTimeFrame(Date.now());
diff --git a/src/__tests__/browserSuites/push-synchronization-retries.spec.js b/src/__tests__/browserSuites/push-synchronization-retries.spec.js
index 5839264e3..03c79554f 100644
--- a/src/__tests__/browserSuites/push-synchronization-retries.spec.js
+++ b/src/__tests__/browserSuites/push-synchronization-retries.spec.js
@@ -76,9 +76,8 @@ const MILLIS_THIRD_RETRY_FOR_SPLIT_KILL_EVENT = 2000;
  *    (we destroy the client here, to assert that all scheduled tasks are clean)
  */
 export function testSynchronizationRetries(fetchMock, assert) {
-  // we update the backoff default base, to reduce the time of the test
-  const ORIGINAL_DEFAULT_BASE_MILLIS = Backoff.DEFAULT_BASE_MILLIS;
-  Backoff.DEFAULT_BASE_MILLIS = 100;
+  // Force the backoff base of UpdateWorkers, from 10 secs to 100 ms, to reduce test time
+  Backoff.__TEST__BASE_MILLIS = 100;
 
   assert.plan(17);
   fetchMock.reset();
@@ -196,7 +195,7 @@ export function testSynchronizationRetries(fetchMock, assert) {
     setTimeout(() => {
       Promise.all([otherClientSync.destroy(), client.destroy()]).then(() => {
         assert.equal(client.getTreatment('whitelist'), 'control', 'evaluation returns control if client is destroyed');
-        Backoff.DEFAULT_BASE_MILLIS = ORIGINAL_DEFAULT_BASE_MILLIS;
+        Backoff.__TEST__BASE_MILLIS = undefined;
         assert.end();
       });
     });
diff --git a/src/__tests__/browserSuites/use-beacon-api.debug.spec.js b/src/__tests__/browserSuites/use-beacon-api.debug.spec.js
index 4615f1cd0..9d604b494 100644
--- a/src/__tests__/browserSuites/use-beacon-api.debug.spec.js
+++ b/src/__tests__/browserSuites/use-beacon-api.debug.spec.js
@@ -5,7 +5,7 @@ import splitChangesMock1 from '../mocks/splitchanges.since.-1.json';
 import mySegmentsFacundo from '../mocks/mysegments.facundo@split.io.json';
 import { DEBUG } from '@splitsoftware/splitio-commons/src/utils/constants';
 import { url } from '../testUtils';
-import { triggerUnloadEvent } from '../testUtils/browser';
+import { triggerPagehideEvent, triggerVisibilitychange } from '../testUtils/browser';
 
 const config = {
   core: {
@@ -61,7 +61,7 @@ const assertCallsToBeaconAPI = (assert) => {
   assertEventSent(assert, parsedPayload.entries[0]);
 };
 
-// This E2E test checks that Beacon API is not called when page unload is triggered and there are not events or impressions to send.
+// This E2E test checks that Beacon API is not called when page is hidden and there are not events or impressions to send.
 function beaconApiNotSendTestDebug(fetchMock, assert) {
   sendBeaconSpyDebug = sinon.spy(window.navigator, 'sendBeacon');
 
@@ -75,8 +75,9 @@ function beaconApiNotSendTestDebug(fetchMock, assert) {
   const client = splitio.client();
   client.on(client.Event.SDK_READY, () => {
 
-    // trigger unload event, without tracked events and impressions
-    triggerUnloadEvent();
+    // trigger events, without tracked events and impressions
+    triggerPagehideEvent();
+    triggerVisibilitychange();
 
     // destroy the client and execute the next E2E test named beaconApiSendTest
     setTimeout(() => {
@@ -90,7 +91,7 @@ function beaconApiNotSendTestDebug(fetchMock, assert) {
   });
 }
 
-// This E2E test checks that impressions and events are sent to backend via Beacon API when page unload is triggered.
+// This E2E test checks that impressions and events are sent to backend via Beacon API when page is hidden.
 function beaconApiSendTestDebug(fetchMock, assert) {
 
   // Init and run Split client
@@ -100,8 +101,8 @@ function beaconApiSendTestDebug(fetchMock, assert) {
     client.getTreatment('hierarchical_splits_test');
     client.track('sometraffictype', 'someEvent', 10);
 
-    // trigger unload event inmmediatly, before scheduled push of events and impressions
-    triggerUnloadEvent();
+    // trigger visibilitychange event inmmediatly, before scheduled push of events and impressions
+    triggerVisibilitychange();
 
