diff --git a/CHANGES.txt b/CHANGES.txt
index db1fa81e..29391a11 100644
--- a/CHANGES.txt
+++ b/CHANGES.txt
@@ -1,3 +1,6 @@
+2.2.0 (March 28, 2025)
+ - Added new optional argument to the client `getTreatment` methods to allow passing additional evaluation options, such as a map of properties to append to the generated impression object sent to Split backend.
+
 2.1.0 (January 17, 2025)
  - Added support for the new impressions tracking toggle available on feature flags, both respecting the setting and including the new field being returned on `SplitView` type objects. Read more in our docs.
 
diff --git a/package-lock.json b/package-lock.json
index f15fce99..4cccfff2 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "@splitsoftware/splitio-commons",
-  "version": "2.1.0",
+  "version": "2.1.1-rc.1",
   "lockfileVersion": 2,
   "requires": true,
   "packages": {
     "": {
       "name": "@splitsoftware/splitio-commons",
-      "version": "2.1.0",
+      "version": "2.1.1-rc.1",
       "license": "Apache-2.0",
       "dependencies": {
         "@types/ioredis": "^4.28.0",
@@ -67,13 +67,14 @@
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-      "version": "7.22.13",
-      "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.22.13.tgz",
-      "integrity": "sha512-XktuhWlJ5g+3TJXc5upd9Ks1HutSArik6jf2eAjYFyIOf4ej3RN+184cZbzDvbPnuTJIUhPKKJE3cIsYTiAT3w==",
+      "version": "7.26.2",
+      "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.26.2.tgz",
+      "integrity": "sha512-RJlIHRueQgwWitWgF8OdFYGZX328Ax5BCemNGlqHfplnRT9ESi8JkFlvaVYbS+UubVY6dpv87Fs2u5M29iNFVQ==",
       "dev": true,
       "dependencies": {
-        "@babel/highlight": "^7.22.13",
-        "chalk": "^2.4.2"
+        "@babel/helper-validator-identifier": "^7.25.9",
+        "js-tokens": "^4.0.0",
+        "picocolors": "^1.0.0"
       },
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         "node": ">=6.9.0"
@@ -266,18 +267,18 @@
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-      "resolved": "https://registry.npmjs.org/@babel/helper-string-parser/-/helper-string-parser-7.22.5.tgz",
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+      "version": "7.25.9",
+      "resolved": "https://registry.npmjs.org/@babel/helper-string-parser/-/helper-string-parser-7.25.9.tgz",
+      "integrity": "sha512-4A/SCr/2KLd5jrtOMFzaKjVtAei3+2r/NChoBNoZ3EyP/+GlhoaEGoWOZUmFmoITP7zOJyHIMm+DYRd8o3PvHA==",
       "dev": true,
       "engines": {
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       }
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     "node_modules/@babel/helper-validator-identifier": {
-      "version": "7.22.20",
-      "resolved": "https://registry.npmjs.org/@babel/helper-validator-identifier/-/helper-validator-identifier-7.22.20.tgz",
-      "integrity": "sha512-Y4OZ+ytlatR8AI+8KZfKuL5urKp7qey08ha31L8b3BwewJAoJamTzyvxPR/5D+KkdJCGPq/+8TukHBlY10FX9A==",
+      "version": "7.25.9",
+      "resolved": "https://registry.npmjs.org/@babel/helper-validator-identifier/-/helper-validator-identifier-7.25.9.tgz",
+      "integrity": "sha512-Ed61U6XJc3CVRfkERJWDz4dJwKe7iLmmJsbOGu9wSloNSFttHV0I8g6UAgb7qnK5ly5bGLPd4oXZlxCdANBOWQ==",
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@@ -293,38 +294,26 @@
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-      "resolved": "https://registry.npmjs.org/@babel/helpers/-/helpers-7.22.5.tgz",
-      "integrity": "sha512-pSXRmfE1vzcUIDFQcSGA5Mr+GxBV9oiRKDuDxXvWQQBCh8HoIjs/2DlDB7H8smac1IVrB9/xdXj2N3Wol9Cr+Q==",
+      "version": "7.26.10",
+      "resolved": "https://registry.npmjs.org/@babel/helpers/-/helpers-7.26.10.tgz",
+      "integrity": "sha512-UPYc3SauzZ3JGgj87GgZ89JVdC5dj0AoetR5Bw6wj4niittNyFh6+eOGonYvJ1ao6B8lEa3Q3klS7ADZ53bc5g==",
       "dev": true,
       "dependencies": {
-        "@babel/template": "^7.22.5",
-        "@babel/traverse": "^7.22.5",
-        "@babel/types": "^7.22.5"
+        "@babel/template": "^7.26.9",
+        "@babel/types": "^7.26.10"
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-    "node_modules/@babel/highlight": {
-      "version": "7.22.20",
-      "resolved": "https://registry.npmjs.org/@babel/highlight/-/highlight-7.22.20.tgz",
-      "integrity": "sha512-dkdMCN3py0+ksCgYmGG8jKeGA/8Tk+gJwSYYlFGxG5lmhfKNoAy004YpLxpS1W2J8m/EK2Ew+yOs9pVRwO89mg==",
+    "node_modules/@babel/parser": {
+      "version": "7.26.10",
+      "resolved": "https://registry.npmjs.org/@babel/parser/-/parser-7.26.10.tgz",
+      "integrity": "sha512-6aQR2zGE/QFi8JpDLjUZEPYOs7+mhKXm86VaKFiLP35JQwQb6bwUE+XbvkH0EptsYhbNBSUGaUBLKqxH1xSgsA==",
       "dev": true,
       "dependencies": {
-        "@babel/helper-validator-identifier": "^7.22.20",
-        "chalk": "^2.4.2",
-        "js-tokens": "^4.0.0"
+        "@babel/types": "^7.26.10"
       },
-      "engines": {
-        "node": ">=6.9.0"
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-    },
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-      "resolved": "https://registry.npmjs.org/@babel/parser/-/parser-7.23.0.tgz",
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-      "dev": true,
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@@ -495,9 +484,9 @@
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-      "resolved": "https://registry.npmjs.org/@babel/runtime/-/runtime-7.25.6.tgz",
-      "integrity": "sha512-VBj9MYyDb9tuLq7yzqjgzt6Q+IBQLrGZfdjOekyEirZPHxXWoTSGUTMrpsfi58Up73d13NfYLv8HT9vmznjzhQ==",
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+      "resolved": "https://registry.npmjs.org/@babel/runtime/-/runtime-7.26.10.tgz",
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@@ -507,14 +496,14 @@
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-      "resolved": "https://registry.npmjs.org/@babel/template/-/template-7.22.15.tgz",
-      "integrity": "sha512-QPErUVm4uyJa60rkI73qneDacvdvzxshT3kksGqlGWYdOTIUOwJ7RDUL8sGqslY1uXWSL6xMFKEXDS3ox2uF0w==",
+      "version": "7.26.9",
+      "resolved": "https://registry.npmjs.org/@babel/template/-/template-7.26.9.tgz",
+      "integrity": "sha512-qyRplbeIpNZhmzOysF/wFMuP9sctmh2cFzRAZOn1YapxBsE1i9bJIY586R/WBLfLcmcBlM8ROBiQURnnNy+zfA==",
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       "dependencies": {
-        "@babel/code-frame": "^7.22.13",
-        "@babel/parser": "^7.22.15",
-        "@babel/types": "^7.22.15"
+        "@babel/code-frame": "^7.26.2",
+        "@babel/parser": "^7.26.9",
+        "@babel/types": "^7.26.9"
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@@ -542,14 +531,13 @@
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+      "resolved": "https://registry.npmjs.org/@babel/types/-/types-7.26.10.tgz",
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-        "@babel/helper-string-parser": "^7.22.5",
-        "@babel/helper-validator-identifier": "^7.22.20",
-        "to-fast-properties": "^2.0.0"
+        "@babel/helper-string-parser": "^7.25.9",
+        "@babel/helper-validator-identifier": "^7.25.9"
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@@ -1979,18 +1967,6 @@
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@@ -2379,20 +2355,6 @@
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-      "resolved": "https://registry.npmjs.org/chalk/-/chalk-2.4.2.tgz",
-      "integrity": "sha512-Mti+f9lpJNcwF4tWV8/OrTTtF1gZi+f8FqlyAdouralcFWFQWF2+NgCHShjkCb+IFBLq9buZwE1xckQU4peSuQ==",
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-        "supports-color": "^5.3.0"
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@@ -2459,21 +2421,6 @@
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-      "resolved": "https://registry.npmjs.org/color-convert/-/color-convert-1.9.3.tgz",
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-      "dependencies": {
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-      "resolved": "https://registry.npmjs.org/color-name/-/color-name-1.1.3.tgz",
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@@ -2812,15 +2759,6 @@
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@@ -3978,15 +3916,6 @@
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@@ -7465,18 +7394,6 @@
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+      "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.26.2.tgz",
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-        "@babel/highlight": "^7.22.13",
-        "chalk": "^2.4.2"
+        "@babel/helper-validator-identifier": "^7.25.9",
+        "js-tokens": "^4.0.0",
+        "picocolors": "^1.0.0"
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-        "chalk": "^2.4.2",
-        "js-tokens": "^4.0.0"
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+      "integrity": "sha512-2WJMeRQPHKSPemqk/awGrAiuFfzBmOIPXKizAsVhWH9YJqLZ0H+HS4c8loHGgW6utJ3E/ejXQUsiGaQy2NZ9Fw==",
       "dev": true,
       "requires": {
         "regenerator-runtime": "^0.14.0"
       }
     },
     "@babel/template": {
-      "version": "7.22.15",
-      "resolved": "https://registry.npmjs.org/@babel/template/-/template-7.22.15.tgz",
-      "integrity": "sha512-QPErUVm4uyJa60rkI73qneDacvdvzxshT3kksGqlGWYdOTIUOwJ7RDUL8sGqslY1uXWSL6xMFKEXDS3ox2uF0w==",
+      "version": "7.26.9",
+      "resolved": "https://registry.npmjs.org/@babel/template/-/template-7.26.9.tgz",
+      "integrity": "sha512-qyRplbeIpNZhmzOysF/wFMuP9sctmh2cFzRAZOn1YapxBsE1i9bJIY586R/WBLfLcmcBlM8ROBiQURnnNy+zfA==",
       "dev": true,
       "requires": {
-        "@babel/code-frame": "^7.22.13",
-        "@babel/parser": "^7.22.15",
-        "@babel/types": "^7.22.15"
+        "@babel/code-frame": "^7.26.2",
+        "@babel/parser": "^7.26.9",
+        "@babel/types": "^7.26.9"
       }
     },
     "@babel/traverse": {
@@ -8520,14 +8420,13 @@
       }
     },
     "@babel/types": {
-      "version": "7.23.0",
-      "resolved": "https://registry.npmjs.org/@babel/types/-/types-7.23.0.tgz",
-      "integrity": "sha512-0oIyUfKoI3mSqMvsxBdclDwxXKXAUA8v/apZbc+iSyARYou1o8ZGDxbUYyLFoW2arqS2jDGqJuZvv1d/io1axg==",
+      "version": "7.26.10",
+      "resolved": "https://registry.npmjs.org/@babel/types/-/types-7.26.10.tgz",
+      "integrity": "sha512-emqcG3vHrpxUKTrxcblR36dcrcoRDvKmnL/dCL6ZsHaShW80qxCAcNhzQZrpeM765VzEos+xOi4s+r4IXzTwdQ==",
       "dev": true,
       "requires": {
-        "@babel/helper-string-parser": "^7.22.5",
-        "@babel/helper-validator-identifier": "^7.22.20",
-        "to-fast-properties": "^2.0.0"
+        "@babel/helper-string-parser": "^7.25.9",
+        "@babel/helper-validator-identifier": "^7.25.9"
       }
     },
     "@bcoe/v8-coverage": {
@@ -9608,15 +9507,6 @@
       "integrity": "sha512-quJQXlTSUGL2LH9SUXo8VwsY4soanhgo6LNSm84E1LBcE8s3O0wpdiRzyR9z/ZZJMlMWv37qOOb9pdJlMUEKFQ==",
       "dev": true
     },
-    "ansi-styles": {
-      "version": "3.2.1",
-      "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-3.2.1.tgz",
-      "integrity": "sha512-VT0ZI6kZRdTh8YyJw3SMbYm/u+NqfsAxEpWO0Pf9sq8/e94WxxOpPKx9FR1FlyCtOVDNOQ+8ntlqFxiRc+r5qA==",
-      "dev": true,
-      "requires": {
-        "color-convert": "^1.9.0"
-      }
-    },
     "anymatch": {
       "version": "3.1.3",
       "resolved": "https://registry.npmjs.org/anymatch/-/anymatch-3.1.3.tgz",
@@ -9898,17 +9788,6 @@
       "integrity": "sha512-7LTwJjcRkzKFmtqGsibMeuXmvFDfZq/nzIjnmgCGzKKRVzjD72selLDK1oPF/Oxzmt4fNcPvTDvGqSDG4tCALw==",
       "dev": true
     },
-    "chalk": {
-      "version": "2.4.2",
-      "resolved": "https://registry.npmjs.org/chalk/-/chalk-2.4.2.tgz",
-      "integrity": "sha512-Mti+f9lpJNcwF4tWV8/OrTTtF1gZi+f8FqlyAdouralcFWFQWF2+NgCHShjkCb+IFBLq9buZwE1xckQU4peSuQ==",
-      "dev": true,
-      "requires": {
-        "ansi-styles": "^3.2.1",
-        "escape-string-regexp": "^1.0.5",
-        "supports-color": "^5.3.0"
-      }
-    },
     "char-regex": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/char-regex/-/char-regex-1.0.2.tgz",
@@ -9956,21 +9835,6 @@
       "integrity": "sha512-iBPtljfCNcTKNAto0KEtDfZ3qzjJvqE3aTGZsbhjSBlorqpXJlaWWtPO35D+ZImoC3KWejX64o+yPGxhWSTzfg==",
       "dev": true
     },
-    "color-convert": {
-      "version": "1.9.3",
-      "resolved": "https://registry.npmjs.org/color-convert/-/color-convert-1.9.3.tgz",
-      "integrity": "sha512-QfAUtd+vFdAtFQcC8CCyYt1fYWxSqAiK2cSD6zDB8N3cpsEBAvRxp9zOGg6G/SHHJYAT88/az/IuDGALsNVbGg==",
-      "dev": true,
-      "requires": {
-        "color-name": "1.1.3"
-      }
-    },
-    "color-name": {
-      "version": "1.1.3",
-      "resolved": "https://registry.npmjs.org/color-name/-/color-name-1.1.3.tgz",
-      "integrity": "sha512-72fSenhMw2HZMTVHeCA9KCmpEIbzWiQsjN+BHcBbS9vr1mtt+vJjPdksIBNUmKAW8TFUDPJK5SUU3QhE9NEXDw==",
-      "dev": true
-    },
     "combined-stream": {
       "version": "1.0.8",
       "resolved": "https://registry.npmjs.org/combined-stream/-/combined-stream-1.0.8.tgz",
@@ -10228,12 +10092,6 @@
       "integrity": "sha512-WUj2qlxaQtO4g6Pq5c29GTcWGDyd8itL8zTlipgECz3JesAiiOKotd8JU6otB3PACgG6xkJUyVhboMS+bje/jA==",
       "dev": true
     },
-    "escape-string-regexp": {
-      "version": "1.0.5",
-      "resolved": "https://registry.npmjs.org/escape-string-regexp/-/escape-string-regexp-1.0.5.tgz",
-      "integrity": "sha512-vbRorB5FUQWvla16U8R/qgaFIya2qGzwDrNmCZuYKrbdSUMG6I1ZCGQRefkRVhuOkIGVne7BQ35DSfo1qvJqFg==",
-      "dev": true
-    },
     "escodegen": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/escodegen/-/escodegen-2.0.0.tgz",
@@ -11089,12 +10947,6 @@
       "integrity": "sha512-LSBS2LjbNBTf6287JEbEzvJgftkF5qFkmCo9hDRpAzKhUOlJ+hx8dd4USs00SgsUNwc4617J9ki5YtEClM2ffA==",
       "dev": true
     },
-    "has-flag": {
-      "version": "3.0.0",
-      "resolved": "https://registry.npmjs.org/has-flag/-/has-flag-3.0.0.tgz",
-      "integrity": "sha512-sKJf1+ceQBr4SMkvQnBDNDtf4TXpVhVGateu0t918bl30FnbE2m4vNLX+VWe/dpjlb+HugGYzW7uQXH98HPEYw==",
-      "dev": true
-    },
     "has-symbols": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/has-symbols/-/has-symbols-1.0.2.tgz",
@@ -13670,15 +13522,6 @@
       "integrity": "sha512-6fPc+R4ihwqP6N/aIv2f1gMH8lOVtWQHoqC4yK6oSDVVocumAsfCqjkXnqiYMhmMwS/mEHLp7Vehlt3ql6lEig==",
       "dev": true
     },
-    "supports-color": {
-      "version": "5.5.0",
-      "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-5.5.0.tgz",
-      "integrity": "sha512-QjVjwdXIt408MIiAqCX4oUKsgU2EqAGzs2Ppkm4aQYbjm+ZEWEcW4SfFNTr4uMNZma0ey4f5lgLrkB0aX0QMow==",
-      "dev": true,
-      "requires": {
-        "has-flag": "^3.0.0"
-      }
-    },
     "supports-hyperlinks": {
       "version": "2.3.0",
       "resolved": "https://registry.npmjs.org/supports-hyperlinks/-/supports-hyperlinks-2.3.0.tgz",
@@ -13757,12 +13600,6 @@
       "integrity": "sha512-3f0uOEAQwIqGuWW2MVzYg8fV/QNnc/IpuJNG837rLuczAaLVHslWHZQj4IGiEl5Hs3kkbhwL9Ab7Hrsmuj+Smw==",
       "dev": true
     },
-    "to-fast-properties": {
-      "version": "2.0.0",
-      "resolved": "https://registry.npmjs.org/to-fast-properties/-/to-fast-properties-2.0.0.tgz",
-      "integrity": "sha1-3F5pjL0HkmW8c+A3doGk5Og/YW4=",
-      "dev": true
-    },
     "to-regex-range": {
       "version": "5.0.1",
       "resolved": "https://registry.npmjs.org/to-regex-range/-/to-regex-range-5.0.1.tgz",
diff --git a/package.json b/package.json
index d51bc14f..5f6a44d9 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@splitsoftware/splitio-commons",
-  "version": "2.1.0",
+  "version": "2.1.1-rc.1",
   "description": "Split JavaScript SDK common components",
   "main": "cjs/index.js",
   "module": "esm/index.js",
diff --git a/src/logger/messages/error.ts b/src/logger/messages/error.ts
index 2c0b0c63..123f8eee 100644
--- a/src/logger/messages/error.ts
+++ b/src/logger/messages/error.ts
@@ -21,7 +21,7 @@ export const codesError: [number, string][] = [
   // input validation
   [c.ERROR_EVENT_TYPE_FORMAT, '%s: you passed "%s", event_type must adhere to the regular expression /^[a-zA-Z0-9][-_.:a-zA-Z0-9]{0,79}$/g. This means an event_type must be alphanumeric, cannot be more than 80 characters long, and can only include a dash, underscore, period, or colon as separators of alphanumeric characters.'],
   [c.ERROR_NOT_PLAIN_OBJECT, '%s: %s must be a plain object.'],
-  [c.ERROR_SIZE_EXCEEDED, '%s: the maximum size allowed for the properties is 32768 bytes, which was exceeded. Event not queued.'],
+  [c.ERROR_SIZE_EXCEEDED, '%s: the maximum size allowed for the properties is 32768 bytes, which was exceeded.'],
   [c.ERROR_NOT_FINITE, '%s: value must be a finite number.'],
   [c.ERROR_NULL, '%s: you passed a null or undefined %s. It must be a non-empty string.'],
   [c.ERROR_TOO_LONG, '%s: %s too long. It must have 250 characters or less.'],
diff --git a/src/logger/messages/warn.ts b/src/logger/messages/warn.ts
index 52487f95..568771a8 100644
--- a/src/logger/messages/warn.ts
+++ b/src/logger/messages/warn.ts
@@ -18,7 +18,7 @@ export const codesWarn: [number, string][] = codesError.concat([
   [c.CLIENT_NO_LISTENER, 'No listeners for SDK Readiness detected. Incorrect control treatments could have been logged if you called getTreatment/s while the SDK was not yet ready.'],
   // input validation
   [c.WARN_SETTING_NULL, '%s: Property "%s" is of invalid type. Setting value to null.'],
-  [c.WARN_TRIMMING_PROPERTIES, '%s: Event has more than 300 properties. Some of them will be trimmed when processed.'],
+  [c.WARN_TRIMMING_PROPERTIES, '%s: more than 300 properties were provided. Some of them will be trimmed when processed.'],
   [c.WARN_CONVERTING, '%s: %s "%s" is not of type string, converting.'],
   [c.WARN_TRIMMING, '%s: %s "%s" has extra whitespace, trimming.'],
   [c.WARN_NOT_EXISTENT_SPLIT, '%s: feature flag "%s" does not exist in this environment. Please double check what feature flags exist in the Split user interface.'],
diff --git a/src/sdkClient/__tests__/clientAttributesDecoration.spec.ts b/src/sdkClient/__tests__/clientAttributesDecoration.spec.ts
index e007dc54..65aa8ef1 100644
--- a/src/sdkClient/__tests__/clientAttributesDecoration.spec.ts
+++ b/src/sdkClient/__tests__/clientAttributesDecoration.spec.ts
@@ -33,7 +33,7 @@ const clientMock = {
   }
 };
 // @ts-expect-error
-const client = clientAttributesDecoration(loggerMock, clientMock);
+const client: any = clientAttributesDecoration(loggerMock, clientMock);
 
