Introduce bundle exports (#3742)

* Introduce bundle exports

* Move memo

* Cleanup imports

* Move DoNotConstruct

packages/api-derive/src/util/index.ts

@@ -1,9 +1,8 @@
 // Copyright 2017-2021 @polkadot/api-derive authors & contributors
 // SPDX-License-Identifier: Apache-2.0
 
-export { drr } from '@polkadot/rpc-core/util';
+export { drr, memo } from '@polkadot/rpc-core';
 
 export * from './approvalFlagsToBools';
 export * from './cache';
 export * from './cacheImpl';
-export * from './memo';

packages/api-derive/src/util/memo.ts

@@ -1,33 +0,0 @@
-// Copyright 2017-2021 @polkadot/api-derive authors & contributors
-// SPDX-License-Identifier: Apache-2.0
-
-import type { Observer, TeardownLogic } from 'rxjs';
-import type { Memoized } from '@polkadot/util/types';
-
-import { Observable } from 'rxjs';
-
-import { drr } from '@polkadot/rpc-core/util';
-import { memoize } from '@polkadot/util';
-
-type ObsFn <T> = (...params: any[]) => Observable<T>;
-
-// Wraps a derive, doing 2 things to optimize calls -
-//   1. creates a memo of the inner fn -> Observable, removing when unsubscribed
-//   2. wraps the observable in a drr() (which includes an unsub delay)
-/** @internal */
-export function memo <T> (instanceId: string, inner: ObsFn<T>): Memoized<ObsFn<T>> {
-  const cached = memoize(
-    (...params: any[]): Observable<T> =>
-      new Observable((observer: Observer<T>): TeardownLogic => {
-        const subscription = inner(...params).subscribe(observer);
-
-        return (): void => {
-          cached.unmemoize(...params);
-          subscription.unsubscribe();
-        };
-      }).pipe(drr()),
-    { getInstanceId: () => instanceId }
-  );
-
-  return cached;
-}