     // queue the assertion of the Beacon requests, destroy the client and execute the next E2E test named fallbackTest
     setTimeout(() => {
@@ -115,7 +116,7 @@ function beaconApiSendTestDebug(fetchMock, assert) {
   });
 }
 
-// This E2E test checks that impressions and events are sent to backend via Axios when page unload is triggered and Beacon API is not available.
+// This E2E test checks that impressions and events are sent to backend via Fetch API when page is hidden and Beacon API is not available.
 function fallbackTest(fetchMock, assert) {
 
   // destroy reference to Beacon API
@@ -136,7 +137,7 @@ function fallbackTest(fetchMock, assert) {
     }, 0);
   })();
 
-  // Mock endpoints used by Axios
+  // Mock endpoints
   fetchMock.postOnce(url(settings, '/testImpressions/bulk'), (url, opts) => {
     const resp = JSON.parse(opts.body);
     assert.ok(opts, 'Fallback to /testImpressions/bulk');
@@ -155,8 +156,8 @@ function fallbackTest(fetchMock, assert) {
   client.on(client.Event.SDK_READY, () => {
     client.getTreatment('hierarchical_splits_test');
     client.track('sometraffictype', 'someEvent', 10);
-    // trigger unload event inmmediatly, before scheduled push of events and impressions
-    triggerUnloadEvent();
+    // trigger pagehide event inmmediatly, before scheduled push of events and impressions
+    triggerPagehideEvent();
   });
 }
 
diff --git a/src/__tests__/browserSuites/use-beacon-api.spec.js b/src/__tests__/browserSuites/use-beacon-api.spec.js
index f6c6505fa..d36ceaf45 100644
--- a/src/__tests__/browserSuites/use-beacon-api.spec.js
+++ b/src/__tests__/browserSuites/use-beacon-api.spec.js
@@ -5,7 +5,7 @@ import splitChangesMock1 from '../mocks/splitchanges.since.-1.json';
 import mySegmentsFacundo from '../mocks/mysegments.facundo@split.io.json';
 import { url } from '../testUtils';
 import { OPTIMIZED } from '@splitsoftware/splitio-commons/src/utils/constants';
-import { triggerUnloadEvent } from '../testUtils/browser';
+import { triggerPagehideEvent, triggerVisibilitychange } from '../testUtils/browser';
 
 const config = {
   core: {
@@ -73,7 +73,7 @@ const assertCallsToBeaconAPI = (assert) => {
   assertImpressionsCountSent(assert, parsedPayload.entries);
 };
 
-// This E2E test checks that Beacon API is not called when page unload is triggered and there are not events or impressions to send.
+// This E2E test checks that Beacon API is not called when page is hidden and there are not events or impressions to send.
 function beaconApiNotSendTest(fetchMock, assert) {
   sendBeaconSpy = sinon.spy(window.navigator, 'sendBeacon');
 
@@ -87,8 +87,9 @@ function beaconApiNotSendTest(fetchMock, assert) {
   const client = splitio.client();
   client.on(client.Event.SDK_READY, () => {
 
-    // trigger unload event, without tracked events and impressions
-    triggerUnloadEvent();
+    // trigger events, without tracked events and impressions
+    triggerPagehideEvent();
+    triggerVisibilitychange();
 
     // destroy the client and execute the next E2E test named beaconApiSendTest
     setTimeout(() => {
@@ -102,7 +103,7 @@ function beaconApiNotSendTest(fetchMock, assert) {
   });
 }
 
-// This E2E test checks that impressions and events are sent to backend via Beacon API when page unload is triggered.
+// This E2E test checks that impressions and events are sent to backend via Beacon API when page is hidden.
 function beaconApiSendTest(fetchMock, assert) {
 
   // Init and run Split client
@@ -112,8 +113,9 @@ function beaconApiSendTest(fetchMock, assert) {
     client.getTreatment('hierarchical_splits_test');
     client.track('sometraffictype', 'someEvent', 10);
 
-    // trigger unload event inmmediatly, before scheduled push of events and impressions
-    triggerUnloadEvent();
+    // trigger both events inmmediatly, before scheduled push of events and impressions, to assert that beacon requests are not duplicated
+    triggerPagehideEvent();
+    triggerVisibilitychange();
 
     // queue the assertion of the Beacon requests, destroy the client and execute the next E2E test named fallbackTest
     setTimeout(() => {
@@ -127,7 +129,7 @@ function beaconApiSendTest(fetchMock, assert) {
   });
 }
 
