@api-platform/mercure

@api-platform/mercure is an EventSource wrapper that discovers a Mercure Hub according to the Link headers and handles subscriptions for you.

import mercure, { close } from "@api-platform/mercure";

const res = await mercure('https://localhost/authors/1', {
    onUpdate: (author) => console.log(author)
})

const author = res.then(res => res.json())

// Close if you need to 
history.onpushstate = function(e) {
    close('https://localhost/authors/1')
}

Assuming /authors/1 returned:

Link: <https://localhost/authors/1>; rel="self"
Link: <https://localhost/.well-known/mercure>; rel="mercure"

A new EventSource is created by subscribing to the topic https://localhost/authors/1 on the Hub https://localhost/.well-known/mercure.

Installation

npm install @api-platform/mercure

Usage

Use mercure like fetch:

import mercure, { close } from "@api-platform/mercure";

const res = await mercure('https://localhost/authors/1', {
    onUpdate: (author) => console.log(author)
})

const author = res.then(res => res.json())

Available options:

• onError on EventSource error callback
• EventSource to provide your own EventSource constructor
• fetchFn to provide your own fetch function, it needs to return a response so that we can read headers

This can be used in conjunction with @api-platform/ld as the fetchFn.

Examples

See our Tanstack query example or the source code of our home page.