errors.js

export const NavigationFailureType = {
  redirected: 1,
  aborted: 2,
  cancelled: 3,
  duplicated: 4
}

export function createNavigationRedirectedError (from, to) {
  return createRouterError(
    from,
    to,
    NavigationFailureType.redirected,
    `Redirected from "${from.fullPath}" to "${stringifyRoute(to)}" via a navigation guard.`
  )
}

export function createNavigationDuplicatedError (from, to) {
  return createRouterError(
    from,
    to,
    NavigationFailureType.duplicated,
    `Avoided redundant navigation to current location: "${from.fullPath}".`
  )
}

export function createNavigationCancelledError (from, to) {
  return createRouterError(
    from,
    to,
    NavigationFailureType.cancelled,
    `Navigation cancelled from "${from.fullPath}" to "${to.fullPath}" with a new navigation.`
  )
}

export function createNavigationAbortedError (from, to) {
  return createRouterError(
    from,
    to,
    NavigationFailureType.aborted,
    `Navigation aborted from "${from.fullPath}" to "${to.fullPath}" via a navigation guard.`
  )
}

function createRouterError (from, to, type, message) {
  const error = new Error(message)
  error._isRouter = true
  error.from = from
  error.to = to
  error.type = type

  const newStack = error.stack.split('\n')
  newStack.splice(1, 2) // remove 2 last useless calls
  error.stack = newStack.join('\n')
  return error
}

const propertiesToLog = ['params', 'query', 'hash']

function stringifyRoute (to) {
  if (typeof to === 'string') return to
  if ('path' in to) return to.path
  const location = {}
  for (const key of propertiesToLog) {
    if (key in to) location[key] = to[key]
  }
  return JSON.stringify(location, null, 2)
}