-// This E2E test checks that impressions and events are sent to backend via Axios when page unload is triggered and Beacon API is not available.
+// This E2E test checks that impressions and events are sent to backend via Fetch API when page is hidden and Beacon API is not available.
 function fallbackTest(fetchMock, assert) {
 
   // destroy reference to Beacon API
@@ -149,7 +151,7 @@ function fallbackTest(fetchMock, assert) {
     }, 0);
   })();
 
-  // Mock endpoints used by Axios
+  // Mock endpoints
   fetchMock.postOnce(url(settings, '/testImpressions/bulk'), (url, opts) => {
     const resp = JSON.parse(opts.body);
     assert.ok(opts, 'Fallback to /testImpressions/bulk');
@@ -175,8 +177,9 @@ function fallbackTest(fetchMock, assert) {
   client.on(client.Event.SDK_READY, () => {
     client.getTreatment('hierarchical_splits_test');
     client.track('sometraffictype', 'someEvent', 10);
-    // trigger unload event inmmediatly, before scheduled push of events and impressions
-    triggerUnloadEvent();
+    // trigger both events inmmediatly, before scheduled push of events and impressions, to assert that POST requests are not duplicated
+    triggerPagehideEvent();
+    triggerVisibilitychange();
   });
 }
 
diff --git a/src/__tests__/browserSuites/user-consent.spec.js b/src/__tests__/browserSuites/user-consent.spec.js
index 32ecd90c4..7dd3cad9e 100644
--- a/src/__tests__/browserSuites/user-consent.spec.js
+++ b/src/__tests__/browserSuites/user-consent.spec.js
@@ -1,6 +1,6 @@
 import sinon from 'sinon';
 import { SplitFactory } from '../../';
-import { triggerUnloadEvent } from '../testUtils/browser';
+import { triggerPagehideEvent } from '../testUtils/browser';
 import { nearlyEqual, url } from '../testUtils';
 
 const trackedImpressions = [];
@@ -97,9 +97,9 @@ export default function userConsent(fetchMock, t) {
       ], ['on', 'on', 'on', 'on', 'on', 'on', 'on', 'on'], 'evaluating on SDK ready');
       if (isTracking) expectedTrackedImpressions += 8;
 
-      // Trigger unload event to validate browser listener behaviour
+      // Trigger pagehide event to validate browser listener behaviour
       // Beacon API is used only if user consent is GRANTED
-      triggerUnloadEvent();
+      triggerPagehideEvent();
       if (factory.UserConsent.getStatus() === factory.UserConsent.Status.GRANTED) {
         assert.ok(sendBeaconSpy.calledThrice, 'sendBeacon should have been called thrice');
       } else {
diff --git a/src/__tests__/destroy/browser.spec.js b/src/__tests__/destroy/browser.spec.js
index e61e9aaf0..167ca78fc 100644
--- a/src/__tests__/destroy/browser.spec.js
+++ b/src/__tests__/destroy/browser.spec.js
@@ -20,10 +20,10 @@ const settings = settingsFactory({
 
 fetchMock.getOnce(url(settings, '/splitChanges?since=-1'), { status: 200, body: splitChangesMock1 });
 fetchMock.getOnce(url(settings, '/splitChanges?since=-1500492097547'), { status: 200, body: splitChangesMock2 });
-
 fetchMock.getOnce(url(settings, '/mySegments/ut1'), { status: 200, body: mySegmentsMock });
 fetchMock.getOnce(url(settings, '/mySegments/ut2'), { status: 200, body: mySegmentsMock });
 fetchMock.getOnce(url(settings, '/mySegments/ut3'), { status: 200, body: mySegmentsMock });
+fetchMock.postOnce(url(settings, '/v1/metrics/config'), 200); // 0.1% sample rate
 
 tape('SDK destroy for BrowserJS', async function (assert) {
   const config = {
diff --git a/src/__tests__/gaIntegration/browser.spec.js b/src/__tests__/gaIntegration/browser.spec.js
index 02d96ae94..6d61aea16 100644
--- a/src/__tests__/gaIntegration/browser.spec.js
+++ b/src/__tests__/gaIntegration/browser.spec.js
@@ -16,10 +16,11 @@ const settings = settingsFactory({
   }
 });
 
-tape('## E2E CI Tests ##', function(assert) {
+tape('## E2E CI Tests ##', function (assert) {
 
   fetchMock.get(url(settings, '/splitChanges?since=-1'), { status: 200, body: splitChangesMock1 });
   fetchMock.get(url(settings, '/mySegments/facundo%40split.io'), { status: 200, body: mySegmentsFacundo });
+  fetchMock.post(/\/v1\/metrics/, 200); // 0.1% sample rate
 
