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@cycle/fetch

v4.0.0

Published

A Cycle.js Driver for making HTTP requests through fetch

Downloads

14

Readme

Cycle Fetch Driver

A Cycle.js Driver for making HTTP requests, using the Fetch API.

Install

npm install @cycle/fetch

API

makeFetchDriver(scheduler: Scheduler) -> fetchDriver: function

Factory that returns a fetch driver. It takes an optional scheduler argument to pass into fromPromise.

Usage

Basics:

import 'whatwg-fetch' // polyfill if you want to support older browsers
import Cycle from '@cycle/core';
import { makeFetchDriver } from 'cycle-fetch-driver';

function main(responses) {
  // ...
}

const drivers = {
  Fetch: makeFetchDriver()
}

Cycle.run(main, drivers);

Simple and normal use case:

function main(responses) {
  const HELLO_URL = 'http://localhost:8080/hello';
  let request$ = Rx.Observable.just(HELLO_URL);
  let vtree$ = responses.Fetch
    .byUrl(HELLO_URL)
    .mergeAll()
    .flatMap(res => res.text()) // We expect this to be "Hello World"
    .startWith('Loading...')
    .map(text =>
      h('div.container', [
        h('h1', text)
      ])
    );

  return {
    DOM: vtree$,
    Fetch: request$
  };
}

Select all the responses for a certain key:

function main(responses) {
  const HELLO_URL = 'http://localhost:8080/hello';
  let request$ = Rx.Observable.just({
    key: 'hello',
    url: HELLO_URL
  });
  let vtree$ = responses.Fetch
    .byKey('hello')
    .mergeAll()
    .flatMap(res => res.text()) // We expect this to be "Hello World"
    .startWith('Loading...')
    .map(text =>
      h('div.container', [
        h('h1', text)
      ])
    );

  return {
    DOM: vtree$,
    Fetch: request$
  };
}