feat: Export internalServer module for internal LD usage (#804)

Author: keelerm84

packages/shared/sdk-server/src/cache/TtlCache.ts

@@ -4,8 +4,6 @@ function isStale(record: CacheRecord): boolean {
 
 /**
  * Options for the TTL cache.
- *
- * @internal
  */
 export interface TtlCacheOptions {
   /**
@@ -26,8 +24,6 @@ interface CacheRecord {
 
 /**
  * A basic TTL cache with configurable TTL and check interval.
- *
- * @internal
  */
 export default class TtlCache {
   private _storage: Map<string, CacheRecord> = new Map();

packages/shared/sdk-server/src/index.ts

@@ -9,6 +9,7 @@ export * from './store';
 export * from './events';
 
 export * from '@launchdarkly/js-sdk-common';
+export * as internalServer from './internal';
 
 export {
   LDClientImpl,

packages/shared/sdk-server/src/internal/index.ts

@@ -0,0 +1,5 @@
+import TtlCache from '../cache/TtlCache';
+import type { TtlCacheOptions } from '../cache/TtlCache';
+
+export { TtlCache };
+export type { TtlCacheOptions };