@apollo/client

What are @apollo/client's main functionalities?

import { useQuery, gql } from '@apollo/client';

const GET_LAUNCHES = gql`
  query GetLaunches {
    launches {
      id
      mission_name
    }
  }
`;

function Launches() {
  const { loading, error, data } = useQuery(GET_LAUNCHES);

  if (loading) return <p>Loading...</p>;
  if (error) return <p>Error :(</p>;

  return data.launches.map(({ id, mission_name }) => (
    <div key={id}>
      <p>{mission_name}</p>
    </div>
  ));
}

import { useMutation, gql } from '@apollo/client';

const ADD_TODO = gql`
  mutation AddTodo($type: String!) {
    addTodo(type: $type) {
      id
      type
    }
  }
`;

function AddTodo() {
  let input;
  const [addTodo, { data }] = useMutation(ADD_TODO);

  return (
    <div>
      <form
        onSubmit={e => {
          e.preventDefault();
          addTodo({ variables: { type: input.value } });
          input.value = '';
        }}
      >
        <input
          ref={node => {
            input = node;
          }}
        />
        <button type="submit">Add Todo</button>
      </form>
    </div>
  );
}

import { gql, useApolloClient } from '@apollo/client';

const GET_LOCAL_STATE = gql`
  query GetLocalState {
    isLoggedIn @client
  }
`;

function LoginButton() {
  const client = useApolloClient();
  const data = client.readQuery({ query: GET_LOCAL_STATE });
  const isLoggedIn = data.isLoggedIn;

  return (
    <button onClick={() => {
      client.writeQuery({
        query: GET_LOCAL_STATE,
        data: { isLoggedIn: !isLoggedIn }
      });
    }}>
      {isLoggedIn ? 'Log out' : 'Log in'}
    </button>
  );
}

3.10.4

Patch Changes

• #11838 8475346 Thanks @alex-kinokon! - Don’t prompt for DevTools installation for browser extension page

• #11839 6481fe1 Thanks @jerelmiller! - Fix a regression in 3.9.5 where a merge function that returned an incomplete result would not allow the client to refetch in order to fulfill the query.

• #11844 86984f2 Thanks @jerelmiller! - Honor the @nonreactive directive when using cache.watchFragment or the useFragment hook to avoid rerendering when using these directives.

• #11824 47ad806 Thanks @phryneas! - Create branded QueryRef type without exposed properties.

  This change deprecates QueryReference in favor of a QueryRef type that doesn't expose any properties. This change also updates preloadQuery to return a new PreloadedQueryRef type, which exposes the toPromise function as it does today. This means that query refs produced by useBackgroundQuery and useLoadableQuery now return QueryRef types that do not have access to a toPromise function, which was never meant to be used in combination with these hooks.

  While we tend to avoid any types of breaking changes in patch releases as this, this change was necessary to support an upcoming version of the React Server Component integration, which needed to omit the toPromise function that would otherwise have broken at runtime. Note that this is a TypeScript-only change. At runtime, toPromise is still present on all queryRefs currently created by this package - but we strongly want to discourage you from accessing it in all cases except for the PreloadedQueryRef use case.

  Migration is as simple as replacing all references to QueryReference with QueryRef, so it should be possible to do this with a search & replace in most code bases:

  -import { QueryReference } from '@apollo/client'
  +import { QueryRef } from '@apollo/client'
  
  - function Component({ queryRef }: { queryRef: QueryReference<TData> }) {
  + function Component({ queryRef }: { queryRef: QueryRef<TData> }) {
    // ...
  }
  

• #11845 4c5c820 Thanks @jerelmiller! - Remove @nonreactive directives from queries passed to MockLink to ensure they are properly matched.

• #11837 dff15b1 Thanks @jerelmiller! - Fix an issue where a polled query created in React strict mode may not stop polling after the component unmounts while using the cache-and-network fetch policy.