   /* Validate GA integration */
   assert.test('E2E / GA-to-Split', gaToSplitSuite.bind(null, fetchMock));
diff --git a/src/__tests__/gaIntegration/ga-to-split.spec.js b/src/__tests__/gaIntegration/ga-to-split.spec.js
index 350d6627b..747f80642 100644
--- a/src/__tests__/gaIntegration/ga-to-split.spec.js
+++ b/src/__tests__/gaIntegration/ga-to-split.spec.js
@@ -412,4 +412,51 @@ export default function (fetchMock, assert) {
 
   });
 
-}
\ No newline at end of file
+  // test 'autoRequire' script placed right after GA script tag.
+  // We get same result if it is placed right before, and also applies for Universal Analytics configured with GTM and gtag.js tags.
+  // If it is executed asynchronously, trackers creation might be missed.
+  assert.test(t => {
+    fetchMock.postOnce(url(settings, '/events/bulk'), (url, opts) => {
+      const resp = JSON.parse(opts.body);
+      const sentHitsTracker1 = window.gaSpy.getHits('tracker1');
+      const sentHitsTracker2 = window.gaSpy.getHits('tracker2');
+
+      t.equal(resp.length, sentHitsTracker1.length + sentHitsTracker2.length, 'All hits of all trackers are captured as Split events');
+
+      setTimeout(() => {
+        client.destroy();
+        t.end();
+      });
+      return 200;
+    });
+
+    gaTag();
+
+    // Run autoRequire iife:
+    // require('@splitsoftware/splitio-commons/src/integrations/ga/autoRequire');
+    require('../../../scripts/ga-to-split-autorequire');
+
+    window.ga('create', 'UA-00000000-1', { name: 'tracker1', cookieDomain: 'auto', siteSpeedSampleRate: 0 });
+
+    gaSpy(['tracker1']);
+
+    window.ga('tracker1.send', 'event', 'mycategory', 'myaction1'); // Captured
+
+    const factory = SplitFactory({
+      ...config,
+      integrations: [{
+        type: 'GOOGLE_ANALYTICS_TO_SPLIT',
+        autoRequire: true
+      }],
+    });
+
+    window.ga('tracker1.send', 'event', 'mycategory', 'myaction2'); // Captured
+    window.ga('create', 'UA-00000001-1', 'auto', 'tracker2', { siteSpeedSampleRate: 0 }); // New tracker
+    gaSpy(['tracker2'], false);
+    window.ga('tracker2.send', 'event', 'mycategory', 'myaction3'); // Captured
+
+    client = factory.client();
+
+  });
+
+}
diff --git a/src/__tests__/gaIntegration/gaTestUtils.js b/src/__tests__/gaIntegration/gaTestUtils.js
index 2f607034c..dd8ba5ac0 100644
--- a/src/__tests__/gaIntegration/gaTestUtils.js
+++ b/src/__tests__/gaIntegration/gaTestUtils.js
@@ -2,19 +2,21 @@ export const DEFAULT_TRACKER = 't0';
 
 const HIT_FIELDS = ['hitType', 'nonInteraction'];
 const EVENT_FIELDS = ['eventCategory', 'eventAction', 'eventLabel', 'eventValue'];
+const FIELDS = [...HIT_FIELDS, ...EVENT_FIELDS]; // List of hit fields to spy, which are the ones set by the default SplitToGa mapper.
+
+let hits = {};
 
 /**
  * Spy ga hits per tracker.
  *
  * @param {string[]} trackerNames names of the trackers to spy. If not provided, it spies the default tracker. i.e., `gaSpy()` is equivalent to `gaSpy(['t0'])`.
- * @param {string[]} fieldNames names of the hit fields to spy. If not provided, it spies hit and event related fields. i.e., 'hitType', 'nonInteraction',
- * 'eventCategory', 'eventAction', 'eventLabel', and 'eventValue', which are the ones set by default SplitToGa mapper.
+ * @param {boolean} resetSpy true to reset the list of captured hits.
  *
  * @see {@link https://developers.google.com/analytics/devguides/collection/analyticsjs/field-reference}
  */
-export function gaSpy(trackerNames = [DEFAULT_TRACKER], fieldNames = [...HIT_FIELDS, ...EVENT_FIELDS]) {
+export function gaSpy(trackerNames = [DEFAULT_TRACKER], resetSpy = true) {
 
-  const hits = {};
+  if (resetSpy) hits = {};
 
