[Master] Add readme documentation for IStorageBuffer

README.md

@@ -366,6 +366,7 @@ Most configuration fields are named such that they can be defaulted to falsey. A
 | convertUndefined | `any` | undefined | [Optional] Provide user an option to convert undefined field to user defined value.
 | eventsLimitInMem | number | 10000 | [Optional] The number of events that can be kept in memory before the SDK starts to drop events when not using Session Storage (the default).
 | disableIkeyDeprecationMessage | boolean | true | [Optional]  Disable instrumentation Key deprecation error message. If true, error message will NOT be sent. **Note: instrumentation key support will end soon**, see aka.ms/IkeyMigrate for more details.
+| bufferOverride <br/><sub>since 2.8.12</sub> | IStorageBuffer | undefined | [Optional] Identifies a simple interface to allow you to override the storage mechanism used for tracking unsent and unacknowledged events, when not provided defaults to using SessionStorage interface. You MUST supply both the `getItem` and `setItem` functions when defined.
 
 ### ICookieMgrConfig
 

channels/applicationinsights-channel-js/src/Interfaces.ts

@@ -33,6 +33,7 @@ export interface ISenderConfig {
 
     /**
      * Specify the storage buffer type implementation.
+     * @since 2.8.12
      */
     bufferOverride: () => IStorageBuffer | false;
 

channels/applicationinsights-channel-js/src/Sender.ts

@@ -233,7 +233,7 @@ export class Sender extends BaseTelemetryPlugin implements IChannelControlsAI {
                 });
 
                 const useSessionStorage = _self._senderConfig.enableSessionStorageBuffer() &&
-                    (_self._senderConfig.bufferOverride() || utlCanUseSessionStorage())
+                    !!(_self._senderConfig.bufferOverride() || utlCanUseSessionStorage())
                 _self._buffer = useSessionStorage
                     ? new SessionStorageSendBuffer(diagLog, _self._senderConfig)
                     : new ArraySendBuffer(diagLog, _self._senderConfig);