Javascript-SDK - 3.1.0
## [3.1.0] - April 22nd, 2019
### New Features:
- Introduced Decision notification listener to be able to record: - Variation assignments for users activated in an experiment. - Feature access for users. - Feature variable value for users.
### Changed
* New APIs for setting `logger` and `logLevel` on the optimizelySDK singleton ([#232](https://github.com/optimizely/javascript-sdk/pull/232)) * `logger` and `logLevel` are now set globally for all instances of Optimizely. If you were passing different loggers to individual instances of Optimizely, logging behavior may now be different.
#### Setting a ConsoleLogger
```js var optimizelySDK = require('@optimizely/optimizely-sdk')
// logger and logLevel are now set on the optimizelySDK singleton optimizelySDK.setLogger(optimizelySDK.logging.createLogger())
// valid levels: 'DEBUG', 'INFO', 'WARN', 'ERROR' optimizelySDK.setLogLevel('WARN') // enums can also be used optimizelySDK.setLogLevel(optimizelySDK.enums.LOG_LEVEL.ERROR) ```
#### Disable logging
```js var optimizelySDK = require('@optimizely/optimizely-sdk')
optimizelySDK.setLogger(null) ```
### Bug Fixes
* Feature variable APIs now return default variable value when featureEnabled property is false. ([#249](https://github.com/optimizely/javascript-sdk/pull/249))
### Deprecated
* Activate notification listener is deprecated as of this release. Recommendation is to use the new Decision notification listener. Activate notification listener will be removed in the next major release.