chore: upgrade common lib and set release v3.18.1 (#277)

* Fix LocalStorageAssignmentShim reading localStorage["undefined"] during construction

Class field initializers for `size` and `[Symbol.toStringTag]` called
`this.getCache()` before the constructor body assigned `this.localStorageKey`,
causing `localStorage.getItem("undefined")`. If that key held non-JSON data,
`JSON.parse` threw and the SDK failed to initialize.

Convert both to getters so they no longer eagerly read localStorage during
construction. This also fixes a secondary bug where `size` was a stale
snapshot that never updated after mutations.

FFESUPPORT-610

Made-with: Cursor

* chore: bump version to 3.18.1 and use jest^29.x range, noting node 23 compat.

* upgrade js-common

* chore: commit latent docs changes

---------

Co-authored-by: bertilhatt <bertil.hatt@datadoghq.com>

Author: typotter

docs/js-client-sdk.loglevel.md

@@ -9,5 +9,5 @@ Valid log levels for the Eppo SDK logger.
 **Signature:**
 
 ```typescript
-export declare type LogLevel = 'trace' | 'debug' | 'info' | 'warn' | 'error' | 'silent';
+export type LogLevel = 'trace' | 'debug' | 'info' | 'warn' | 'error' | 'silent';
 ```

js-client-sdk.api.md

@@ -4,8 +4,6 @@
 
 ```ts
 
-/// <reference types="chrome" />
-
 import { AsyncMap } from '@eppo/js-client-sdk-common';
 import { Attributes } from '@eppo/js-client-sdk-common';
 import { AttributeType } from '@eppo/js-client-sdk-common';

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@eppo/js-client-sdk",
-  "version": "3.18.0",
+  "version": "3.18.1",
   "description": "Eppo SDK for client-side JavaScript applications",
   "main": "dist/index.js",
   "files": [
@@ -34,7 +34,7 @@
   "devDependencies": {
     "@microsoft/api-documenter": "^7.28.2",
     "@microsoft/api-extractor": "^7.48.1",
-    "@types/jest": "^29.5.11",
+    "@types/jest": "^29.5.14",
     "@types/spark-md5": "^3.0.5",
     "@typescript-eslint/eslint-plugin": "^5.13.0",
     "@typescript-eslint/parser": "^5.13.0",
@@ -59,10 +59,11 @@
     "webpack-cli": "^6.0.1"
   },
   "dependencies": {
-    "@eppo/js-client-sdk-common": "4.15.3",
+    "@eppo/js-client-sdk-common": "4.15.5",
     "@types/chrome": "^0.0.313",
     "lz-string": "^1.5.0"
   },
+  "//jest": "jest 30+ drops Node 23 support; pinned to ^29.x until we drop Node 23 from CI",
   "resolutions": {
     "//": "CVE-2025-7783: form-data package has a vulnerability that can be exploited to execute arbitrary code; GHSA-mh29-5h37-fv8m: js-yaml security vulnerability",
     "form-data": "^4.0.4",

yarn.lock

@@ -402,10 +402,10 @@
   dependencies:
     tslib "^2.4.0"
 
-"@eppo/js-client-sdk-common@4.15.3":
-  version "4.15.3"
-  resolved "https://registry.yarnpkg.com/@eppo/js-client-sdk-common/-/js-client-sdk-common-4.15.3.tgz#70fa31a240b5b482d3f0d654b16ec946525c26d2"
-  integrity sha512-boO/HetQAN5Qi+MAEzCetNteb+h5J4iC4qUcijaqlxLtWx2hUpAcAgRgUEQ4OpRtXSg3HjIgZWJzmhMj+zyYgg==
+"@eppo/js-client-sdk-common@4.15.5":
+  version "4.15.5"
+  resolved "https://registry.yarnpkg.com/@eppo/js-client-sdk-common/-/js-client-sdk-common-4.15.5.tgz#6ca7bb4d27bc2ae63ab4a97e25b15ff61be2777c"
+  integrity sha512-pRQG3fWiyOTAfjAvQ818aRMJryaDQXUNfcXzTy4czKFFBzPRTSUhaCDS1wGFU0zBLg2ZjMLBDt71km6q/wnztg==
   dependencies:
     buffer "npm:@eppo/buffer@6.2.0"
     js-base64 "^3.7.7"
@@ -1062,7 +1062,7 @@
   dependencies:
     "@types/istanbul-lib-report" "*"
 
-"@types/jest@^29.5.11":
+"@types/jest@^29.5.14":
   version "29.5.14"
   resolved "https://registry.yarnpkg.com/@types/jest/-/jest-29.5.14.tgz#2b910912fa1d6856cadcd0c1f95af7df1d6049e5"
   integrity sha512-ZN+4sdnLUbo8EVvVc2ao0GFW6oVrQRPn4K2lglySj7APvSrgzxHiNNK99us4WDMi57xxA2yggblIAMNhXOotLQ==