use-outdated-effect v1.1.1

use-outdated-effect

useEffect with the outdated and unmounted functions as parameters

With useOutdatedEffect, you can check whether the dependency variables changed after async operations, then cancel the proceeding operations as you wish.

install

    npm install --save use-outdated-effect

usage

import React, { FC, useState } from 'react'
import useOutdatedEffect from 'use-outdated-effect'
import axios from 'axios'

const App = (props) => {
  const { id } = props

  const [dataSource, setDataSource] = useState(null)

  useOutdatedEffect(async (outdated, unmounted) => {
    const { data } = await axios.get(`/api/mydata/${id}`)

    if (outdated()) { // check whether dependencies changed. In this example, it's the id variable
      // id changed, stop the current operations
      return
    }

    if (unmounted()) { // check whether component is unmounted
      // component destroied, stop the current operations
      return
    }

    setDataSource(data)
  }, [id])

}