   // access ga via its gaAlias, accounting for the possibility that the global command queue
   // has been renamed or not yet defined (analytics.js mutates window[gaAlias] reference)
@@ -31,7 +33,7 @@ export function gaSpy(trackerNames = [DEFAULT_TRACKER], fieldNames = [...HIT_FIE
           trackerToSniff.set('sendHitTask', function (model) {
             originalSendHitTask(model);
             const hit = {};
-            fieldNames.forEach(fieldName => {
+            FIELDS.forEach(fieldName => {
               hit[fieldName] = model.get(fieldName);
             });
             hits[trackerName].push(hit);
diff --git a/src/__tests__/nodeSuites/impressions.debug.spec.js b/src/__tests__/nodeSuites/impressions.debug.spec.js
index 2005d96c4..5c10f8065 100644
--- a/src/__tests__/nodeSuites/impressions.debug.spec.js
+++ b/src/__tests__/nodeSuites/impressions.debug.spec.js
@@ -6,8 +6,8 @@ import { DEBUG } from '@splitsoftware/splitio-commons/src/utils/constants';
 import { url } from '../testUtils';
 
 const baseUrls = {
-  sdk: 'https://sdk.baseurl/impressionsSuite',
-  events: 'https://events.baseurl/impressionsSuite'
+  sdk: 'https://sdk.baseurl/impressionsDebugSuite',
+  events: 'https://events.baseurl/impressionsDebugSuite'
 };
 
 const settings = settingsFactory({
@@ -88,7 +88,6 @@ export default async function (key, fetchMock, assert) {
 
     return 200;
   });
-  fetchMock.postOnce(url(settings, '/testImpressions/bulk'), 200);
 
   splitio.Logger.enable();
   evaluationsStart = Date.now();
diff --git a/src/__tests__/nodeSuites/impressions.spec.js b/src/__tests__/nodeSuites/impressions.spec.js
index 21324b560..098aefdf2 100644
--- a/src/__tests__/nodeSuites/impressions.spec.js
+++ b/src/__tests__/nodeSuites/impressions.spec.js
@@ -101,7 +101,6 @@ export default async function(key, fetchMock, assert) {
 
     return 200;
   });
-  fetchMock.postOnce(url(settings, '/testImpressions/bulk'), 200);
 
   fetchMock.postOnce(url(settings, '/testImpressions/count'), (url, opts) => {
     const data = JSON.parse(opts.body);
diff --git a/src/__tests__/nodeSuites/push-synchronization-retries.spec.js b/src/__tests__/nodeSuites/push-synchronization-retries.spec.js
index fce201003..3e71548d6 100644
--- a/src/__tests__/nodeSuites/push-synchronization-retries.spec.js
+++ b/src/__tests__/nodeSuites/push-synchronization-retries.spec.js
@@ -70,9 +70,8 @@ const MILLIS_THIRD_RETRY_FOR_SPLIT_KILL_EVENT = 2000;
  *    (we destroy the client here, to assert that all scheduled tasks are clean)
  */
 export function testSynchronizationRetries(fetchMock, assert) {
-  // we update the backoff default base, to reduce the time of the test
-  const ORIGINAL_DEFAULT_BASE_MILLIS = Backoff.DEFAULT_BASE_MILLIS;
-  Backoff.DEFAULT_BASE_MILLIS = 100;
+  // Force the backoff base of UpdateWorkers, from 10 secs to 100 ms, to reduce test time
+  Backoff.__TEST__BASE_MILLIS = 100;
 
   assert.plan(19);
   fetchMock.reset();
@@ -201,7 +200,7 @@ export function testSynchronizationRetries(fetchMock, assert) {
     setTimeout(() => {
       client.destroy().then(() => {
         assert.equal(client.getTreatment(key, 'whitelist'), 'control', 'evaluation returns control if client is destroyed');
-        Backoff.DEFAULT_BASE_MILLIS = ORIGINAL_DEFAULT_BASE_MILLIS;
+        Backoff.__TEST__BASE_MILLIS = undefined;
         assert.end();
       });
     });
diff --git a/src/__tests__/nodeSuites/push-synchronization.spec.js b/src/__tests__/nodeSuites/push-synchronization.spec.js
index d4857c8f8..e3e078237 100644
--- a/src/__tests__/nodeSuites/push-synchronization.spec.js
+++ b/src/__tests__/nodeSuites/push-synchronization.spec.js
@@ -128,7 +128,7 @@ export function testSynchronization(fetchMock, assert) {
         assert.equal(sdkUpdateCount, 5, 'SDK_UPDATE should be emitted 5 times');
         assert.end();
       });
-    }, MILLIS_DESTROY); // destroy client after 0.6 seconds
+    }, MILLIS_DESTROY); // destroy client after 0.7 seconds
   });
 