 test('ATTRIBUTES DECORATION / storage', () => {
 
@@ -91,9 +91,7 @@ describe('ATTRIBUTES DECORATION / validation', () => {
 
   test('Should return false if it is an invalid attributes map', () => {
     expect(client.setAttribute('', 'attributeValue')).toEqual(false); // It should be invalid if the attribute key is not a string
-    // @ts-expect-error
     expect(client.setAttribute('attributeKey1', new Date())).toEqual(false); // It should be invalid if the attribute value is not a String, Number, Boolean or Lists.
-    // @ts-expect-error
     expect(client.setAttribute('attributeKey2', { 'some': 'object' })).toEqual(false); // It should be invalid if the attribute value is not a String, Number, Boolean or Lists.
     expect(client.setAttribute('attributeKey3', Infinity)).toEqual(false); // It should be invalid if the attribute value is not a String, Number, Boolean or Lists.
 
@@ -153,180 +151,31 @@ describe('ATTRIBUTES DECORATION / validation', () => {
 
 describe('ATTRIBUTES DECORATION / evaluation', () => {
 
-  test('Evaluation attributes logic and precedence / getTreatment', () => {
-
+  test.each([
+    ['getTreatment', 'split'],
+    ['getTreatments', ['split']],
+    ['getTreatmentWithConfig', 'split'],
+    ['getTreatmentsWithConfig', ['split']],
+    ['getTreatmentsByFlagSet', 'set'],
+    ['getTreatmentsWithConfigByFlagSet', 'set'],
+    ['getTreatmentsByFlagSets', ['set']],
+    ['getTreatmentsWithConfigByFlagSets', ['set']]
+  ])('Evaluation attributes logic and precedence / %s', (method, param) => {
     // If the same attribute is “cached” and provided on the function, the value received on the function call takes precedence.
-    expect(client.getTreatment('key', 'split')).toEqual(undefined); // Nothing changes if no attributes were provided using the new api
-    expect(client.getTreatment('key', 'split', { func_attr_bool: true, func_attr_str: 'true' })).toEqual({ func_attr_bool: true, func_attr_str: 'true' }); // Nothing changes if no attributes were provided using the new api
+    expect(client[method]('key', param)).toEqual(undefined); // Nothing changes if no attributes were provided using the new api
+    expect(client[method]('key', param, { func_attr_bool: true, func_attr_str: 'true' })).toEqual({ func_attr_bool: true, func_attr_str: 'true' }); // Nothing changes if no attributes were provided using the new api
     expect(client.getAttributes()).toEqual({}); // Attributes in memory storage must be empty
     client.setAttribute('func_attr_bool', false);
     expect(client.getAttributes()).toEqual({ 'func_attr_bool': false }); // In memory attribute storage must have the unique stored attribute
-    expect(client.getTreatment('key', 'split', { func_attr_bool: true, func_attr_str: 'true' })).toEqual({ func_attr_bool: true, func_attr_str: 'true' }); // Function attributes has precedence against api ones
-    // @ts-ignore
-    expect(client.getTreatment('key', 'split', null)).toEqual({ func_attr_bool: false }); // API attributes should be kept in memory and use for evaluations
-    expect(client.getTreatment('key', 'split', { func_attr_str: 'true' })).toEqual({ func_attr_bool: false, func_attr_str: 'true' }); // API attributes should be kept in memory and use for evaluations
+    expect(client[method]('key', param, { func_attr_bool: true, func_attr_str: 'true' })).toEqual({ func_attr_bool: true, func_attr_str: 'true' }); // Function attributes has precedence against api ones
+    expect(client[method]('key', param, null)).toEqual({ func_attr_bool: false }); // API attributes should be kept in memory and use for evaluations
+    expect(client[method]('key', param, { func_attr_str: 'true' })).toEqual({ func_attr_bool: false, func_attr_str: 'true' }); // API attributes should be kept in memory and use for evaluations
     client.setAttributes({ func_attr_str: 'false' });
     expect(client.getAttributes()).toEqual({ 'func_attr_bool': false, 'func_attr_str': 'false' }); // In memory attribute storage must have two stored attributes
-    expect(client.getTreatment('key', 'split', { func_attr_bool: true, func_attr_str: 'true', func_attr_number: 1 })).toEqual({ func_attr_bool: true, func_attr_str: 'true', func_attr_number: 1 }); // Function attributes has precedence against api ones
-    // @ts-ignore
-    expect(client.getTreatment('key', 'split', null)).toEqual({ func_attr_bool: false, func_attr_str: 'false' }); // If the getTreatment function is called without attributes, stored attributes will be used to evaluate.
-    expect(client.getTreatment('key', 'split')).toEqual({ func_attr_bool: false, func_attr_str: 'false' }); // If the getTreatment function is called without attributes, stored attributes will be used to evaluate.
+    expect(client[method]('key', param, { func_attr_bool: true, func_attr_str: 'true', func_attr_number: 1 })).toEqual({ func_attr_bool: true, func_attr_str: 'true', func_attr_number: 1 }); // Function attributes has precedence against api ones
+    expect(client[method]('key', param, null)).toEqual({ func_attr_bool: false, func_attr_str: 'false' }); // If the getTreatment function is called without attributes, stored attributes will be used to evaluate.
+    expect(client[method]('key', param)).toEqual({ func_attr_bool: false, func_attr_str: 'false' }); // If the getTreatment function is called without attributes, stored attributes will be used to evaluate.
     expect(client.clearAttributes()).toEqual(true);
-
-  });
-
-  test('Evaluation attributes logic and precedence / getTreatments', () => {
-
-    // If the same attribute is “cached” and provided on the function, the value received on the function call takes precedence.
-    expect(client.getTreatments('key', ['split'])).toEqual(undefined); // Nothing changes if no attributes were provided using the new api
-    expect(client.getTreatments('key', ['split'], { func_attr_bool: true, func_attr_str: 'true' })).toEqual({ func_attr_bool: true, func_attr_str: 'true' }); // Nothing changes if no attributes were provided using the new api
-    expect(client.getAttributes()).toEqual({}); // Attributes in memory storage must be empty
-    client.setAttribute('func_attr_bool', false);
-    expect(client.getAttributes()).toEqual({ 'func_attr_bool': false }); // In memory attribute storage must have the unique stored attribute
-    expect(client.getTreatments('key', ['split'], { func_attr_bool: true, func_attr_str: 'true' })).toEqual({ func_attr_bool: true, func_attr_str: 'true' }); // Function attributes has precedence against api ones
-    // @ts-ignore
-    expect(client.getTreatments('key', ['split'], null)).toEqual({ func_attr_bool: false }); // API attributes should be kept in memory and use for evaluations
-    expect(client.getTreatments('key', ['split'], { func_attr_str: 'true' })).toEqual({ func_attr_bool: false, func_attr_str: 'true' }); // API attributes should be kept in memory and use for evaluations
-    client.setAttributes({ func_attr_str: 'false' });
-    expect(client.getAttributes()).toEqual({ 'func_attr_bool': false, 'func_attr_str': 'false' }); // In memory attribute storage must have two stored attributes
-    expect(client.getTreatments('key', ['split'], { func_attr_bool: true, func_attr_str: 'true', func_attr_number: 1 })).toEqual({ func_attr_bool: true, func_attr_str: 'true', func_attr_number: 1 }); // Function attributes has precedence against api ones
-    // @ts-ignore
-    expect(client.getTreatments('key', ['split'], null)).toEqual({ func_attr_bool: false, func_attr_str: 'false' }); // If the getTreatment function is called without attributes, stored attributes will be used to evaluate.
-    expect(client.getTreatments('key', ['split'])).toEqual({ func_attr_bool: false, func_attr_str: 'false' }); // If the getTreatment function is called without attributes, stored attributes will be used to evaluate.
-    expect(client.clearAttributes()).toEqual(true);
-
-  });
-
-  test('Evaluation attributes logic and precedence / getTreatmentWithConfig', () => {
-
-    // If the same attribute is “cached” and provided on the function, the value received on the function call takes precedence.
-    expect(client.getTreatmentWithConfig('key', 'split')).toEqual(undefined); // Nothing changes if no attributes were provided using the new api
-    expect(client.getTreatmentWithConfig('key', 'split', { func_attr_bool: true, func_attr_str: 'true' })).toEqual({ func_attr_bool: true, func_attr_str: 'true' }); // Nothing changes if no attributes were provided using the new api
-    expect(client.getAttributes()).toEqual({}); // Attributes in memory storage must be empty
-    client.setAttribute('func_attr_bool', false);
-    expect(client.getAttributes()).toEqual({ 'func_attr_bool': false }); // In memory attribute storage must have the unique stored attribute
-    expect(client.getTreatmentWithConfig('key', 'split', { func_attr_bool: true, func_attr_str: 'true' })).toEqual({ func_attr_bool: true, func_attr_str: 'true' }); // Function attributes has precedence against api ones
-    // @ts-ignore
-    expect(client.getTreatmentWithConfig('key', 'split', null)).toEqual({ func_attr_bool: false }); // API attributes should be kept in memory and use for evaluations
-    expect(client.getTreatmentWithConfig('key', 'split', { func_attr_str: 'true' })).toEqual({ func_attr_bool: false, func_attr_str: 'true' }); // API attributes should be kept in memory and use for evaluations
-    client.setAttributes({ func_attr_str: 'false' });
-    expect(client.getAttributes()).toEqual({ 'func_attr_bool': false, 'func_attr_str': 'false' }); // In memory attribute storage must have two stored attributes
-    expect(client.getTreatmentWithConfig('key', 'split', { func_attr_bool: true, func_attr_str: 'true', func_attr_number: 1 })).toEqual({ func_attr_bool: true, func_attr_str: 'true', func_attr_number: 1 }); // Function attributes has precedence against api ones
-    // @ts-ignore
-    expect(client.getTreatmentWithConfig('key', 'split', null)).toEqual({ func_attr_bool: false, func_attr_str: 'false' }); // If the getTreatment function is called without attributes, stored attributes will be used to evaluate.
-    expect(client.getTreatmentWithConfig('key', 'split')).toEqual({ func_attr_bool: false, func_attr_str: 'false' }); // If the getTreatment function is called without attributes, stored attributes will be used to evaluate.
-    expect(client.clearAttributes()).toEqual(true);
-
-  });
-
-  test('Evaluation attributes logic and precedence / getTreatmentsWithConfig', () => {
-
-    // If the same attribute is “cached” and provided on the function, the value received on the function call takes precedence.
-    expect(client.getTreatmentsWithConfig('key', ['split'])).toEqual(undefined); // Nothing changes if no attributes were provided using the new api
-    expect(client.getTreatmentsWithConfig('key', ['split'], { func_attr_bool: true, func_attr_str: 'true' })).toEqual({ func_attr_bool: true, func_attr_str: 'true' }); // Nothing changes if no attributes were provided using the new api
-    expect(client.getAttributes()).toEqual({}); // Attributes in memory storage must be empty
-    client.setAttribute('func_attr_bool', false);
-    expect(client.getAttributes()).toEqual({ 'func_attr_bool': false }); // In memory attribute storage must have the unique stored attribute
-    expect(client.getTreatmentsWithConfig('key', ['split'], { func_attr_bool: true, func_attr_str: 'true' })).toEqual({ func_attr_bool: true, func_attr_str: 'true' }); // Function attributes has precedence against api ones
-    // @ts-ignore
-    expect(client.getTreatmentsWithConfig('key', ['split'], null)).toEqual({ func_attr_bool: false }); // API attributes should be kept in memory and use for evaluations
-    expect(client.getTreatmentsWithConfig('key', ['split'], { func_attr_str: 'true' })).toEqual({ func_attr_bool: false, func_attr_str: 'true' }); // API attributes should be kept in memory and use for evaluations
-    client.setAttributes({ func_attr_str: 'false' });
-    expect(client.getAttributes()).toEqual({ 'func_attr_bool': false, 'func_attr_str': 'false' }); // In memory attribute storage must have two stored attributes
-    expect(client.getTreatmentsWithConfig('key', ['split'], { func_attr_bool: true, func_attr_str: 'true', func_attr_number: 1 })).toEqual({ func_attr_bool: true, func_attr_str: 'true', func_attr_number: 1 }); // Function attributes has precedence against api ones
-    // @ts-ignore
-    expect(client.getTreatmentsWithConfig('key', ['split'], null)).toEqual({ func_attr_bool: false, func_attr_str: 'false' }); // If the getTreatment function is called without attributes, stored attributes will be used to evaluate.
-    expect(client.getTreatmentsWithConfig('key', ['split'])).toEqual({ func_attr_bool: false, func_attr_str: 'false' }); // If the getTreatment function is called without attributes, stored attributes will be used to evaluate.
-    client.clearAttributes();
-
-  });
-
-  test('Evaluation attributes logic and precedence / getTreatmentsByFlagSets', () => {
-
-    // If the same attribute is “cached” and provided on the function, the value received on the function call takes precedence.
-    expect(client.getTreatmentsByFlagSets('key', ['set'])).toEqual(undefined); // Nothing changes if no attributes were provided using the new api
-    expect(client.getTreatmentsByFlagSets('key', ['set'], { func_attr_bool: true, func_attr_str: 'true' })).toEqual({ func_attr_bool: true, func_attr_str: 'true' }); // Nothing changes if no attributes were provided using the new api
-    expect(client.getAttributes()).toEqual({}); // Attributes in memory storage must be empty
-    client.setAttribute('func_attr_bool', false);
-    expect(client.getAttributes()).toEqual({ 'func_attr_bool': false }); // In memory attribute storage must have the unique stored attribute
-    expect(client.getTreatmentsByFlagSets('key', ['set'], { func_attr_bool: true, func_attr_str: 'true' })).toEqual({ func_attr_bool: true, func_attr_str: 'true' }); // Function attributes has precedence against api ones
-    // @ts-ignore
-    expect(client.getTreatmentsByFlagSets('key', ['set'], null)).toEqual({ func_attr_bool: false }); // API attributes should be kept in memory and use for evaluations
-    expect(client.getTreatmentsByFlagSets('key', ['set'], { func_attr_str: 'true' })).toEqual({ func_attr_bool: false, func_attr_str: 'true' }); // API attributes should be kept in memory and use for evaluations
-    client.setAttributes({ func_attr_str: 'false' });
-    expect(client.getAttributes()).toEqual({ 'func_attr_bool': false, 'func_attr_str': 'false' }); // In memory attribute storage must have two stored attributes
-    expect(client.getTreatmentsByFlagSets('key', ['set'], { func_attr_bool: true, func_attr_str: 'true', func_attr_number: 1 })).toEqual({ func_attr_bool: true, func_attr_str: 'true', func_attr_number: 1 }); // Function attributes has precedence against api ones
-    // @ts-ignore
-    expect(client.getTreatmentsByFlagSets('key', ['set'], null)).toEqual({ func_attr_bool: false, func_attr_str: 'false' }); // If the getTreatment function is called without attributes, stored attributes will be used to evaluate.
-    expect(client.getTreatmentsByFlagSets('key', ['set'])).toEqual({ func_attr_bool: false, func_attr_str: 'false' }); // If the getTreatment function is called without attributes, stored attributes will be used to evaluate.
-    client.clearAttributes();
-
-  });
-
-  test('Evaluation attributes logic and precedence / getTreatmentsWithConfigByFlagSets', () => {
-
-    // If the same attribute is “cached” and provided on the function, the value received on the function call takes precedence.
-    expect(client.getTreatmentsWithConfigByFlagSets('key', ['set'])).toEqual(undefined); // Nothing changes if no attributes were provided using the new api
-    expect(client.getTreatmentsWithConfigByFlagSets('key', ['set'], { func_attr_bool: true, func_attr_str: 'true' })).toEqual({ func_attr_bool: true, func_attr_str: 'true' }); // Nothing changes if no attributes were provided using the new api
-    expect(client.getAttributes()).toEqual({}); // Attributes in memory storage must be empty
-    client.setAttribute('func_attr_bool', false);
-    expect(client.getAttributes()).toEqual({ 'func_attr_bool': false }); // In memory attribute storage must have the unique stored attribute
-    expect(client.getTreatmentsWithConfigByFlagSets('key', ['set'], { func_attr_bool: true, func_attr_str: 'true' })).toEqual({ func_attr_bool: true, func_attr_str: 'true' }); // Function attributes has precedence against api ones
-    // @ts-ignore
-    expect(client.getTreatmentsWithConfigByFlagSets('key', ['set'], null)).toEqual({ func_attr_bool: false }); // API attributes should be kept in memory and use for evaluations
-    expect(client.getTreatmentsWithConfigByFlagSets('key', ['set'], { func_attr_str: 'true' })).toEqual({ func_attr_bool: false, func_attr_str: 'true' }); // API attributes should be kept in memory and use for evaluations
-    client.setAttributes({ func_attr_str: 'false' });
-    expect(client.getAttributes()).toEqual({ 'func_attr_bool': false, 'func_attr_str': 'false' }); // In memory attribute storage must have two stored attributes
-    expect(client.getTreatmentsWithConfigByFlagSets('key', ['set'], { func_attr_bool: true, func_attr_str: 'true', func_attr_number: 1 })).toEqual({ func_attr_bool: true, func_attr_str: 'true', func_attr_number: 1 }); // Function attributes has precedence against api ones
-    // @ts-ignore
-    expect(client.getTreatmentsWithConfigByFlagSets('key', ['set'], null)).toEqual({ func_attr_bool: false, func_attr_str: 'false' }); // If the getTreatment function is called without attributes, stored attributes will be used to evaluate.
-    expect(client.getTreatmentsWithConfigByFlagSets('key', ['set'])).toEqual({ func_attr_bool: false, func_attr_str: 'false' }); // If the getTreatment function is called without attributes, stored attributes will be used to evaluate.
-    client.clearAttributes();
-
-  });
-
-  test('Evaluation attributes logic and precedence / getTreatmentsByFlagSet', () => {
-
-    // If the same attribute is “cached” and provided on the function, the value received on the function call takes precedence.
-    expect(client.getTreatmentsByFlagSet('key', 'set')).toEqual(undefined); // Nothing changes if no attributes were provided using the new api
-    expect(client.getTreatmentsByFlagSet('key', 'set', { func_attr_bool: true, func_attr_str: 'true' })).toEqual({ func_attr_bool: true, func_attr_str: 'true' }); // Nothing changes if no attributes were provided using the new api
-    expect(client.getAttributes()).toEqual({}); // Attributes in memory storage must be empty
-    client.setAttribute('func_attr_bool', false);
-    expect(client.getAttributes()).toEqual({ 'func_attr_bool': false }); // In memory attribute storage must have the unique stored attribute
-    expect(client.getTreatmentsByFlagSet('key', 'set', { func_attr_bool: true, func_attr_str: 'true' })).toEqual({ func_attr_bool: true, func_attr_str: 'true' }); // Function attributes has precedence against api ones
-    // @ts-ignore
-    expect(client.getTreatmentsByFlagSet('key', 'set', null)).toEqual({ func_attr_bool: false }); // API attributes should be kept in memory and use for evaluations
-    expect(client.getTreatmentsByFlagSet('key', 'set', { func_attr_str: 'true' })).toEqual({ func_attr_bool: false, func_attr_str: 'true' }); // API attributes should be kept in memory and use for evaluations
-    client.setAttributes({ func_attr_str: 'false' });
-    expect(client.getAttributes()).toEqual({ 'func_attr_bool': false, 'func_attr_str': 'false' }); // In memory attribute storage must have two stored attributes
-    expect(client.getTreatmentsByFlagSet('key', 'set', { func_attr_bool: true, func_attr_str: 'true', func_attr_number: 1 })).toEqual({ func_attr_bool: true, func_attr_str: 'true', func_attr_number: 1 }); // Function attributes has precedence against api ones
-    // @ts-ignore
-    expect(client.getTreatmentsByFlagSet('key', 'set', null)).toEqual({ func_attr_bool: false, func_attr_str: 'false' }); // If the getTreatment function is called without attributes, stored attributes will be used to evaluate.
-    expect(client.getTreatmentsByFlagSet('key', 'set')).toEqual({ func_attr_bool: false, func_attr_str: 'false' }); // If the getTreatment function is called without attributes, stored attributes will be used to evaluate.
-    client.clearAttributes();
-
-  });
-
-  test('Evaluation attributes logic and precedence / getTreatmentsWithConfigByFlagSet', () => {
-
-    // If the same attribute is “cached” and provided on the function, the value received on the function call takes precedence.
-    expect(client.getTreatmentsWithConfigByFlagSet('key', 'set')).toEqual(undefined); // Nothing changes if no attributes were provided using the new api
-    expect(client.getTreatmentsWithConfigByFlagSet('key', 'set', { func_attr_bool: true, func_attr_str: 'true' })).toEqual({ func_attr_bool: true, func_attr_str: 'true' }); // Nothing changes if no attributes were provided using the new api
-    expect(client.getAttributes()).toEqual({}); // Attributes in memory storage must be empty
-    client.setAttribute('func_attr_bool', false);
-    expect(client.getAttributes()).toEqual({ 'func_attr_bool': false }); // In memory attribute storage must have the unique stored attribute
-    expect(client.getTreatmentsWithConfigByFlagSet('key', 'set', { func_attr_bool: true, func_attr_str: 'true' })).toEqual({ func_attr_bool: true, func_attr_str: 'true' }); // Function attributes has precedence against api ones
-    // @ts-ignore
-    expect(client.getTreatmentsWithConfigByFlagSet('key', 'set', null)).toEqual({ func_attr_bool: false }); // API attributes should be kept in memory and use for evaluations
-    expect(client.getTreatmentsWithConfigByFlagSet('key', 'set', { func_attr_str: 'true' })).toEqual({ func_attr_bool: false, func_attr_str: 'true' }); // API attributes should be kept in memory and use for evaluations
-    client.setAttributes({ func_attr_str: 'false' });
-    expect(client.getAttributes()).toEqual({ 'func_attr_bool': false, 'func_attr_str': 'false' }); // In memory attribute storage must have two stored attributes
-    expect(client.getTreatmentsWithConfigByFlagSet('key', 'set', { func_attr_bool: true, func_attr_str: 'true', func_attr_number: 1 })).toEqual({ func_attr_bool: true, func_attr_str: 'true', func_attr_number: 1 }); // Function attributes has precedence against api ones
-    // @ts-ignore
-    expect(client.getTreatmentsWithConfigByFlagSet('key', 'set', null)).toEqual({ func_attr_bool: false, func_attr_str: 'false' }); // If the getTreatment function is called without attributes, stored attributes will be used to evaluate.
-    expect(client.getTreatmentsWithConfigByFlagSet('key', 'set')).toEqual({ func_attr_bool: false, func_attr_str: 'false' }); // If the getTreatment function is called without attributes, stored attributes will be used to evaluate.
-    client.clearAttributes();
-
   });
 
