Replace memoizee with memoize from @polkadot/util (#2946)

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

@@ -1,11 +1,11 @@
 // Copyright 2017-2020 @polkadot/api-derive authors & contributors
 // SPDX-License-Identifier: Apache-2.0
 
+import type { Memoized } from '@polkadot/util/types';
 import type { Observer, TeardownLogic } from '@polkadot/x-rxjs';
 
-import createMemo from 'memoizee';
-
-import { drr, normalizer } from '@polkadot/rpc-core/util';
+import { drr } from '@polkadot/rpc-core/util';
+import { memoize } from '@polkadot/util';
 import { Observable } from '@polkadot/x-rxjs';
 
 type ObsFn <T> = (...params: any[]) => Observable<T>;
@@ -14,21 +14,18 @@ type ObsFn <T> = (...params: any[]) => Observable<T>;
 //   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>): ObsFn<T> {
-  const cached = createMemo(
+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.delete(...params);
+          cached.unmemoize(...params);
           subscription.unsubscribe();
         };
       }).pipe(drr()),
-    {
-      // Normalize via JSON.stringify, allow e.g. AccountId -> ss58
-      normalizer: normalizer(instanceId)
-    }
+    { getInstanceId: () => instanceId }
   );
 
   return cached;