Change Log

All notable changes to this project will be documented in this file.

The format is based on Keep a Changelog and this project adheres to Semantic Versioning.

[1.0.0] - July 31, 2026

Updated @optimizely/optimizely-sdk to version 6.x and migrated from the Lite API to the Universal API (createInstance, createStaticProjectConfigManager, createForwardingEventProcessor, createEventDispatcher).
Updated @fastly/js-compute to version 3.x and build directly to WebAssembly, removing the Webpack build step and core-js polyfill.
Replaced the uuid package with the native crypto.randomUUID() for user ID generation.
Updated the cookie package from 0.4.2 to 2.x and switched to its named v2 API (parseCookie, stringifySetCookie).
Externalized the SDK key: it is now read from a Fastly Config Store (optimizely) instead of being hardcoded in src/index.js.
Implemented graceful degradation so the service still responds if Optimizely initialization or a decision fails.
Improved datafile caching with a module-scope stale fallback layered on the Fastly edge CacheOverride cache, with a configurable TTL via the datafile_ttl_seconds Config Store key.
Added JSDoc documentation throughout the codebase.
Overhauled the README with a quick start, features, prerequisites, project structure, and troubleshooting.

New FastlyRequestHandler class implementing the Optimizely SDK request-handler interface over Fastly's fetch with named backends and CacheOverride.
New getOptimizelyClient and getDatafile helpers for client management and datafile fetching.
Unit test suite using Vitest (index.test.js, optimizely_helper.test.js, request_handler.test.js) with Fastly runtime mocks.
Biome configuration (biome.jsonc) for linting and formatting, and vitest.config.js for tests.
optimizely Config Store setup in fastly.toml for local development and deployment.

Removed the uuid package dependency (replaced with the native Web Crypto API).
Removed the Webpack build configuration (webpack.config.js).