react-request-hook

Managed, cancelable and safely typed requests.

Table of Contents

• Install
• Quick Start
• Usage
  • useResource
  • useRequest
  • request()
  • createRequestError()
• Type safety for non typescript projects
• Examples
• Acknowledgement
• License

Install

# Yarn yarn add react-request-hook axios # NPM npm install --save react-request-hook axios

Quick Start

import {RequestProvider} from 'react-request-hook'; import axios from 'axios'; // More info about configuration: https://github.com/axios/axios#axioscreateconfig const axiosInstance = axios.create({ baseURL: 'https://example.com/', }); ReactDOM.render( <RequestProvider value={axiosInstance}> <App /> </RequestProvider>, document.getElementById('root'), ); // User Profile component function UserProfile(props) { const [profile, getProfile] = useResource(id => ({ url: `/user/${id}`, method: 'GET' }) useEffect(() => getProfile(props.userId), []) if(profile.isLoading) return <Spinner /> return ( <ProfileScreen avatar={profile.data.avatar} email={profile.data.email} name={profile.data.name} /> ) }

Usage

useResource

The useResource hook manages the request state under the hood. Its high-level API allows one request to be made at a time. Subsequent requests cancel the previous ones, leaving the call to be made with the most recent data available. The API is intended to be similar to useState and useEffect.

It requires a function as the first argument that is just a request config factory and returns a tuple with the resource state and a function to trigger the request call, which accepts the same arguments as the factory one.

const [comments, getComments] = useResource(id => ({ url: `/post/${id}/comments`, method: 'get', }));

The request function returns a canceler that allows you to easily cancel a request on a cleaning phase of a hook.

useEffect(() => { if (props.isDialogOpen) { return getComments(props.postId); } }, [props.isDialogOpen]); interface Resource { isLoading: boolean; // same as `response.data` resolved from the axios promise data: Payload<Request> | null; // Shortcut function to cancel a pending request cancel: (message?: string) => void; // normalized error error: RequestError | null; }

The request can also be triggered passing its arguments as dependencies to the useResource hook.

const [comments] = useResource( (id: string) => ({ url: `/post/${id}/comments`, method: 'get', }), [props.postId], );

It has the same behavior as useEffect. Changing those values triggers another request and cancels the previous one if it's still pending.

If you want more control over the request calls or the ability to call multiple requests from the same resource or not at the same time, you can rely on the useRequest hook.

useRequest

This hook is used internally by useResource. It's responsible for creating the request function and manage the cancel tokens that are being created on each of its calls. This hook also normalizes the error response (if any) and provides a helper that cancel all pending request.

It accepts the same function signature as useResource (a function that returns an object with the Axios request config).

const [request, createRequest] = useRequest((id: string) => ({ url: `/post/${id}/comments`, method: 'get', })); interface CreateRequest { // same args used on the callback provided to the hook (...args): { // cancel the requests created on this factory cancel: (message?: string) => void; ready: () => Promise; }; } interface Request { hasPending: boolean; // clear all pending requests clear: (message?: string) => void; }

By using it, you're responsible for handling the promise resolution. It's still canceling pending requests when unmounting the component.

useEffect(() => { const {ready, cancel} = createRequest(props.postId); ready() .then(setState) .catch(error => { if (error.isCancel === false) { setError(error); } }); return cancel; }, [props.postId]);

request

The request function allows you to define the response type coming from it. It also helps with creating a good pattern on defining your API calls and the expected results. It's just an identity function that accepts the request config and returns it. Both useRequest and useResource extract the expected and annotated type definition and resolve it on the response.data field.

const api = { getUsers: () => { return request<Users>({ url: '/users', method: 'GET', }); }, getUserPosts: (userId: string) => { return request<Posts>({ url: `/users/${userId}/posts`, method: 'GET', }); }, };

createRequestError

The createRequestError normalizes the error response. This function is used internally as well. The isCancel flag is returned, so you don't have to call axios.isCancel later on the promise catch block.

interface RequestError { // same as `response.data`, where response is the object coming from the axios promise data: Payload<Request>; message: Error['message']; // code on the `data` field, `error.code` or `error.response.status` // in the order code: number | string; }

Type safety for non typescript projects

This library is entirely written in typescript, so depending on your editor you might have all the type hints out of the box. However, we also provide a payload field to be attached to the request config object, which allows you to define and use the typings for the payload of a given request. We believe that this motivates a better and clean code as we're dealing with some of the most substantial parts of our app implementation.

const api = { getUsers: () => { return { url: '/users', method: 'GET', payload: [{ id: String(), age: Number(), likesVideoGame: Boolean(), }], }); }, };

And you'll have

Example

You can try out react-request-hook right in your browser with the Codesandbox example.

The example folder contains a /components folder with different use cases, like infinite scrolling components, search input that triggers the API, and so on. It's currently a work in progress.

Acknowledgement

Thanks to @kentcdodds for making this implementation a lot easier to test. create-react-library for the initial setup and Grommet with its great components used in the examples.

License

MIT