   // initial auth
diff --git a/src/__tests__/push/browser.spec.js b/src/__tests__/push/browser.spec.js
index d06c014e7..ecef8596c 100644
--- a/src/__tests__/push/browser.spec.js
+++ b/src/__tests__/push/browser.spec.js
@@ -9,6 +9,7 @@ import { testRefreshToken } from '../browserSuites/push-refresh-token.spec';
 import { testSplitKillOnReadyFromCache } from '../browserSuites/push-corner-cases.spec';
 
 fetchMock.config.overwriteRoutes = false;
+Math.random = () => 0.5; // SDKs without telemetry
 
 tape('## Browser JS - E2E CI Tests for PUSH ##', function (assert) {
 
diff --git a/src/__tests__/testUtils/browser.js b/src/__tests__/testUtils/browser.js
index b185e93da..60284923d 100644
--- a/src/__tests__/testUtils/browser.js
+++ b/src/__tests__/testUtils/browser.js
@@ -1,7 +1,19 @@
-// Util method to trigger 'unload' DOM event
-export function triggerUnloadEvent() {
+function triggerEvent(eventName) {
   const event = document.createEvent('HTMLEvents');
-  event.initEvent('unload', true, true);
-  event.eventName = 'unload';
+  event.initEvent(eventName, true, true);
+  event.eventName = eventName;
   window.dispatchEvent(event);
 }
+
+export function triggerUnloadEvent() {
+  triggerEvent('unload');
+}
+
+export function triggerPagehideEvent() {
+  triggerEvent('pagehide');
+}
+
+export function triggerVisibilitychange(state = 'hidden' /* 'hidden' | 'visible' */) {
+  Object.defineProperty(document, 'visibilityState', { value: state, writable: true });
+  document.dispatchEvent(new Event('visibilitychange'));
+}
diff --git a/src/settings/defaults/version.js b/src/settings/defaults/version.js
index ac6e8280b..bfb2bd5ce 100644
--- a/src/settings/defaults/version.js
+++ b/src/settings/defaults/version.js
@@ -1 +1 @@
-export const packageVersion = '10.20.0';
+export const packageVersion = '10.21.0';
diff --git a/src/settings/node.js b/src/settings/node.js
index 00a9a6d45..2dc97cb73 100644
--- a/src/settings/node.js
+++ b/src/settings/node.js
@@ -1,6 +1,6 @@
 import { settingsValidation } from '@splitsoftware/splitio-commons/src/utils/settingsValidation';
 import { validateLogger } from '@splitsoftware/splitio-commons/src/utils/settingsValidation/logger/builtinLogger';
-import { LocalhostFromFile } from '@splitsoftware/splitio-commons/src/sync/offline/LocalhostFromFile';
+import { LocalhostFromFile } from '../sync/offline/LocalhostFromFile';
 