 });
diff --git a/src/sdkClient/__tests__/clientInputValidation.spec.ts b/src/sdkClient/__tests__/clientInputValidation.spec.ts
index 0664c179..f70845f7 100644
--- a/src/sdkClient/__tests__/clientInputValidation.spec.ts
+++ b/src/sdkClient/__tests__/clientInputValidation.spec.ts
@@ -3,13 +3,15 @@ import { clientInputValidationDecorator } from '../clientInputValidation';
 
 // Mocks
 import { DebugLogger } from '../../logger/browser/DebugLogger';
+import { createClientMock } from './testUtils';
 
 const settings: any = {
   log: DebugLogger(),
   sync: { __splitFiltersValidation: { groupedFilters: { bySet: [] } } }
 };
 
-const client: any = {};
+const EVALUATION_RESULT = 'on';
+const client: any = createClientMock(EVALUATION_RESULT);
 
 const readinessManager: any = {
   isReady: () => true,
@@ -52,4 +54,54 @@ describe('clientInputValidationDecorator', () => {
     // @TODO should be 8, but there is an additional log from `getTreatmentsByFlagSet` and `getTreatmentsWithConfigByFlagSet` that should be removed
     expect(logSpy).toBeCalledTimes(10);
   });
+
+  test('should evaluate but log an error if the passed 4th argument (evaluation options) is invalid', () => {
+    expect(clientWithValidation.getTreatment('key', 'ff', undefined, 'invalid')).toBe(EVALUATION_RESULT);
+    expect(logSpy).toHaveBeenLastCalledWith('[ERROR] splitio => getTreatment: evaluation options must be a plain object.');
+    expect(client.getTreatment).toBeCalledWith('key', 'ff', undefined, undefined);
+
+    expect(clientWithValidation.getTreatmentWithConfig('key', 'ff', undefined, { properties: 'invalid' })).toBe(EVALUATION_RESULT);
+    expect(logSpy).toHaveBeenLastCalledWith('[ERROR] splitio => getTreatmentWithConfig: properties must be a plain object.');
+    expect(client.getTreatmentWithConfig).toBeCalledWith('key', 'ff', undefined, undefined);
+
+    expect(clientWithValidation.getTreatments('key', ['ff'], undefined, { properties: 'invalid' })).toBe(EVALUATION_RESULT);
+    expect(logSpy).toHaveBeenLastCalledWith('[ERROR] splitio => getTreatments: properties must be a plain object.');
+    expect(client.getTreatments).toBeCalledWith('key', ['ff'], undefined, undefined);
+
+    expect(clientWithValidation.getTreatmentsWithConfig('key', ['ff'], {}, { properties: true })).toBe(EVALUATION_RESULT);
+    expect(logSpy).toHaveBeenLastCalledWith('[ERROR] splitio => getTreatmentsWithConfig: properties must be a plain object.');
+    expect(client.getTreatmentsWithConfig).toBeCalledWith('key', ['ff'], {}, undefined);
+
+    expect(clientWithValidation.getTreatmentsByFlagSet('key', 'flagSet', undefined, { properties: 'invalid' })).toBe(EVALUATION_RESULT);
+    expect(logSpy).toHaveBeenLastCalledWith('[ERROR] splitio => getTreatmentsByFlagSet: properties must be a plain object.');
+    expect(client.getTreatmentsByFlagSet).toBeCalledWith('key', 'flagset', undefined, undefined);
+
+    expect(clientWithValidation.getTreatmentsWithConfigByFlagSet('key', 'flagSet', {}, { properties: 'invalid' })).toBe(EVALUATION_RESULT);
+    expect(logSpy).toBeCalledWith('[ERROR] splitio => getTreatmentsWithConfigByFlagSet: properties must be a plain object.');
+    expect(client.getTreatmentsWithConfigByFlagSet).toBeCalledWith('key', 'flagset', {}, undefined);
+
+    expect(clientWithValidation.getTreatmentsByFlagSets('key', ['flagSet'], undefined, { properties: 'invalid' })).toBe(EVALUATION_RESULT);
+    expect(logSpy).toHaveBeenLastCalledWith('[ERROR] splitio => getTreatmentsByFlagSets: properties must be a plain object.');
+    expect(client.getTreatmentsByFlagSets).toBeCalledWith('key', ['flagset'], undefined, undefined);
+
+    expect(clientWithValidation.getTreatmentsWithConfigByFlagSets('key', ['flagSet'], {}, { properties: 'invalid' })).toBe(EVALUATION_RESULT);
+    expect(logSpy).toHaveBeenLastCalledWith('[ERROR] splitio => getTreatmentsWithConfigByFlagSets: properties must be a plain object.');
+    expect(client.getTreatmentsWithConfigByFlagSets).toBeCalledWith('key', ['flagset'], {}, undefined);
+  });
+
+  test('should sanitize the properties in the 4th argument', () => {
+    expect(clientWithValidation.getTreatment('key', 'ff', undefined, { properties: { toSanitize: /asd/, correct: 100 }})).toBe(EVALUATION_RESULT);
+    expect(logSpy).toHaveBeenLastCalledWith('[WARN]  splitio => getTreatment: Property "toSanitize" is of invalid type. Setting value to null.');
+    expect(client.getTreatment).toBeCalledWith('key', 'ff', undefined, { properties: { toSanitize: null, correct: 100 }});
+  });
+
+  test('should ignore the properties in the 4th argument if an empty object is passed', () => {
+    expect(clientWithValidation.getTreatment('key', 'ff', undefined, { properties: {} })).toBe(EVALUATION_RESULT);
+    expect(client.getTreatment).toHaveBeenLastCalledWith('key', 'ff', undefined, undefined);
+
+    expect(clientWithValidation.getTreatment('key', 'ff', undefined, { properties: undefined })).toBe(EVALUATION_RESULT);
+    expect(client.getTreatment).toHaveBeenLastCalledWith('key', 'ff', undefined, undefined);
+
+    expect(logSpy).not.toBeCalled();
+  });
 });
diff --git a/src/sdkClient/__tests__/testUtils.ts b/src/sdkClient/__tests__/testUtils.ts
index 901897e3..dab0085a 100644
--- a/src/sdkClient/__tests__/testUtils.ts
+++ b/src/sdkClient/__tests__/testUtils.ts
@@ -8,3 +8,18 @@ export function assertClientApi(client: any, sdkStatus?: object) {
     expect(typeof client[method]).toBe('function');
   });
 }
+
+export function createClientMock(returnValue: any) {
+
+  return {
+    getTreatment: jest.fn(()=> returnValue),
+    getTreatmentWithConfig: jest.fn(()=> returnValue),
+    getTreatments: jest.fn(()=> returnValue),
+    getTreatmentsWithConfig: jest.fn(()=> returnValue),
+    getTreatmentsByFlagSets: jest.fn(()=> returnValue),
+    getTreatmentsWithConfigByFlagSets: jest.fn(()=> returnValue),
+    getTreatmentsByFlagSet: jest.fn(()=> returnValue),
+    getTreatmentsWithConfigByFlagSet: jest.fn(()=> returnValue),
+    track: jest.fn(()=> returnValue),
+  };
+}
diff --git a/src/sdkClient/client.ts b/src/sdkClient/client.ts
index 1139a272..0e526f72 100644
--- a/src/sdkClient/client.ts
+++ b/src/sdkClient/client.ts
@@ -23,6 +23,14 @@ function treatmentsNotReady(featureFlagNames: string[]) {
   return evaluations;
 }
 
+function stringify(options?: SplitIO.EvaluationOptions) {
+  if (options && options.properties) {
+    try {
+      return JSON.stringify(options.properties);
+    } catch { /* JSON.stringify should never throw with validated options, but handling just in case */ }
+  }
+}
+
 /**
  * Creator of base client with getTreatments and track methods.
  */
@@ -31,12 +39,12 @@ export function clientFactory(params: ISdkFactoryContext): SplitIO.IClient | Spl
   const { log, mode } = settings;
   const isAsync = isConsumerMode(mode);
 
-  function getTreatment(key: SplitIO.SplitKey, featureFlagName: string, attributes: SplitIO.Attributes | undefined, withConfig = false, methodName = GET_TREATMENT) {
+  function getTreatment(key: SplitIO.SplitKey, featureFlagName: string, attributes?: SplitIO.Attributes, options?: SplitIO.EvaluationOptions, withConfig = false, methodName = GET_TREATMENT) {
     const stopTelemetryTracker = telemetryTracker.trackEval(withConfig ? TREATMENT_WITH_CONFIG : TREATMENT);
 
     const wrapUp = (evaluationResult: IEvaluationResult) => {
       const queue: ImpressionDecorated[] = [];
-      const treatment = processEvaluation(evaluationResult, featureFlagName, key, attributes, withConfig, methodName, queue);
+      const treatment = processEvaluation(evaluationResult, featureFlagName, key, stringify(options), withConfig, methodName, queue);
       impressionsTracker.track(queue, attributes);
 
       stopTelemetryTracker(queue[0] && queue[0].imp.label);
@@ -52,18 +60,19 @@ export function clientFactory(params: ISdkFactoryContext): SplitIO.IClient | Spl
     return thenable(evaluation) ? evaluation.then((res) => wrapUp(res)) : wrapUp(evaluation);
   }
 
-  function getTreatmentWithConfig(key: SplitIO.SplitKey, featureFlagName: string, attributes: SplitIO.Attributes | undefined) {
-    return getTreatment(key, featureFlagName, attributes, true, GET_TREATMENT_WITH_CONFIG);
+  function getTreatmentWithConfig(key: SplitIO.SplitKey, featureFlagName: string, attributes?: SplitIO.Attributes, options?: SplitIO.EvaluationOptions) {
+    return getTreatment(key, featureFlagName, attributes, options, true, GET_TREATMENT_WITH_CONFIG);
   }
 
-  function getTreatments(key: SplitIO.SplitKey, featureFlagNames: string[], attributes: SplitIO.Attributes | undefined, withConfig = false, methodName = GET_TREATMENTS) {
+  function getTreatments(key: SplitIO.SplitKey, featureFlagNames: string[], attributes?: SplitIO.Attributes, options?: SplitIO.EvaluationOptions, withConfig = false, methodName = GET_TREATMENTS) {
     const stopTelemetryTracker = telemetryTracker.trackEval(withConfig ? TREATMENTS_WITH_CONFIG : TREATMENTS);
 
     const wrapUp = (evaluationResults: Record<string, IEvaluationResult>) => {
       const queue: ImpressionDecorated[] = [];
-      const treatments: Record<string, SplitIO.Treatment | SplitIO.TreatmentWithConfig> = {};
+      const treatments: SplitIO.Treatments | SplitIO.TreatmentsWithConfig = {};
+      const properties = stringify(options);
       Object.keys(evaluationResults).forEach(featureFlagName => {
-        treatments[featureFlagName] = processEvaluation(evaluationResults[featureFlagName], featureFlagName, key, attributes, withConfig, methodName, queue);
+        treatments[featureFlagName] = processEvaluation(evaluationResults[featureFlagName], featureFlagName, key, properties, withConfig, methodName, queue);
       });
       impressionsTracker.track(queue, attributes);
 
@@ -80,19 +89,19 @@ export function clientFactory(params: ISdkFactoryContext): SplitIO.IClient | Spl
     return thenable(evaluations) ? evaluations.then((res) => wrapUp(res)) : wrapUp(evaluations);
   }
 
