@tanstack/db/dist/esm/query/subset-dedupe.js

A reactive client store for building super fast apps on sync

import { getLoadSubsetDemandKey } from "./ir-stable-identity.js";
class DeduplicatedLoadSubset {
  constructor(options) {
    this.options = options;
    this.completed = /* @__PURE__ */ new Set();
    this.inflight = /* @__PURE__ */ new Map();
    this.generation = 0;
    this.loadSubset = (options2) => {
      const key = getLoadSubsetDemandKey(options2);
      if (this.completed.has(key)) {
        this.options.onDeduplicate?.(options2);
        return true;
      }
      const existing = options2.signal ? void 0 : this.inflight.get(key);
      if (existing) {
        void existing.then(() => this.options.onDeduplicate?.(options2)).catch(() => {
        });
        return existing;
      }
      const generation = this.generation;
      const result = this.options.loadSubset(options2);
      if (result === true) {
        if (generation === this.generation && !options2.signal?.aborted) {
          this.completed.add(key);
        }
        return true;
      }
      const promise = result.then((value) => {
        if (generation === this.generation && !options2.signal?.aborted) {
          this.completed.add(key);
        }
        return value;
      }).finally(() => {
        if (this.inflight.get(key) === promise) this.inflight.delete(key);
      });
      if (!options2.signal && generation === this.generation) {
        this.inflight.set(key, promise);
      }
      return promise;
    };
  }
  reset() {
    this.completed.clear();
    this.inflight.clear();
    this.generation++;
  }
}
export {
  DeduplicatedLoadSubset
};
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