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index.js
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index.js
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const { useState, useEffect } = require('react')
const isDifferent = require('isdifferent')
const fetchHelper = require('@hacknlove/fetchhelper')
/**
* Fetch a url periodically and update the value if changes
* @param {array [url, options]} fethParameters parameter for call the fetch function
* @package {*} first, first value, before real fetch is done
* @param {function} interval, the interval between fetches
*/
function useEndpoint (fethParameters, first, interval = 3000) {
const [value, set] = useState(() => {
setTimeout(refresh, 0)
return [first, undefined]
})
var cancelled = false
async function refresh () {
const response = await fetchHelper(fethParameters)
if (cancelled) {
return
}
if (isDifferent(value, response)) {
return set(response)
}
}
useEffect(() => {
return () => {
cancelled = true
}
}, [])
useEffect(() => {
var i = setInterval(() => {
refresh()
}, interval)
return () => {
clearInterval(i)
}
}, [value])
return [value[0], refresh, value[1]]
}
module.exports = useEndpoint