-  function getTreatmentsWithConfig(key: SplitIO.SplitKey, featureFlagNames: string[], attributes: SplitIO.Attributes | undefined) {
-    return getTreatments(key, featureFlagNames, attributes, true, GET_TREATMENTS_WITH_CONFIG);
+  function getTreatmentsWithConfig(key: SplitIO.SplitKey, featureFlagNames: string[], attributes?: SplitIO.Attributes, options?: SplitIO.EvaluationOptions) {
+    return getTreatments(key, featureFlagNames, attributes, options, true, GET_TREATMENTS_WITH_CONFIG);
   }
 
-  function getTreatmentsByFlagSets(key: SplitIO.SplitKey, flagSetNames: string[], attributes: SplitIO.Attributes | undefined, withConfig = false, method: Method = TREATMENTS_BY_FLAGSETS, methodName = GET_TREATMENTS_BY_FLAG_SETS) {
+  function getTreatmentsByFlagSets(key: SplitIO.SplitKey, flagSetNames: string[], attributes?: SplitIO.Attributes, options?: SplitIO.EvaluationOptions, withConfig = false, method: Method = TREATMENTS_BY_FLAGSETS, methodName = GET_TREATMENTS_BY_FLAG_SETS) {
     const stopTelemetryTracker = telemetryTracker.trackEval(method);
 
     const wrapUp = (evaluationResults: Record<string, IEvaluationResult>) => {
       const queue: ImpressionDecorated[] = [];
-      const treatments: Record<string, SplitIO.Treatment | SplitIO.TreatmentWithConfig> = {};
-      const evaluations = evaluationResults;
-      Object.keys(evaluations).forEach(featureFlagName => {
-        treatments[featureFlagName] = processEvaluation(evaluations[featureFlagName], featureFlagName, key, attributes, withConfig, methodName, queue);
+      const treatments: SplitIO.Treatments | SplitIO.TreatmentsWithConfig = {};
+      const properties = stringify(options);
+      Object.keys(evaluationResults).forEach(featureFlagName => {
+        treatments[featureFlagName] = processEvaluation(evaluationResults[featureFlagName], featureFlagName, key, properties, withConfig, methodName, queue);
       });
       impressionsTracker.track(queue, attributes);
 
@@ -109,16 +118,16 @@ export function clientFactory(params: ISdkFactoryContext): SplitIO.IClient | Spl
     return thenable(evaluations) ? evaluations.then((res) => wrapUp(res)) : wrapUp(evaluations);
   }
 
-  function getTreatmentsWithConfigByFlagSets(key: SplitIO.SplitKey, flagSetNames: string[], attributes: SplitIO.Attributes | undefined) {
-    return getTreatmentsByFlagSets(key, flagSetNames, attributes, true, TREATMENTS_WITH_CONFIG_BY_FLAGSETS, GET_TREATMENTS_WITH_CONFIG_BY_FLAG_SETS);
+  function getTreatmentsWithConfigByFlagSets(key: SplitIO.SplitKey, flagSetNames: string[], attributes?: SplitIO.Attributes, options?: SplitIO.EvaluationOptions) {
+    return getTreatmentsByFlagSets(key, flagSetNames, attributes, options, true, TREATMENTS_WITH_CONFIG_BY_FLAGSETS, GET_TREATMENTS_WITH_CONFIG_BY_FLAG_SETS);
   }
 
-  function getTreatmentsByFlagSet(key: SplitIO.SplitKey, flagSetName: string, attributes: SplitIO.Attributes | undefined) {
-    return getTreatmentsByFlagSets(key, [flagSetName], attributes, false, TREATMENTS_BY_FLAGSET, GET_TREATMENTS_BY_FLAG_SET);
+  function getTreatmentsByFlagSet(key: SplitIO.SplitKey, flagSetName: string, attributes?: SplitIO.Attributes, options?: SplitIO.EvaluationOptions) {
+    return getTreatmentsByFlagSets(key, [flagSetName], attributes, options, false, TREATMENTS_BY_FLAGSET, GET_TREATMENTS_BY_FLAG_SET);
   }
 
-  function getTreatmentsWithConfigByFlagSet(key: SplitIO.SplitKey, flagSetName: string, attributes: SplitIO.Attributes | undefined) {
-    return getTreatmentsByFlagSets(key, [flagSetName], attributes, true, TREATMENTS_WITH_CONFIG_BY_FLAGSET, GET_TREATMENTS_WITH_CONFIG_BY_FLAG_SET);
+  function getTreatmentsWithConfigByFlagSet(key: SplitIO.SplitKey, flagSetName: string, attributes?: SplitIO.Attributes, options?: SplitIO.EvaluationOptions) {
+    return getTreatmentsByFlagSets(key, [flagSetName], attributes, options, true, TREATMENTS_WITH_CONFIG_BY_FLAGSET, GET_TREATMENTS_WITH_CONFIG_BY_FLAG_SET);
   }
 
   // Internal function
@@ -126,7 +135,7 @@ export function clientFactory(params: ISdkFactoryContext): SplitIO.IClient | Spl
     evaluation: IEvaluationResult,
     featureFlagName: string,
     key: SplitIO.SplitKey,
-    attributes: SplitIO.Attributes | undefined,
+    properties: string | undefined,
     withConfig: boolean,
     invokingMethodName: string,
     queue: ImpressionDecorated[]
@@ -148,6 +157,7 @@ export function clientFactory(params: ISdkFactoryContext): SplitIO.IClient | Spl
           bucketingKey,
           label,
           changeNumber: changeNumber as number,
+          properties
         },
         disabled: impressionsDisabled
       });
diff --git a/src/sdkClient/clientAttributesDecoration.ts b/src/sdkClient/clientAttributesDecoration.ts
index cf31b5d3..b9a901db 100644
--- a/src/sdkClient/clientAttributesDecoration.ts
+++ b/src/sdkClient/clientAttributesDecoration.ts
@@ -20,50 +20,44 @@ export function clientAttributesDecoration<TClient extends SplitIO.IClient | Spl
   const clientGetTreatmentsWithConfigByFlagSets = client.getTreatmentsWithConfigByFlagSets;
   const clientGetTreatmentsByFlagSet = client.getTreatmentsByFlagSet;
   const clientGetTreatmentsWithConfigByFlagSet = client.getTreatmentsWithConfigByFlagSet;
-  const clientTrack = client.track;
 
-  function getTreatment(maybeKey: SplitIO.SplitKey, maybeFeatureFlagName: string, maybeAttributes?: SplitIO.Attributes) {
-    return clientGetTreatment(maybeKey, maybeFeatureFlagName, combineAttributes(maybeAttributes));
+  function getTreatment(maybeKey: SplitIO.SplitKey, maybeFeatureFlagName: string, maybeAttributes?: SplitIO.Attributes, maybeOptions?: SplitIO.EvaluationOptions) {
+    return clientGetTreatment(maybeKey, maybeFeatureFlagName, combineAttributes(maybeAttributes), maybeOptions);
   }
 
-  function getTreatmentWithConfig(maybeKey: SplitIO.SplitKey, maybeFeatureFlagName: string, maybeAttributes?: SplitIO.Attributes) {
-    return clientGetTreatmentWithConfig(maybeKey, maybeFeatureFlagName, combineAttributes(maybeAttributes));
+  function getTreatmentWithConfig(maybeKey: SplitIO.SplitKey, maybeFeatureFlagName: string, maybeAttributes?: SplitIO.Attributes, maybeOptions?: SplitIO.EvaluationOptions) {
+    return clientGetTreatmentWithConfig(maybeKey, maybeFeatureFlagName, combineAttributes(maybeAttributes), maybeOptions);
   }
 
-  function getTreatments(maybeKey: SplitIO.SplitKey, maybeFeatureFlagNames: string[], maybeAttributes?: SplitIO.Attributes) {
-    return clientGetTreatments(maybeKey, maybeFeatureFlagNames, combineAttributes(maybeAttributes));
+  function getTreatments(maybeKey: SplitIO.SplitKey, maybeFeatureFlagNames: string[], maybeAttributes?: SplitIO.Attributes, maybeOptions?: SplitIO.EvaluationOptions) {
+    return clientGetTreatments(maybeKey, maybeFeatureFlagNames, combineAttributes(maybeAttributes), maybeOptions);
   }
 
-  function getTreatmentsWithConfig(maybeKey: SplitIO.SplitKey, maybeFeatureFlagNames: string[], maybeAttributes?: SplitIO.Attributes) {
-    return clientGetTreatmentsWithConfig(maybeKey, maybeFeatureFlagNames, combineAttributes(maybeAttributes));
+  function getTreatmentsWithConfig(maybeKey: SplitIO.SplitKey, maybeFeatureFlagNames: string[], maybeAttributes?: SplitIO.Attributes, maybeOptions?: SplitIO.EvaluationOptions) {
+    return clientGetTreatmentsWithConfig(maybeKey, maybeFeatureFlagNames, combineAttributes(maybeAttributes), maybeOptions);
   }
 
-  function getTreatmentsByFlagSets(maybeKey: SplitIO.SplitKey, maybeFlagSets: string[], maybeAttributes?: SplitIO.Attributes) {
-    return clientGetTreatmentsByFlagSets(maybeKey, maybeFlagSets, combineAttributes(maybeAttributes));
+  function getTreatmentsByFlagSets(maybeKey: SplitIO.SplitKey, maybeFlagSets: string[], maybeAttributes?: SplitIO.Attributes, maybeOptions?: SplitIO.EvaluationOptions) {
+    return clientGetTreatmentsByFlagSets(maybeKey, maybeFlagSets, combineAttributes(maybeAttributes), maybeOptions);
   }
 
-  function getTreatmentsWithConfigByFlagSets(maybeKey: SplitIO.SplitKey, maybeFlagSets: string[], maybeAttributes?: SplitIO.Attributes) {
-    return clientGetTreatmentsWithConfigByFlagSets(maybeKey, maybeFlagSets, combineAttributes(maybeAttributes));
+  function getTreatmentsWithConfigByFlagSets(maybeKey: SplitIO.SplitKey, maybeFlagSets: string[], maybeAttributes?: SplitIO.Attributes, maybeOptions?: SplitIO.EvaluationOptions) {
+    return clientGetTreatmentsWithConfigByFlagSets(maybeKey, maybeFlagSets, combineAttributes(maybeAttributes), maybeOptions);
   }
 
-  function getTreatmentsByFlagSet(maybeKey: SplitIO.SplitKey, maybeFlagSet: string, maybeAttributes?: SplitIO.Attributes) {
-    return clientGetTreatmentsByFlagSet(maybeKey, maybeFlagSet, combineAttributes(maybeAttributes));
+  function getTreatmentsByFlagSet(maybeKey: SplitIO.SplitKey, maybeFlagSet: string, maybeAttributes?: SplitIO.Attributes, maybeOptions?: SplitIO.EvaluationOptions) {
+    return clientGetTreatmentsByFlagSet(maybeKey, maybeFlagSet, combineAttributes(maybeAttributes), maybeOptions);
   }
 
-  function getTreatmentsWithConfigByFlagSet(maybeKey: SplitIO.SplitKey, maybeFlagSet: string, maybeAttributes?: SplitIO.Attributes) {
-    return clientGetTreatmentsWithConfigByFlagSet(maybeKey, maybeFlagSet, combineAttributes(maybeAttributes));
+  function getTreatmentsWithConfigByFlagSet(maybeKey: SplitIO.SplitKey, maybeFlagSet: string, maybeAttributes?: SplitIO.Attributes, maybeOptions?: SplitIO.EvaluationOptions) {
+    return clientGetTreatmentsWithConfigByFlagSet(maybeKey, maybeFlagSet, combineAttributes(maybeAttributes), maybeOptions);
   }
 
-  function track(maybeKey: SplitIO.SplitKey, maybeTT: string, maybeEvent: string, maybeEventValue?: number, maybeProperties?: SplitIO.Properties) {
-    return clientTrack(maybeKey, maybeTT, maybeEvent, maybeEventValue, maybeProperties);
-  }
-
-  function combineAttributes(maybeAttributes: SplitIO.Attributes | undefined): SplitIO.Attributes | undefined{
+  function combineAttributes(maybeAttributes: SplitIO.Attributes | undefined): SplitIO.Attributes | undefined {
     const storedAttributes = attributeStorage.getAll();
-    if (Object.keys(storedAttributes).length > 0) {
-      return objectAssign({}, storedAttributes, maybeAttributes);
-    }
-    return maybeAttributes;
+    return Object.keys(storedAttributes).length > 0 ?
+      objectAssign({}, storedAttributes, maybeAttributes) :
+      maybeAttributes;
   }
 
   return objectAssign(client, {
@@ -75,7 +69,6 @@ export function clientAttributesDecoration<TClient extends SplitIO.IClient | Spl
     getTreatmentsWithConfigByFlagSets: getTreatmentsWithConfigByFlagSets,
     getTreatmentsByFlagSet: getTreatmentsByFlagSet,
     getTreatmentsWithConfigByFlagSet: getTreatmentsWithConfigByFlagSet,
-    track: track,
 