 import { defaults } from './defaults/node';
 import { validateStorage } from './storage/node';
diff --git a/src/sync/offline/LocalhostFromFile.js b/src/sync/offline/LocalhostFromFile.js
new file mode 100644
index 000000000..3f63173ac
--- /dev/null
+++ b/src/sync/offline/LocalhostFromFile.js
@@ -0,0 +1,11 @@
+import { splitsParserFromFileFactory } from './splitsParserFromFile';
+import { syncManagerOfflineFactory } from '@splitsoftware/splitio-commons/src/sync/offline/syncManagerOffline';
+
+// Singleton instance of the factory function for offline SyncManager from YAML file (a.k.a. localhostFromFile)
+// It uses NodeJS APIs.
+const localhostFromFile = syncManagerOfflineFactory(splitsParserFromFileFactory);
+localhostFromFile.type = 'LocalhostFromFile';
+
+export function LocalhostFromFile() {
+  return localhostFromFile;
+}
diff --git a/src/sync/offline/splitsParserFromFile.js b/src/sync/offline/splitsParserFromFile.js
new file mode 100644
index 000000000..ef25e8e14
--- /dev/null
+++ b/src/sync/offline/splitsParserFromFile.js
@@ -0,0 +1,172 @@
+import fs from 'fs';
+import path from 'path';
+import yaml from 'js-yaml';
+import { isString, endsWith, find, forOwn, uniq, } from '@splitsoftware/splitio-commons/src/utils/lang';
+import { parseCondition } from '@splitsoftware/splitio-commons/src/sync/offline/splitsParser/parseCondition';
+
+const logPrefix = 'sync:offline:splits-fetcher: ';
+
+const DEFAULT_FILENAME = '.split';
+
+function configFilesPath(configFilePath) {
+  if (configFilePath === DEFAULT_FILENAME || !isString(configFilePath)) {
+    let root = process.env.HOME;
+
+    if (process.env.SPLIT_CONFIG_ROOT) root = process.env.SPLIT_CONFIG_ROOT;
+
+    if (!root) throw new Error('Missing split mock configuration root.');
+
+    configFilePath = path.join(root, DEFAULT_FILENAME);
+  }
+
+  // Validate the extensions
+  if (!(endsWith(configFilePath, '.yaml', true) || endsWith(configFilePath, '.yml', true) || endsWith(configFilePath, '.split', true)))
+    throw new Error(`Invalid extension specified for Splits mock file. Accepted extensions are ".yml" and ".yaml". Your specified file is ${configFilePath}`);
+
+  if (!fs.existsSync(configFilePath))
+    throw new Error(`Split configuration not found in ${configFilePath} - Please review your Split file location.`);
+
+  return configFilePath;
+}
+
+// This function is not pure nor meant to be. Here we apply modifications to cover
+// for behaviour that's ensured by the BE.
+function arrangeConditions(mocksData) {
+  // Iterate through each Split data
+  forOwn(mocksData, data => {
+    const conditions = data.conditions;
+
+    // On the manager, as the split jsons come with all treatments on the partitions prop,
+    // we'll add all the treatments to the first condition.
+    const firstRolloutCondition = find(conditions, cond => cond.conditionType === 'ROLLOUT');
+    // Malformed mocks may have
+    const treatments = uniq(data.treatments);
+    // If they're only specifying a whitelist we add the treatments there.
+    const allTreatmentsCondition = firstRolloutCondition ? firstRolloutCondition : conditions[0];
+
+    const fullyAllocatedTreatment = allTreatmentsCondition.partitions[0].treatment;
+
+    treatments.forEach(treatment => {
+      if (treatment !== fullyAllocatedTreatment) {
+        allTreatmentsCondition.partitions.push({
+          treatment, size: 0
+        });
+      }
+    });
+
+    // Don't need these anymore
+    delete data.treatments;
+  });
+}
+
+export function splitsParserFromFileFactory() {
+
+  let previousMock = 'NO_MOCK_LOADED';
+
+  // Parse `.split` configuration file and return a map of "Split Objects"
+  function readSplitConfigFile(log, filePath) {
+    const SPLIT_POSITION = 0;
+    const TREATMENT_POSITION = 1;
+    let data;
+
+    try {
+      data = fs.readFileSync(filePath, 'utf-8');
+    } catch (e) {
+      log.error(e && e.message);
+
+      return {};
+    }
+
+    if (data === previousMock) return false;
+    previousMock = data;
+
+    const splitObjects = data.split(/\r?\n/).reduce((accum, line, index) => {
+      let tuple = line.trim();
+
+      if (tuple === '' || tuple.charAt(0) === '#') {
+        log.debug(logPrefix + `Ignoring empty line or comment at #${index}`);
+      } else {
+        tuple = tuple.split(/\s+/);
+
+        if (tuple.length !== 2) {
+          log.debug(logPrefix + `Ignoring line since it does not have exactly two columns #${index}`);
+        } else {
+          const splitName = tuple[SPLIT_POSITION];
+          const condition = parseCondition({ treatment: tuple[TREATMENT_POSITION] });
+          accum[splitName] = { conditions: [condition], configurations: {}, trafficTypeName: 'localhost' };
+        }
+      }
+
+      return accum;
+    }, {});
+
+    return splitObjects;
+  }
+
