src/lib/deduplicateStore.ts — radicle-explorer

rad:z4V1sjrXqjvFdnCUbxPFqd5p4DtH5

Radicle web interface

.. router appearance.ts avatar.ts cache.ts commit.ts config.ts deduplicateStore.ts emojis.ts file.ts localStore.ts markdown.ts modal.ts mutexExecutor.ts router.ts sleep.ts syntax.ts utils.ts

import type { Readable, Writable } from "svelte/store";

import { derived } from "svelte/store";
import isEqual from "lodash/isEqual";

// Returns a derived store that only notifies subscribers if the value has changed.
export function deduplicateStore<T>(
  store: Readable<T> | Writable<T>,
): Readable<T> {
  let previous: T;

  return derived(store, ($value, set) => {
    if (!isEqual($value, previous)) {
      previous = $value;
      set($value);
    }
  });
}