@urql/exchange-execute is an exchange for the urql GraphQL client which executes queries against a local schema. This is a replacement for the default fetchExchange which sends queries over HTTP/S to be executed remotely.

Quick Start Guide

First install @urql/exchange-execute alongside urql:

yarn add @urql/exchange-execute
# or
npm install --save @urql/exchange-execute

You'll then need to add the executeExchange, that this package exposes, to your urql Client, by replacing the default fetch exchange with it:

import { createClient, dedupExchange, cacheExchange } from 'urql';
import { executeExchange } from '@urql/exchange-execute';

const client = createClient({
  url: 'http://localhost:1234/graphql',
  exchanges: [
    dedupExchange,
    cacheExchange,
    // Replace the default fetchExchange with the new one.
    executeExchange({
      /* config */
    }),
  ],
});

Usage

The exchange takes the same arguments as the execute function provided by graphql-js.

Here's a brief example of how it might be used:

import { buildSchema } from 'graphql';

// Create local schema
const schema = buildSchema(`
  type Todo {
    id: ID!
    text: String!
  }

  type Query {
    todos: [Todo]!
  }

  type Mutation {
    addTodo(text: String!): Todo!
  }
`);

// Create local state
let todos = [];

// Create root value with resolvers
const rootValue = {
  todos: () => todos,
  addTodo: (_, args) => {
    const todo = { id: todos.length.toString(), ...args };
    todos = [...todos, todo];
    return todo;
  }
}

// ...

// Pass schema and root value to executeExchange
executeExchange({
  schema,
  rootValue,
}),
// ...