     /**
      * Add an attribute to client's in memory attributes storage
diff --git a/src/sdkClient/clientInputValidation.ts b/src/sdkClient/clientInputValidation.ts
index e7fb9db1..40765d41 100644
--- a/src/sdkClient/clientInputValidation.ts
+++ b/src/sdkClient/clientInputValidation.ts
@@ -9,7 +9,8 @@ import {
   validateSplits,
   validateTrafficType,
   validateIfNotDestroyed,
-  validateIfOperational
+  validateIfOperational,
+  validateEvaluationOptions
 } from '../utils/inputValidation';
 import { startsWith } from '../utils/lang';
 import { CONTROL, CONTROL_WITH_CONFIG, GET_TREATMENT, GET_TREATMENTS, GET_TREATMENTS_BY_FLAG_SET, GET_TREATMENTS_BY_FLAG_SETS, GET_TREATMENTS_WITH_CONFIG, GET_TREATMENTS_WITH_CONFIG_BY_FLAG_SET, GET_TREATMENTS_WITH_CONFIG_BY_FLAG_SETS, GET_TREATMENT_WITH_CONFIG, TRACK_FN_LABEL } from '../utils/constants';
@@ -32,7 +33,7 @@ export function clientInputValidationDecorator<TClient extends SplitIO.IClient |
   /**
    * Avoid repeating this validations code
    */
-  function validateEvaluationParams(maybeKey: SplitIO.SplitKey, maybeNameOrNames: string | string[], maybeAttributes: SplitIO.Attributes | undefined, methodName: string) {
+  function validateEvaluationParams(methodName: string, maybeKey: SplitIO.SplitKey, maybeNameOrNames: string | string[], maybeAttributes?: SplitIO.Attributes, maybeOptions?: SplitIO.EvaluationOptions) {
     const key = validateKey(log, maybeKey, methodName);
 
     const nameOrNames = methodName.indexOf('ByFlagSet') > -1 ?
@@ -43,6 +44,7 @@ export function clientInputValidationDecorator<TClient extends SplitIO.IClient |
 
     const attributes = validateAttributes(log, maybeAttributes, methodName);
     const isNotDestroyed = validateIfNotDestroyed(log, readinessManager, methodName);
+    const options = validateEvaluationOptions(log, maybeOptions, methodName);
 
     validateIfOperational(log, readinessManager, methodName, nameOrNames);
 
@@ -52,7 +54,8 @@ export function clientInputValidationDecorator<TClient extends SplitIO.IClient |
       valid,
       key,
       nameOrNames,
-      attributes
+      attributes,
+      options
     };
   }
 
@@ -60,31 +63,31 @@ export function clientInputValidationDecorator<TClient extends SplitIO.IClient |
     return isAsync ? Promise.resolve(value) : value;
   }
 
-  function getTreatment(maybeKey: SplitIO.SplitKey, maybeFeatureFlagName: string, maybeAttributes?: SplitIO.Attributes) {
-    const params = validateEvaluationParams(maybeKey, maybeFeatureFlagName, maybeAttributes, GET_TREATMENT);
+  function getTreatment(maybeKey: SplitIO.SplitKey, maybeFeatureFlagName: string, maybeAttributes?: SplitIO.Attributes, maybeOptions?: SplitIO.EvaluationOptions) {
+    const params = validateEvaluationParams(GET_TREATMENT, maybeKey, maybeFeatureFlagName, maybeAttributes, maybeOptions);
 
     if (params.valid) {
-      return client.getTreatment(params.key as SplitIO.SplitKey, params.nameOrNames as string, params.attributes as SplitIO.Attributes | undefined);
+      return client.getTreatment(params.key as SplitIO.SplitKey, params.nameOrNames as string, params.attributes as SplitIO.Attributes | undefined, params.options);
     } else {
       return wrapResult(CONTROL);
     }
   }
 
-  function getTreatmentWithConfig(maybeKey: SplitIO.SplitKey, maybeFeatureFlagName: string, maybeAttributes?: SplitIO.Attributes) {
-    const params = validateEvaluationParams(maybeKey, maybeFeatureFlagName, maybeAttributes, GET_TREATMENT_WITH_CONFIG);
+  function getTreatmentWithConfig(maybeKey: SplitIO.SplitKey, maybeFeatureFlagName: string, maybeAttributes?: SplitIO.Attributes, maybeOptions?: SplitIO.EvaluationOptions) {
+    const params = validateEvaluationParams(GET_TREATMENT_WITH_CONFIG, maybeKey, maybeFeatureFlagName, maybeAttributes, maybeOptions);
 
     if (params.valid) {
-      return client.getTreatmentWithConfig(params.key as SplitIO.SplitKey, params.nameOrNames as string, params.attributes as SplitIO.Attributes | undefined);
+      return client.getTreatmentWithConfig(params.key as SplitIO.SplitKey, params.nameOrNames as string, params.attributes as SplitIO.Attributes | undefined, params.options);
     } else {
       return wrapResult(objectAssign({}, CONTROL_WITH_CONFIG));
     }
   }
 
-  function getTreatments(maybeKey: SplitIO.SplitKey, maybeFeatureFlagNames: string[], maybeAttributes?: SplitIO.Attributes) {
-    const params = validateEvaluationParams(maybeKey, maybeFeatureFlagNames, maybeAttributes, GET_TREATMENTS);
+  function getTreatments(maybeKey: SplitIO.SplitKey, maybeFeatureFlagNames: string[], maybeAttributes?: SplitIO.Attributes, maybeOptions?: SplitIO.EvaluationOptions) {
+    const params = validateEvaluationParams(GET_TREATMENTS, maybeKey, maybeFeatureFlagNames, maybeAttributes, maybeOptions);
 
     if (params.valid) {
-      return client.getTreatments(params.key as SplitIO.SplitKey, params.nameOrNames as string[], params.attributes as SplitIO.Attributes | undefined);
+      return client.getTreatments(params.key as SplitIO.SplitKey, params.nameOrNames as string[], params.attributes as SplitIO.Attributes | undefined, params.options);
     } else {
       const res: SplitIO.Treatments = {};
       if (params.nameOrNames) (params.nameOrNames as string[]).forEach((split: string) => res[split] = CONTROL);
@@ -93,11 +96,11 @@ export function clientInputValidationDecorator<TClient extends SplitIO.IClient |
     }
   }
 
-  function getTreatmentsWithConfig(maybeKey: SplitIO.SplitKey, maybeFeatureFlagNames: string[], maybeAttributes?: SplitIO.Attributes) {
-    const params = validateEvaluationParams(maybeKey, maybeFeatureFlagNames, maybeAttributes, GET_TREATMENTS_WITH_CONFIG);
+  function getTreatmentsWithConfig(maybeKey: SplitIO.SplitKey, maybeFeatureFlagNames: string[], maybeAttributes?: SplitIO.Attributes, maybeOptions?: SplitIO.EvaluationOptions) {
+    const params = validateEvaluationParams(GET_TREATMENTS_WITH_CONFIG, maybeKey, maybeFeatureFlagNames, maybeAttributes, maybeOptions);
 
     if (params.valid) {
-      return client.getTreatmentsWithConfig(params.key as SplitIO.SplitKey, params.nameOrNames as string[], params.attributes as SplitIO.Attributes | undefined);
+      return client.getTreatmentsWithConfig(params.key as SplitIO.SplitKey, params.nameOrNames as string[], params.attributes as SplitIO.Attributes | undefined, params.options);
     } else {
       const res: SplitIO.TreatmentsWithConfig = {};
       if (params.nameOrNames) (params.nameOrNames as string[]).forEach(split => res[split] = objectAssign({}, CONTROL_WITH_CONFIG));
@@ -106,41 +109,41 @@ export function clientInputValidationDecorator<TClient extends SplitIO.IClient |
     }
   }
 
-  function getTreatmentsByFlagSets(maybeKey: SplitIO.SplitKey, maybeFlagSets: string[], maybeAttributes?: SplitIO.Attributes) {
-    const params = validateEvaluationParams(maybeKey, maybeFlagSets, maybeAttributes, GET_TREATMENTS_BY_FLAG_SETS);
+  function getTreatmentsByFlagSets(maybeKey: SplitIO.SplitKey, maybeFlagSets: string[], maybeAttributes?: SplitIO.Attributes, maybeOptions?: SplitIO.EvaluationOptions) {
+    const params = validateEvaluationParams(GET_TREATMENTS_BY_FLAG_SETS, maybeKey, maybeFlagSets, maybeAttributes, maybeOptions);
 
     if (params.valid) {
-      return client.getTreatmentsByFlagSets(params.key as SplitIO.SplitKey, params.nameOrNames as string[], params.attributes as SplitIO.Attributes | undefined);
+      return client.getTreatmentsByFlagSets(params.key as SplitIO.SplitKey, params.nameOrNames as string[], params.attributes as SplitIO.Attributes | undefined, params.options);
     } else {
       return wrapResult({});
     }
   }
 
-  function getTreatmentsWithConfigByFlagSets(maybeKey: SplitIO.SplitKey, maybeFlagSets: string[], maybeAttributes?: SplitIO.Attributes) {
-    const params = validateEvaluationParams(maybeKey, maybeFlagSets, maybeAttributes, GET_TREATMENTS_WITH_CONFIG_BY_FLAG_SETS);
+  function getTreatmentsWithConfigByFlagSets(maybeKey: SplitIO.SplitKey, maybeFlagSets: string[], maybeAttributes?: SplitIO.Attributes, maybeOptions?: SplitIO.EvaluationOptions) {
+    const params = validateEvaluationParams(GET_TREATMENTS_WITH_CONFIG_BY_FLAG_SETS, maybeKey, maybeFlagSets, maybeAttributes, maybeOptions);
 
     if (params.valid) {
-      return client.getTreatmentsWithConfigByFlagSets(params.key as SplitIO.SplitKey, params.nameOrNames as string[], params.attributes as SplitIO.Attributes | undefined);
+      return client.getTreatmentsWithConfigByFlagSets(params.key as SplitIO.SplitKey, params.nameOrNames as string[], params.attributes as SplitIO.Attributes | undefined, params.options);
     } else {
       return wrapResult({});
     }
   }
 
-  function getTreatmentsByFlagSet(maybeKey: SplitIO.SplitKey, maybeFlagSet: string, maybeAttributes?: SplitIO.Attributes) {
-    const params = validateEvaluationParams(maybeKey, [maybeFlagSet], maybeAttributes, GET_TREATMENTS_BY_FLAG_SET);
+  function getTreatmentsByFlagSet(maybeKey: SplitIO.SplitKey, maybeFlagSet: string, maybeAttributes?: SplitIO.Attributes, maybeOptions?: SplitIO.EvaluationOptions) {
+    const params = validateEvaluationParams(GET_TREATMENTS_BY_FLAG_SET, maybeKey, [maybeFlagSet], maybeAttributes, maybeOptions);
 
     if (params.valid) {
-      return client.getTreatmentsByFlagSet(params.key as SplitIO.SplitKey, (params.nameOrNames as string[])[0], params.attributes as SplitIO.Attributes | undefined);
+      return client.getTreatmentsByFlagSet(params.key as SplitIO.SplitKey, (params.nameOrNames as string[])[0], params.attributes as SplitIO.Attributes | undefined, params.options);
     } else {
       return wrapResult({});
     }
   }
 
-  function getTreatmentsWithConfigByFlagSet(maybeKey: SplitIO.SplitKey, maybeFlagSet: string, maybeAttributes?: SplitIO.Attributes) {
-    const params = validateEvaluationParams(maybeKey, [maybeFlagSet], maybeAttributes, GET_TREATMENTS_WITH_CONFIG_BY_FLAG_SET);
+  function getTreatmentsWithConfigByFlagSet(maybeKey: SplitIO.SplitKey, maybeFlagSet: string, maybeAttributes?: SplitIO.Attributes, maybeOptions?: SplitIO.EvaluationOptions) {
+    const params = validateEvaluationParams(GET_TREATMENTS_WITH_CONFIG_BY_FLAG_SET, maybeKey, [maybeFlagSet], maybeAttributes, maybeOptions);
 
     if (params.valid) {
-      return client.getTreatmentsWithConfigByFlagSet(params.key as SplitIO.SplitKey, (params.nameOrNames as string[])[0], params.attributes as SplitIO.Attributes | undefined);
+      return client.getTreatmentsWithConfigByFlagSet(params.key as SplitIO.SplitKey, (params.nameOrNames as string[])[0], params.attributes as SplitIO.Attributes | undefined, params.options);
     } else {
       return wrapResult({});
     }
diff --git a/src/storages/utils.ts b/src/storages/utils.ts
index 2963bbc5..49b21690 100644
--- a/src/storages/utils.ts
+++ b/src/storages/utils.ts
@@ -30,6 +30,7 @@ export function impressionsToJSON(impressions: SplitIO.ImpressionDTO[], metadata
         c: impression.changeNumber,
         m: impression.time,
         pt: impression.pt,
+        properties: impression.properties
       }
     };
 
diff --git a/src/sync/submitters/impressionsSubmitter.ts b/src/sync/submitters/impressionsSubmitter.ts
index 193e2703..bf05a587 100644
--- a/src/sync/submitters/impressionsSubmitter.ts
+++ b/src/sync/submitters/impressionsSubmitter.ts
@@ -25,8 +25,9 @@ export function fromImpressionsCollector(sendLabels: boolean, data: SplitIO.Impr
           m: entry.time, // Timestamp
           c: entry.changeNumber, // ChangeNumber
           r: sendLabels ? entry.label : undefined, // Rule
-          b: entry.bucketingKey ? entry.bucketingKey : undefined, // Bucketing Key
-          pt: entry.pt ? entry.pt : undefined // Previous time
+          b: entry.bucketingKey, // Bucketing Key
+          pt: entry.pt, // Previous time
+          properties: entry.properties // Properties
         };
 
         return keyImpression;
diff --git a/src/sync/submitters/types.ts b/src/sync/submitters/types.ts
index f3b93c4d..9bae212e 100644
--- a/src/sync/submitters/types.ts
+++ b/src/sync/submitters/types.ts
@@ -3,26 +3,30 @@ import { IMetadata } from '../../dtos/types';
 import SplitIO from '../../../types/splitio';
 import { ISyncTask } from '../types';
 
