Rebrand: polkadot → pezkuwi, substrate → bizinikiwi, kusama → dicle

packages/rpc-core/src/util/drr.ts

@@ -0,0 +1,52 @@
+// Copyright 2017-2025 @pezkuwi/rpc-core authors & contributors
+// SPDX-License-Identifier: Apache-2.0
+
+import type { Observable } from 'rxjs';
+
+import { catchError, distinctUntilChanged, publishReplay, refCount, tap } from 'rxjs';
+
+import { stringify } from '@pezkuwi/util';
+
+import { refCountDelay } from './refCountDelay.js';
+
+export type DrrResult = <T> (source$: Observable<T>) => Observable<T>;
+
+interface Options {
+  delay?: number;
+  skipChange?: boolean;
+  skipTimeout?: boolean;
+}
+
+function CMP (a: unknown, b: unknown): boolean {
+  return stringify({ t: a }) === stringify({ t: b });
+}
+
+function ERR (error: Error): Observable<never> {
+  throw error;
+}
+
+function NOOP (): void {
+  // empty
+}
+
+/**
+ * Shorthand for distinctUntilChanged(), publishReplay(1) and refCount().
+ *
+ * @ignore
+ * @internal
+ */
+export function drr ({ delay, skipChange = false, skipTimeout = false }: Options = {}): DrrResult {
+  return <T> (source$: Observable<T>): Observable<T> =>
+    source$.pipe(
+      catchError(ERR),
+      skipChange
+        ? tap(NOOP)
+        : distinctUntilChanged<T>(CMP),
+      // eslint-disable-next-line deprecation/deprecation
+      publishReplay(1),
+      skipTimeout
+        // eslint-disable-next-line deprecation/deprecation
+        ? refCount()
+        : refCountDelay(delay)
+    );
+}