chore: Prepare for 4.0.0 release (optimizely#468)

Prepare for 4.0.0 release

Author: mjc1283

packages/optimizely-sdk/CHANGELOG.MD

@@ -7,6 +7,37 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 
 ## [Unreleased]
 
+## [4.0.0] - April 30, 2020
+
+### New Features
+
+- Removed lodash dependency
+- ES module entry point for the browser - `"module"` property of `package.json` points to `dist/optimizely.browser.es.min.js` ([#445](https://github.com/optimizely/javascript-sdk/pull/445))
+
+### Breaking Changes
+
+- Removed `Promise` polyfill from browser entry point ([417](https://github.com/optimizely/javascript-sdk/pull/417)).
+- Changed functionality of JSON schema validation in all entry points ([442](https://github.com/optimizely/javascript-sdk/pull/442)).
+  - Previously, `skipJSONValidation` flag was used by the user to specify whether the JSON object should be validated.
+  - Now, `skipJSONValidation` has been removed entirely from all entry points. Instead, a user will need to import `jsonSchemaValidator` from `@optimizely/optimizely-sdk/dist/optimizely.json_schema_validator.min.js` and pass it to `createInstance` to perform validation as shown below:
+  ```js
+  const optimizelySDK = require('@optimizely/optimizely-sdk');
+  const jsonSchemaValidator = require('@optimizely/optimizely-sdk/dist/optimizely.json_schema_validator.min');
+
+  // Require JSON schema validation for the datafile
+  var optimizelyClientInstance = optimizely.createInstance({
+    datafile: datafile,
+    jsonSchemaValidator: jsonSchemaValidator,
+  });
+  ```
+- Dropped support for Node.js version <8 ([#456](https://github.com/optimizely/javascript-sdk/pull/456))
+
+### Bug fixes
+
+- Changed `track()` to log a warning instead of an error when the event isn't in the datafile ([#418](https://github.com/optimizely/javascript-sdk/pull/418))
+- Fixed return type for `close` method in TypeScript type definitions ([#410](https://github.com/optimizely/javascript-sdk/pull/410))
+- Node.js datafile manager uses gzip,deflate compression for requests ([#456](https://github.com/optimizely/javascript-sdk/pull/456))
+
 ## [4.0.0-rc.2] - April 24, 2020
 
 ### Bug fixes

packages/optimizely-sdk/lib/index.browser.tests.js

@@ -145,7 +145,7 @@ describe('javascript-sdk', function() {
         optlyInstance.onReady().catch(function() {});
 
         assert.instanceOf(optlyInstance, Optimizely);
-        assert.equal(optlyInstance.clientVersion, '4.0.0-rc.2');
+        assert.equal(optlyInstance.clientVersion, '4.0.0');
       });
 
       it('should set the JavaScript client engine and version', function() {

packages/optimizely-sdk/lib/index.node.tests.js

@@ -90,7 +90,7 @@ describe('optimizelyFactory', function() {
         optlyInstance.onReady().catch(function() {});
 
         assert.instanceOf(optlyInstance, Optimizely);
-        assert.equal(optlyInstance.clientVersion, '4.0.0-rc.2');
+        assert.equal(optlyInstance.clientVersion, '4.0.0');
       });
 
       describe('event processor configuration', function() {

packages/optimizely-sdk/lib/index.react_native.tests.js

@@ -89,7 +89,7 @@ describe('javascript-sdk/react-native', function() {
         optlyInstance.onReady().catch(function() {});
 
         assert.instanceOf(optlyInstance, Optimizely);
-        assert.equal(optlyInstance.clientVersion, '4.0.0-rc.2');
+        assert.equal(optlyInstance.clientVersion, '4.0.0');
       });
 
       it('should set the Javascript client engine and version', function() {

packages/optimizely-sdk/lib/utils/enums/index.js

@@ -173,7 +173,7 @@ export var CONTROL_ATTRIBUTES = {
 export var JAVASCRIPT_CLIENT_ENGINE = 'javascript-sdk';
 export var NODE_CLIENT_ENGINE = 'node-sdk';
 export var REACT_CLIENT_ENGINE = 'react-sdk';
-export var NODE_CLIENT_VERSION = '4.0.0-rc.2';
+export var NODE_CLIENT_VERSION = '4.0.0';
 
 export var VALID_CLIENT_ENGINES = [
   NODE_CLIENT_ENGINE,

packages/optimizely-sdk/package-lock.json

@@ -1,6 +1,6 @@
 {
   "name": "@optimizely/optimizely-sdk",
-  "version": "4.0.0-rc.2",
+  "version": "4.0.0",
   "description": "JavaScript SDK for Optimizely X Full Stack",
   "module": "dist/optimizely.browser.es.min.js",
   "main": "dist/optimizely.node.min.js",