+type ImpressionPayload = {
+  /** Matching Key */
+  k: string;
+  /** Bucketing Key */
+  b?: string;
+  /** Treatment */
+  t: string;
+  /** Timestamp */
+  m: number;
+  /** Change number */
+  c: number;
+  /** Rule label */
+  r?: string;
+  /** Previous time */
+  pt?: number;
+  /** Stringified JSON object with properties */
+  properties?: string;
+};
+
 export type ImpressionsPayload = {
   /** Split name */
   f: string,
   /** Key Impressions */
-  i: {
-    /** User Key */
-    k: string;
-    /** Treatment */
-    t: string;
-    /** Timestamp */
-    m: number;
-    /** ChangeNumber */
-    c: number;
-    /** Rule label */
-    r?: string;
-    /** Bucketing Key */
-    b?: string;
-    /** Previous time */
-    pt?: number;
-  }[]
+  i: ImpressionPayload[]
 }[]
 
 export type ImpressionCountsPayload = {
@@ -60,23 +64,9 @@ export type StoredImpressionWithMetadata = {
   /** Metadata */
   m: IMetadata,
   /** Stored impression */
-  i: {
-    /** keyName */
-    k: string,
-    /** bucketingKey */
-    b?: string,
-    /** Split name */
-    f: string,
-    /** treatment */
-    t: string,
-    /** label */
-    r: string,
-    /** changeNumber */
-    c: number,
-    /** time */
-    m: number
-    /** previous time */
-    pt?: number
+  i: ImpressionPayload & {
+    /** Feature flag name */
+    f: string
   }
 }
 
diff --git a/src/trackers/strategy/strategyDebug.ts b/src/trackers/strategy/strategyDebug.ts
index 65bc06b3..ae19973e 100644
--- a/src/trackers/strategy/strategyDebug.ts
+++ b/src/trackers/strategy/strategyDebug.ts
@@ -14,6 +14,8 @@ export function strategyDebugFactory(
 
   return {
     process(impression: SplitIO.ImpressionDTO) {
+      if (impression.properties) return true;
+
       impression.pt = impressionsObserver.testAndSet(impression);
       return true;
     }
diff --git a/src/trackers/strategy/strategyOptimized.ts b/src/trackers/strategy/strategyOptimized.ts
index 9a9cf883..24c82ebd 100644
--- a/src/trackers/strategy/strategyOptimized.ts
+++ b/src/trackers/strategy/strategyOptimized.ts
@@ -18,6 +18,9 @@ export function strategyOptimizedFactory(
 
   return {
     process(impression: SplitIO.ImpressionDTO) {
+      // DEBUG mode without previous time, for impressions with properties
+      if (impression.properties) return true;
+
       impression.pt = impressionsObserver.testAndSet(impression);
 
       const now = Date.now();
diff --git a/src/utils/inputValidation/eventProperties.ts b/src/utils/inputValidation/eventProperties.ts
index 310946cc..1306431c 100644
--- a/src/utils/inputValidation/eventProperties.ts
+++ b/src/utils/inputValidation/eventProperties.ts
@@ -66,3 +66,13 @@ export function validateEventProperties(log: ILogger, maybeProperties: any, meth
 