+  // Parse `.yml` or `.yaml` configuration files and return a map of "Split Objects"
+  function readYAMLConfigFile(log, filePath) {
+    let data = '';
+    let yamldoc = null;
+
+    try {
+      data = fs.readFileSync(filePath, 'utf8');
+
+      if (data === previousMock) return false;
+      previousMock = data;
+
+      yamldoc = yaml.safeLoad(data);
+    } catch (e) {
+      log.error(e);
+
+      return {};
+    }
+
+    // Each entry will be mapped to a condition, but we'll also keep the configurations map.
+    const mocksData = (yamldoc).reduce((accum, splitEntry) => {
+      const splitName = Object.keys(splitEntry)[0];
+
+      if (!splitName || !isString(splitEntry[splitName].treatment))
+        log.error(logPrefix + 'Ignoring entry on YAML since the format is incorrect.');
+
+      const mockData = splitEntry[splitName];
+
+      // "Template" for each split accumulated data
+      if (!accum[splitName]) {
+        accum[splitName] = {
+          configurations: {}, conditions: [], treatments: [], trafficTypeName: 'localhost'
+        };
+      }
+
+      // Assign the config if there is one on the mock
+      if (mockData.config) accum[splitName].configurations[mockData.treatment] = mockData.config;
+      // Parse the condition from the entry.
+      const condition = parseCondition(mockData);
+      accum[splitName].conditions[condition.conditionType === 'ROLLOUT' ? 'push' : 'unshift'](condition);
+      // Also keep track of the treatments, will be useful for manager functionality.
+      accum[splitName].treatments.push(mockData.treatment);
+
+      return accum;
+    }, {});
+
+    arrangeConditions(mocksData);
+
+    return mocksData;
+  }
+
+  // Load the content of a configuration file into an Object
+  return function splitsParserFromFile({ features, log }) {
+    const filePath = configFilesPath(features);
+    let mockData;
+
+    // If we have a filePath, it means the extension is correct, choose the parser.
+    if (endsWith(filePath, '.split')) {
+      log.warn(logPrefix + '.split mocks will be deprecated soon in favor of YAML files, which provide more targeting power. Take a look in our documentation.');
+      mockData = readSplitConfigFile(log, filePath);
+    } else {
+      mockData = readYAMLConfigFile(log, filePath);
+    }
+
+    return mockData;
+  };
+
+}
diff --git a/ts-tests/index.ts b/ts-tests/index.ts
index 27926f4fc..31d3416c7 100644
--- a/ts-tests/index.ts
+++ b/ts-tests/index.ts
@@ -456,6 +456,7 @@ let customGoogleAnalyticsToSplitConfig: SplitIO.IGoogleAnalyticsToSplitConfig =
   mapper: function (model: UniversalAnalytics.Model, defaultMapping: SplitIO.EventData): SplitIO.EventData { return eventDataSample; },
   prefix: 'PREFIX',
   identities: [{ key: 'key1', trafficType: 'tt1' }, { key: 'key2', trafficType: 'tt2' }],
+  autoRequire: true
 };
 let customSplitToGoogleAnalyticsConfig: SplitIO.ISplitToGoogleAnalyticsConfig = {
   type: 'SPLIT_TO_GOOGLE_ANALYTICS',
diff --git a/types/splitio.d.ts b/types/splitio.d.ts
index 7f138a353..eff7d5850 100644
--- a/types/splitio.d.ts
+++ b/types/splitio.d.ts
@@ -716,7 +716,7 @@ declare namespace SplitIO {
   /**
    * Enable 'Google Analytics to Split' integration, to track Google Analytics hits as Split events.
    *
-   * @see {@link https://help.split.io/hc/en-us/articles/360020448791-JavaScript-SDK#integrations}
+   * @see {@link https://help.split.io/hc/en-us/articles/360040838752#google-analytics-to-split}
    */
   interface IGoogleAnalyticsToSplitConfig {
     type: 'GOOGLE_ANALYTICS_TO_SPLIT',
@@ -758,6 +758,17 @@ declare namespace SplitIO {
      * If not provided, events are sent using the key and traffic type provided at SDK config
      */
     identities?: Identity[],
+    /**
+     * Optional flag to log an error if the `auto-require` script is not detected.
+     * The auto-require script automatically requires the `splitTracker` plugin for created trackers,
+     * and should be placed right after your Google Analytics, Google Tag Manager or gtag.js script tag.
+     *
+     * @see {@link https://help.split.io/hc/en-us/articles/360040838752#set-up-with-gtm-and-gtag.js}
+     *
+     * @property {boolean} autoRequire
+     * @default false
+     */
+    autoRequire?: boolean,
   }
   /**
    * Object representing the data sent by Split (events and impressions).
@@ -769,7 +780,7 @@ declare namespace SplitIO {
   /**
    * Enable 'Split to Google Analytics' integration, to track Split impressions and events as Google Analytics hits.
    *
-   * @see {@link https://help.split.io/hc/en-us/articles/360020448791-JavaScript-SDK#integrations}
+   * @see {@link https://help.split.io/hc/en-us/articles/360040838752#split-to-google-analytics}
    */
   interface ISplitToGoogleAnalyticsConfig {
     type: 'SPLIT_TO_GOOGLE_ANALYTICS',