@rails/request.js/src/lib/utils.js

A tiny Fetch API wrapper that allows you to make http requests without need to handle to send the CSRF Token on every request

export function getCookie (name) {
  const cookies = document.cookie ? document.cookie.split('; ') : []
  const prefix = `${encodeURIComponent(name)}=`
  const cookie = cookies.find(cookie => cookie.startsWith(prefix))

  if (cookie) {
    const value = cookie.split('=').slice(1).join('=')

    if (value) {
      return decodeURIComponent(value)
    }
  }
}

export function compact (object) {
  const result = {}

  for (const key in object) {
    const value = object[key]
    if (value !== undefined) {
      result[key] = value
    }
  }

  return result
}

export function metaContent (name) {
  const element = document.head.querySelector(`meta[name="${name}"]`)
  return element && element.content
}

export function stringEntriesFromFormData (formData) {
  return [...formData].reduce((entries, [name, value]) => {
    return entries.concat(typeof value === 'string' ? [[name, value]] : [])
  }, [])
}

export function mergeEntries (searchParams, entries) {
  for (const [name, value] of entries) {
    if (value instanceof window.File) continue

    if (searchParams.has(name) && !name.includes('[]')) {
      searchParams.delete(name)
      searchParams.set(name, value)
    } else {
      searchParams.append(name, value)
    }
  }
}