   return output;
 }
+
+export function validateEvaluationOptions(log: ILogger, maybeOptions: any, method: string): SplitIO.EvaluationOptions | undefined {
+  if (isObject(maybeOptions)) {
+    const properties = validateEventProperties(log, maybeOptions.properties, method).properties;
+    return properties && Object.keys(properties).length > 0 ? { properties } : undefined;
+  } else if (maybeOptions) {
+    log.error(ERROR_NOT_PLAIN_OBJECT, [method, 'evaluation options']);
+  }
+  return undefined;
+}
diff --git a/src/utils/inputValidation/index.ts b/src/utils/inputValidation/index.ts
index 93b09ab7..96cf4be6 100644
--- a/src/utils/inputValidation/index.ts
+++ b/src/utils/inputValidation/index.ts
@@ -11,3 +11,4 @@ export { validateIfNotDestroyed, validateIfOperational } from './isOperational';
 export { validateSplitExistence } from './splitExistence';
 export { validateTrafficTypeExistence } from './trafficTypeExistence';
 export { validatePreloadedData } from './preloadedData';
+export { validateEvaluationOptions } from './eventProperties';
diff --git a/types/splitio.d.ts b/types/splitio.d.ts
index 0cab4b66..4102a7fc 100644
--- a/types/splitio.d.ts
+++ b/types/splitio.d.ts
@@ -778,6 +778,15 @@ declare namespace SplitIO {
   type Properties = {
     [propertyName: string]: string | number | boolean | null;
   };
+  /**
+   * Evaluation options object for getTreatment methods.
+   */
+  type EvaluationOptions = {
+    /**
+     * Optional properties to append to the generated impression object sent to Split backend.
+     */
+    properties?: Properties;
+  }
   /**
    * The SplitKey object format.
    */
@@ -803,14 +812,42 @@ declare namespace SplitIO {
    * Impression DTO generated by the SDK when processing evaluations.
    */
   type ImpressionDTO = {
+    /**
+     * Feature flag name.
+     */
     feature: string;
+    /**
+     * Key.
+     */
     keyName: string;
+    /**
+     * Treatment value.
+     */
     treatment: string;
+    /**
+     * Impression timestamp.
+     */
     time: number;
+    /**
+     * Bucketing Key
+     */
     bucketingKey?: string;
+    /**
+     * Rule label
+     */
     label: string;
+    /**
+     * Version of the feature flag
+     */
     changeNumber: number;
+    /**
+     * Previous time
+     */
     pt?: number;
+    /**
+     * JSON stringified version of the impression properties.
+     */
+    properties?: string;
   }
   /**
    * Object with information about an impression. It contains the generated impression DTO as well as
@@ -1514,73 +1551,80 @@ declare namespace SplitIO {
      * @param key - The string key representing the consumer.
      * @param featureFlagName - The string that represents the feature flag we want to get the treatment.
      * @param attributes - An object of type Attributes defining the attributes for the given key.
+     * @param options - An object of type EvaluationOptions for advanced evaluation options.
      * @returns The treatment string.
      */
-    getTreatment(key: SplitKey, featureFlagName: string, attributes?: Attributes): Treatment;
+    getTreatment(key: SplitKey, featureFlagName: string, attributes?: Attributes, options?: EvaluationOptions): Treatment;
     /**
      * Returns a TreatmentWithConfig value, which is an object with both treatment and config string for the given feature.
      *
      * @param key - The string key representing the consumer.
      * @param featureFlagName - The string that represents the feature flag we want to get the treatment.
      * @param attributes - An object of type Attributes defining the attributes for the given key.
-     * @returns The TreatmentWithConfig, the object containing the treatment string and the
-     *                                configuration stringified JSON (or null if there was no config for that treatment).
+     * @param options - An object of type EvaluationOptions for advanced evaluation options.
+     * @returns The TreatmentWithConfig object that contains the treatment string and the configuration stringified JSON (or null if there was no config for that treatment).
      */
-    getTreatmentWithConfig(key: SplitKey, featureFlagName: string, attributes?: Attributes): TreatmentWithConfig;
+    getTreatmentWithConfig(key: SplitKey, featureFlagName: string, attributes?: Attributes, options?: EvaluationOptions): TreatmentWithConfig;
     /**
      * Returns a Treatments value, which is an object map with the treatments for the given features.
      *
      * @param key - The string key representing the consumer.
      * @param featureFlagNames - An array of the feature flag names we want to get the treatments.
      * @param attributes - An object of type Attributes defining the attributes for the given key.
+     * @param options - An object of type EvaluationOptions for advanced evaluation options.
      * @returns The treatments object map.
      */
-    getTreatments(key: SplitKey, featureFlagNames: string[], attributes?: Attributes): Treatments;
+    getTreatments(key: SplitKey, featureFlagNames: string[], attributes?: Attributes, options?: EvaluationOptions): Treatments;
     /**
      * Returns a TreatmentsWithConfig value, which is an object map with the TreatmentWithConfig (an object with both treatment and config string) for the given features.
      *
      * @param key - The string key representing the consumer.
      * @param featureFlagNames - An array of the feature flag names we want to get the treatments.
      * @param attributes - An object of type Attributes defining the attributes for the given key.
+     * @param options - An object of type EvaluationOptions for advanced evaluation options.
      * @returns The map with all the TreatmentWithConfig objects
      */
-    getTreatmentsWithConfig(key: SplitKey, featureFlagNames: string[], attributes?: Attributes): TreatmentsWithConfig;
+    getTreatmentsWithConfig(key: SplitKey, featureFlagNames: string[], attributes?: Attributes, options?: EvaluationOptions): TreatmentsWithConfig;
     /**
      * Returns a Treatments value, which is an object map with the treatments for the feature flags related to the given flag set.
      *
      * @param key - The string key representing the consumer.
      * @param flagSet - The flag set name we want to get the treatments.
      * @param attributes - An object of type Attributes defining the attributes for the given key.
+     * @param options - An object of type EvaluationOptions for advanced evaluation options.
      * @returns The map with all the Treatment objects
      */
-    getTreatmentsByFlagSet(key: SplitKey, flagSet: string, attributes?: Attributes): Treatments;
+    getTreatmentsByFlagSet(key: SplitKey, flagSet: string, attributes?: Attributes, options?: EvaluationOptions): Treatments;
     /**
      * Returns a TreatmentsWithConfig value, which is an object map with the TreatmentWithConfig (an object with both treatment and config string) for the feature flags related to the given flag set.
      *
      * @param key - The string key representing the consumer.
      * @param flagSet - The flag set name we want to get the treatments.
      * @param attributes - An object of type Attributes defining the attributes for the given key.
+     * @param options - An object of type EvaluationOptions for advanced evaluation options.
      * @returns The map with all the TreatmentWithConfig objects
      */
-    getTreatmentsWithConfigByFlagSet(key: SplitKey, flagSet: string, attributes?: Attributes): TreatmentsWithConfig;
+    getTreatmentsWithConfigByFlagSet(key: SplitKey, flagSet: string, attributes?: Attributes, options?: EvaluationOptions): TreatmentsWithConfig;
     /**
      * Returns a Returns a Treatments value, which is an object with both treatment and config string for to the feature flags related to the given flag sets.
      *
      * @param key - The string key representing the consumer.
      * @param flagSets - An array of the flag set names we want to get the treatments.
      * @param attributes - An object of type Attributes defining the attributes for the given key.
+     * @param options - An object of type EvaluationOptions for advanced evaluation options.
      * @returns The map with all the Treatment objects
      */
-    getTreatmentsByFlagSets(key: SplitKey, flagSets: string[], attributes?: Attributes): Treatments;
+    getTreatmentsByFlagSets(key: SplitKey, flagSets: string[], attributes?: Attributes, options?: EvaluationOptions): Treatments;
     /**
      * Returns a TreatmentsWithConfig value, which is an object map with the TreatmentWithConfig (an object with both treatment and config string) for the feature flags related to the given flag sets.
      *
      * @param key - The string key representing the consumer.
      * @param flagSets - An array of the flag set names we want to get the treatments.
      * @param attributes - An object of type Attributes defining the attributes for the given key.
+     * @param options - An object of type EvaluationOptions for advanced evaluation options.
      * @returns The map with all the TreatmentWithConfig objects
      */
-    getTreatmentsWithConfigByFlagSets(key: SplitKey, flagSets: string[], attributes?: Attributes): TreatmentsWithConfig;
+    getTreatmentsWithConfigByFlagSets(key: SplitKey, flagSets: string[], attributes?: Attributes, options?: EvaluationOptions): TreatmentsWithConfig;
     /**
      * Tracks an event to be fed to the results product on Split user interface.
      *
@@ -1605,72 +1649,80 @@ declare namespace SplitIO {
      * @param key - The string key representing the consumer.
      * @param featureFlagName - The string that represents the feature flag we want to get the treatment.
      * @param attributes - An object of type Attributes defining the attributes for the given key.
+     * @param options - An object of type EvaluationOptions for advanced evaluation options.
      * @returns Treatment promise that resolves to the treatment string.
      */
-    getTreatment(key: SplitKey, featureFlagName: string, attributes?: Attributes): AsyncTreatment;
+    getTreatment(key: SplitKey, featureFlagName: string, attributes?: Attributes, options?: EvaluationOptions): AsyncTreatment;
     /**
      * Returns a TreatmentWithConfig value, which will be (or eventually be) an object with both treatment and config string for the given feature.
      *
      * @param key - The string key representing the consumer.
      * @param featureFlagName - The string that represents the feature flag we want to get the treatment.
      * @param attributes - An object of type Attributes defining the attributes for the given key.
+     * @param options - An object of type EvaluationOptions for advanced evaluation options.
      * @returns TreatmentWithConfig promise that resolves to the TreatmentWithConfig object.
      */
-    getTreatmentWithConfig(key: SplitKey, featureFlagName: string, attributes?: Attributes): AsyncTreatmentWithConfig;
+    getTreatmentWithConfig(key: SplitKey, featureFlagName: string, attributes?: Attributes, options?: EvaluationOptions): AsyncTreatmentWithConfig;
     /**
      * Returns a Treatments value, which will be (or eventually be) an object map with the treatments for the given features.
      *
      * @param key - The string key representing the consumer.
      * @param featureFlagNames - An array of the feature flag names we want to get the treatments.
      * @param attributes - An object of type Attributes defining the attributes for the given key.
+     * @param options - An object of type EvaluationOptions for advanced evaluation options.
      * @returns Treatments promise that resolves to the treatments object map.
      */
-    getTreatments(key: SplitKey, featureFlagNames: string[], attributes?: Attributes): AsyncTreatments;
+    getTreatments(key: SplitKey, featureFlagNames: string[], attributes?: Attributes, options?: EvaluationOptions): AsyncTreatments;
     /**
      * Returns a TreatmentsWithConfig value, which will be (or eventually be) an object map with the TreatmentWithConfig (an object with both treatment and config string) for the given features.
      *
      * @param key - The string key representing the consumer.
      * @param featureFlagNames - An array of the feature flag names we want to get the treatments.
      * @param attributes - An object of type Attributes defining the attributes for the given key.
+     * @param options - An object of type EvaluationOptions for advanced evaluation options.
      * @returns TreatmentsWithConfig promise that resolves to the map of TreatmentsWithConfig objects.
      */
-    getTreatmentsWithConfig(key: SplitKey, featureFlagNames: string[], attributes?: Attributes): AsyncTreatmentsWithConfig;
+    getTreatmentsWithConfig(key: SplitKey, featureFlagNames: string[], attributes?: Attributes, options?: EvaluationOptions): AsyncTreatmentsWithConfig;
     /**
      * Returns a Treatments value, which is an object map with the treatments for the feature flags related to the given flag set.
      *
      * @param key - The string key representing the consumer.
      * @param flagSet - The flag set name we want to get the treatments.
      * @param attributes - An object of type Attributes defining the attributes for the given key.
+     * @param options - An object of type EvaluationOptions for advanced evaluation options.
      * @returns Treatments promise that resolves to the treatments object map.
      */
-    getTreatmentsByFlagSet(key: SplitKey, flagSet: string, attributes?: Attributes): AsyncTreatments;
+    getTreatmentsByFlagSet(key: SplitKey, flagSet: string, attributes?: Attributes, options?: EvaluationOptions): AsyncTreatments;
     /**
      * Returns a TreatmentsWithConfig value, which is an object map with the TreatmentWithConfig (an object with both treatment and config string) for the feature flags related to the given flag set.
      *
      * @param key - The string key representing the consumer.
      * @param flagSet - The flag set name we want to get the treatments.
      * @param attributes - An object of type Attributes defining the attributes for the given key.
+     * @param options - An object of type EvaluationOptions for advanced evaluation options.
      * @returns TreatmentsWithConfig promise that resolves to the map of TreatmentsWithConfig objects.
      */
-    getTreatmentsWithConfigByFlagSet(key: SplitKey, flagSet: string, attributes?: Attributes): AsyncTreatmentsWithConfig;
+    getTreatmentsWithConfigByFlagSet(key: SplitKey, flagSet: string, attributes?: Attributes, options?: EvaluationOptions): AsyncTreatmentsWithConfig;
