io3fix/src/utils/io/check-if-file-exists.js

toolkit for interior apps

import fetch from './fetch.js'
import addCacheBustToQuery from './common/add-cache-bust-to-query.js'

export default function checkIfFileExists (url) {

  if (!url) return Promise.reject('Please provide file URL string as param.')

  return fetch( addCacheBustToQuery(url), {
    method: 'HEAD',
    cache: 'reload'
  }).then(function onSuccess (response) {
    // response.ok provides boolean type information on request status
    // https://developer.mozilla.org/en-US/docs/Web/API/Response/ok
    return response.ok
  }, function onReject () {
    return false
  })
}