apollo-link-dedup

---

title: apollo-link-dedup description: Deduplicate matching requests before making a request

NOTE This link is included by default when using apollo-client so you don't need to add it to your link chain if using apollo-client.

Installation

npm install apollo-link-dedup --save

Usage

import { DedupLink } from "apollo-link-dedup";

const link = new DedupLink();

Options

The Dedup Link does not take any options when creating the link.

Context

The Dedup Link can be overridden by using the context on a per operation basis:

• forceFetch: a true or false (defaults to false) to bypass deduplication per request

import { createHttpLink } from "apollo-link-http";
import ApolloClient from "apollo-client";
import InMemoryCache from "apollo-cache-inmemory";

const client = new ApolloClient({
  link: createHttpLink({ uri: "/graphql" }),
  cache: new InMemoryCache()
});

// a query with apollo-client that will not be deduped
client.query({
  query: MY_QUERY,
  context: {
    forceFetch: true
  }
})

Changelog

apollo-link-dedup 1.0.17

• Fixes an issue caused by the DedupLink shared observable returning cleanup logic that unsubscribes from the real observable, without checking whether only one of the many (shared) subscribers are unsubscribing. This caused problems when using DedupLink in front of HttpLink, as this lead to HttpLink aborting HTTP requests while some callers were still waiting for a response. <br/> @ms in #984

2019-03-05

General

• Remove the docs CI step. <br/> @JoviDeCroock in #938

• Enable tree-shaking in Webpack. <br/> @JoviDeCroock in #967

• Import tslib helpers like __extends and __rest from a shared external package, rather than inlining them. <br/> @benjamn in #959

• Shrink apollo-link and apollo-link-http-common packages using ts-invariant and rollup-plugin-invariant. <br/> @benjamn in #969

• Add .rpt2_cache to all packages/*/.npmignore files. <br/> @benjamn in #972

docs

• Documentation updates. <br/> @tomazy in #933 <br /> @hobochild in #935 <br /> @bkoltai in #925 <br /> @NickTomlin in #923 <br /> @thekogmo in #913 <br /> @thekogmo in #912 <br /> @ciwchris in #652 <br /> @jasonmerino in #759 <br /> @JoviDeCroock in #942 <br /> @goofiw in #899