     /**
      * Returns a Returns a Treatments value, which is an object with both treatment and config string for to the feature flags related to the given flag sets.
      *
      * @param key - The string key representing the consumer.
      * @param flagSets - An array of the flag set names we want to get the treatments.
      * @param attributes - An object of type Attributes defining the attributes for the given key.
+     * @param options - An object of type EvaluationOptions for advanced evaluation options.
      * @returns Treatments promise that resolves to the treatments object map.
      */
-    getTreatmentsByFlagSets(key: SplitKey, flagSets: string[], attributes?: Attributes): AsyncTreatments;
+    getTreatmentsByFlagSets(key: SplitKey, flagSets: string[], attributes?: Attributes, options?: EvaluationOptions): AsyncTreatments;
     /**
      * Returns a TreatmentsWithConfig value, which is an object map with the TreatmentWithConfig (an object with both treatment and config string) for the feature flags related to the given flag sets.
      *
      * @param key - The string key representing the consumer.
      * @param flagSets - An array of the flag set names we want to get the treatments.
      * @param attributes - An object of type Attributes defining the attributes for the given key.
+     * @param options - An object of type EvaluationOptions for advanced evaluation options.
      * @returns TreatmentsWithConfig promise that resolves to the map of TreatmentsWithConfig objects.
      */
-    getTreatmentsWithConfigByFlagSets(key: SplitKey, flagSets: string[], attributes?: Attributes): AsyncTreatmentsWithConfig;
+    getTreatmentsWithConfigByFlagSets(key: SplitKey, flagSets: string[], attributes?: Attributes, options?: EvaluationOptions): AsyncTreatmentsWithConfig;
     /**
      * Tracks an event to be fed to the results product on Split user interface, and returns a promise to signal when the event was successfully queued (or not).
      *
@@ -1735,65 +1787,73 @@ declare namespace SplitIO {
      *
      * @param featureFlagName - The string that represents the feature flag we want to get the treatment.
      * @param attributes - An object of type Attributes defining the attributes for the given key.
+     * @param options - An object of type EvaluationOptions for advanced evaluation options.
      * @returns The treatment string.
      */
-    getTreatment(featureFlagName: string, attributes?: Attributes): Treatment;
+    getTreatment(featureFlagName: string, attributes?: Attributes, options?: EvaluationOptions): Treatment;
     /**
      * Returns a TreatmentWithConfig value, which is an object with both treatment and config string for the given feature.
      *
      * @param featureFlagName - The string that represents the feature flag we want to get the treatment.
      * @param attributes - An object of type Attributes defining the attributes for the given key.
-     * @returns The map containing the treatment and the configuration stringified JSON (or null if there was no config for that treatment).
+     * @param options - An object of type EvaluationOptions for advanced evaluation options.
+     * @returns The TreatmentWithConfig object that contains the treatment string and the configuration stringified JSON (or null if there was no config for that treatment).
      */
-    getTreatmentWithConfig(featureFlagName: string, attributes?: Attributes): TreatmentWithConfig;
+    getTreatmentWithConfig(featureFlagName: string, attributes?: Attributes, options?: EvaluationOptions): TreatmentWithConfig;
     /**
      * Returns a Treatments value, which is an object map with the treatments for the given features.
      *
      * @param featureFlagNames - An array of the feature flag names we want to get the treatments.
      * @param attributes - An object of type Attributes defining the attributes for the given key.
+     * @param options - An object of type EvaluationOptions for advanced evaluation options.
      * @returns The treatments object map.
      */
-    getTreatments(featureFlagNames: string[], attributes?: Attributes): Treatments;
+    getTreatments(featureFlagNames: string[], attributes?: Attributes, options?: EvaluationOptions): Treatments;
     /**
      * Returns a TreatmentsWithConfig value, which is an object map with the TreatmentWithConfig (an object with both treatment and config string) for the given features.
      *
      * @param featureFlagNames - An array of the feature flag names we want to get the treatments.
      * @param attributes - An object of type Attributes defining the attributes for the given key.
+     * @param options - An object of type EvaluationOptions for advanced evaluation options.
      * @returns The map with all the TreatmentWithConfig objects
      */
-    getTreatmentsWithConfig(featureFlagNames: string[], attributes?: Attributes): TreatmentsWithConfig;
+    getTreatmentsWithConfig(featureFlagNames: string[], attributes?: Attributes, options?: EvaluationOptions): TreatmentsWithConfig;
     /**
      * Returns a Treatments value, which is an object map with the treatments for the feature flags related to the given flag set.
      *
      * @param flagSet - The flag set name we want to get the treatments.
      * @param attributes - An object of type Attributes defining the attributes for the given key.
+     * @param options - An object of type EvaluationOptions for advanced evaluation options.
      * @returns The map with all the Treatments objects
      */
-    getTreatmentsByFlagSet(flagSet: string, attributes?: Attributes): Treatments;
+    getTreatmentsByFlagSet(flagSet: string, attributes?: Attributes, options?: EvaluationOptions): Treatments;
     /**
      * Returns a TreatmentsWithConfig value, which is an object map with the TreatmentWithConfig (an object with both treatment and config string) for the feature flags related to the given flag set.
      *
      * @param flagSet - The flag set name we want to get the treatments.
      * @param attributes - An object of type Attributes defining the attributes for the given key.
+     * @param options - An object of type EvaluationOptions for advanced evaluation options.
      * @returns The map with all the TreatmentWithConfig objects
      */
-    getTreatmentsWithConfigByFlagSet(flagSet: string, attributes?: Attributes): TreatmentsWithConfig;
+    getTreatmentsWithConfigByFlagSet(flagSet: string, attributes?: Attributes, options?: EvaluationOptions): TreatmentsWithConfig;
     /**
      * Returns a Returns a Treatments value, which is an object with both treatment and config string for to the feature flags related to the given flag sets.
      *
      * @param flagSets - An array of the flag set names we want to get the treatments.
      * @param attributes - An object of type Attributes defining the attributes for the given key.
+     * @param options - An object of type EvaluationOptions for advanced evaluation options.
      * @returns The map with all the Treatments objects
      */
-    getTreatmentsByFlagSets(flagSets: string[], attributes?: Attributes): Treatments;
+    getTreatmentsByFlagSets(flagSets: string[], attributes?: Attributes, options?: EvaluationOptions): Treatments;
     /**
      * Returns a TreatmentsWithConfig value, which is an object map with the TreatmentWithConfig (an object with both treatment and config string) for the feature flags related to the given flag sets.
      *
      * @param flagSets - An array of the flag set names we want to get the treatments.
      * @param attributes - An object of type Attributes defining the attributes for the given key.
+     * @param options - An object of type EvaluationOptions for advanced evaluation options.
      * @returns The map with all the TreatmentWithConfig objects
      */
-    getTreatmentsWithConfigByFlagSets(flagSets: string[], attributes?: Attributes): TreatmentsWithConfig;
+    getTreatmentsWithConfigByFlagSets(flagSets: string[], attributes?: Attributes, options?: EvaluationOptions): TreatmentsWithConfig;
     /**
      * Tracks an event to be fed to the results product on Split user interface.
      *
@@ -1814,65 +1874,73 @@ declare namespace SplitIO {
      *
      * @param featureFlagName - The string that represents the feature flag we want to get the treatment.
      * @param attributes - An object of type Attributes defining the attributes for the given key.
+     * @param options - An object of type EvaluationOptions for advanced evaluation options.
      * @returns Treatment promise that resolves to the treatment string.
      */
-    getTreatment(featureFlagName: string, attributes?: Attributes): AsyncTreatment;
+    getTreatment(featureFlagName: string, attributes?: Attributes, options?: EvaluationOptions): AsyncTreatment;
     /**
      * Returns a TreatmentWithConfig value, which will be (or eventually be) an object with both treatment and config string for the given feature.
      *
      * @param featureFlagName - The string that represents the feature flag we want to get the treatment.
      * @param attributes - An object of type Attributes defining the attributes for the given key.
+     * @param options - An object of type EvaluationOptions for advanced evaluation options.
      * @returns TreatmentWithConfig promise that resolves to the TreatmentWithConfig object.
      */
-    getTreatmentWithConfig(featureFlagName: string, attributes?: Attributes): AsyncTreatmentWithConfig;
+    getTreatmentWithConfig(featureFlagName: string, attributes?: Attributes, options?: EvaluationOptions): AsyncTreatmentWithConfig;
     /**
      * Returns a Treatments value, which will be (or eventually be) an object map with the treatments for the given features.
      *
      * @param featureFlagNames - An array of the feature flag names we want to get the treatments.
      * @param attributes - An object of type Attributes defining the attributes for the given key.
+     * @param options - An object of type EvaluationOptions for advanced evaluation options.
      * @returns Treatments promise that resolves to the treatments object map.
      */
-    getTreatments(featureFlagNames: string[], attributes?: Attributes): AsyncTreatments;
+    getTreatments(featureFlagNames: string[], attributes?: Attributes, options?: EvaluationOptions): AsyncTreatments;
     /**
      * Returns a TreatmentsWithConfig value, which will be (or eventually be) an object map with the TreatmentWithConfig (an object with both treatment and config string) for the given features.
      *
      * @param featureFlagNames - An array of the feature flag names we want to get the treatments.
      * @param attributes - An object of type Attributes defining the attributes for the given key.
+     * @param options - An object of type EvaluationOptions for advanced evaluation options.
      * @returns TreatmentsWithConfig promise that resolves to the TreatmentsWithConfig object.
      */
-    getTreatmentsWithConfig(featureFlagNames: string[], attributes?: Attributes): AsyncTreatmentsWithConfig;
+    getTreatmentsWithConfig(featureFlagNames: string[], attributes?: Attributes, options?: EvaluationOptions): AsyncTreatmentsWithConfig;
     /**
      * Returns a Treatments value, which is an object map with the treatments for the feature flags related to the given flag set.
      *
      * @param flagSet - The flag set name we want to get the treatments.
      * @param attributes - An object of type Attributes defining the attributes for the given key.
+     * @param options - An object of type EvaluationOptions for advanced evaluation options.
      * @returns Treatments promise that resolves to the treatments object map.
      */
-    getTreatmentsByFlagSet(flagSet: string, attributes?: Attributes): AsyncTreatments;
+    getTreatmentsByFlagSet(flagSet: string, attributes?: Attributes, options?: EvaluationOptions): AsyncTreatments;
     /**
      * Returns a TreatmentsWithConfig value, which is an object map with the TreatmentWithConfig (an object with both treatment and config string) for the feature flags related to the given flag set.
      *
      * @param flagSet - The flag set name we want to get the treatments.
      * @param attributes - An object of type Attributes defining the attributes for the given key.
+     * @param options - An object of type EvaluationOptions for advanced evaluation options.
      * @returns TreatmentsWithConfig promise that resolves to the TreatmentsWithConfig object.
      */
-    getTreatmentsWithConfigByFlagSet(flagSet: string, attributes?: Attributes): AsyncTreatmentsWithConfig;
+    getTreatmentsWithConfigByFlagSet(flagSet: string, attributes?: Attributes, options?: EvaluationOptions): AsyncTreatmentsWithConfig;
     /**
      * Returns a Returns a Treatments value, which is an object with both treatment and config string for to the feature flags related to the given flag sets.
      *
      * @param flagSets - An array of the flag set names we want to get the treatments.
      * @param attributes - An object of type Attributes defining the attributes for the given key.
+     * @param options - An object of type EvaluationOptions for advanced evaluation options.
      * @returns Treatments promise that resolves to the treatments object map.
      */
-    getTreatmentsByFlagSets(flagSets: string[], attributes?: Attributes): AsyncTreatments;
+    getTreatmentsByFlagSets(flagSets: string[], attributes?: Attributes, options?: EvaluationOptions): AsyncTreatments;
     /**
      * Returns a TreatmentsWithConfig value, which is an object map with the TreatmentWithConfig (an object with both treatment and config string) for the feature flags related to the given flag sets.
      *
      * @param flagSets - An array of the flag set names we want to get the treatments.
      * @param attributes - An object of type Attributes defining the attributes for the given key.
+     * @param options - An object of type EvaluationOptions for advanced evaluation options.
      * @returns TreatmentsWithConfig promise that resolves to the TreatmentsWithConfig object.
      */
-    getTreatmentsWithConfigByFlagSets(flagSets: string[], attributes?: Attributes): AsyncTreatmentsWithConfig;
+    getTreatmentsWithConfigByFlagSets(flagSets: string[], attributes?: Attributes, options?: EvaluationOptions): AsyncTreatmentsWithConfig;
     /**
      * Tracks an event to be fed to the results product on Split user interface, and returns a promise to signal when the event was successfully queued (or not).
      *