vuejs · posva · May 19, 2020 · Dec 8, 2019 · Dec 8, 2019 · May 18, 2020
diff --git a/examples/index.html b/examples/index.html
@@ -18,6 +18,7 @@ <h1>Vue Router Examples</h1>
     <li><a href="route-props">Route Props</a></li>
     <li><a href="route-alias">Route Alias</a></li>
     <li><a href="route-params">Route Params</a></li>
+    <li><a href="router-errors">Router errors</a></li>
     <li><a href="transitions">Transitions</a></li>
     <li><a href="data-fetching">Data Fetching</a></li>
     <li><a href="navigation-guards">Navigation Guards</a></li>

diff --git a/examples/router-errors/app.js b/examples/router-errors/app.js
@@ -0,0 +1,53 @@
+import Vue from 'vue'
+import VueRouter from 'vue-router'
+
+const component = {
+  template: `
+  <div>
+  {{ $route.fullPath }}
+  </div>
+  `
+}
+
+Vue.use(VueRouter)
+
+const router = new VueRouter({
+  routes: [
+    { path: '/', component }, { path: '/foo', component }
+  ]
+})
+
+router.beforeEach((to, from, next) => {
+  console.log('from', from.fullPath)
+  console.log('going to', to.fullPath)
+  if (to.query.wait) {
+    setTimeout(() => next(), 100)
+  } else if (to.query.redirect) {
+    next(to.query.redirect)
+  } else if (to.query.abort) {
+    next(false)
+  } else {
+    next()
+  }
+})
+
+new Vue({
+  el: '#app',
+  router
+})
+
+// 4 NAVIGATION ERROR CASES :
+
+// navigation duplicated
+// router.push('/foo')
+// router.push('/foo')
+
+// navigation cancelled
+// router.push('/foo?wait=y')
+// router.push('/')
+
+// navigation redirected
+// router.push('/foo?redirect=/')
+
+// navigation aborted
+// router.push('/foo?abort=y')
diff --git a/examples/router-errors/index.html b/examples/router-errors/index.html
@@ -0,0 +1,8 @@
+<!DOCTYPE html>
+<div id="app">
+  <router-link to="/">/</router-link>
+  <router-link to="/foo">/foo</router-link>
+  <router-view></router-view>
+</div>
+<script src="/__build__/shared.chunk.js"></script>
+<script src="/__build__/router-errors.js"></script>
diff --git a/src/history/abstract.js b/src/history/abstract.js
@@ -2,8 +2,8 @@
 
 import type Router from '../index'
 import { History } from './base'
-import { NavigationDuplicated } from './errors'
-import { isExtendedError } from '../util/warn'
+import { isRouterError } from '../util/warn'
+import { NavigationFailureType } from './errors'
 
 export class AbstractHistory extends History {
   index: number
@@ -51,7 +51,7 @@ export class AbstractHistory extends History {
         this.updateRoute(route)
       },
       err => {
-        if (isExtendedError(NavigationDuplicated, err)) {
+        if (isRouterError(err, NavigationFailureType.NAVIGATION_DUPLICATED)) {
           this.index = targetIndex
         }
       }

diff --git a/src/history/base.js b/src/history/base.js
@@ -4,14 +4,20 @@ import { _Vue } from '../install'
 import type Router from '../index'
 import { inBrowser } from '../util/dom'
 import { runQueue } from '../util/async'
-import { warn, isError, isExtendedError } from '../util/warn'
+import { warn, isError, isRouterError } from '../util/warn'
 import { START, isSameRoute } from '../util/route'
 import {
   flatten,
   flatMapComponents,
   resolveAsyncComponents
 } from '../util/resolve-components'
-import { NavigationDuplicated } from './errors'
+import {
+  createNavigationDuplicatedError,
+  createNavigationCancelledError,
+  createNavigationRedirectedError,
+  createNavigationAbortedError,
+  NavigationFailureType
+} from './errors'
 
 export class History {
   router: Router
@@ -104,7 +110,7 @@ export class History {
       // When the user navigates through history through back/forward buttons
       // we do not want to throw the error. We only throw it if directly calling
       // push/replace. That's why it's not included in isError
-      if (!isExtendedError(NavigationDuplicated, err) && isError(err)) {
+      if (!isRouterError(err, NavigationFailureType.NAVIGATION_DUPLICATED) && isError(err)) {
         if (this.errorCbs.length) {
           this.errorCbs.forEach(cb => {
             cb(err)
@@ -122,7 +128,7 @@ export class History {
       route.matched.length === current.matched.length
     ) {
       this.ensureURL()
-      return abort(new NavigationDuplicated(route))
+      return abort(createNavigationDuplicatedError(current, route))
     }
 
     const { updated, deactivated, activated } = resolveQueue(
@@ -146,12 +152,15 @@ export class History {
     this.pending = route
     const iterator = (hook: NavigationGuard, next) => {
       if (this.pending !== route) {
-        return abort()
+        return abort(createNavigationCancelledError(current, route))
       }
       try {
         hook(route, current, (to: any) => {
-          if (to === false || isError(to)) {
+          if (to === false) {
             // next(false) -> abort navigation, ensure current URL
+            this.ensureURL(true)
+            abort(createNavigationAbortedError(current, route))
+          } else if (isError(to)) {
             this.ensureURL(true)
             abort(to)
           } else if (
@@ -160,7 +169,7 @@ export class History {
               (typeof to.path === 'string' || typeof to.name === 'string'))
           ) {
             // next('/') or next({ path: '/' }) -> redirect
-            abort()
+            abort(createNavigationRedirectedError(current, route))
             if (typeof to === 'object' && to.replace) {
               this.replace(to)
             } else {

diff --git a/src/history/errors.js b/src/history/errors.js
@@ -1,22 +1,67 @@
-export class NavigationDuplicated extends Error {
-  constructor (normalizedLocation) {
-    super()
-    this.name = this._name = 'NavigationDuplicated'
-    // passing the message to super() doesn't seem to work in the transpiled version
-    this.message = `Navigating to current location ("${
-      normalizedLocation.fullPath
-    }") is not allowed`
-    // add a stack property so services like Sentry can correctly display it
-    Object.defineProperty(this, 'stack', {
-      value: new Error().stack,
-      writable: true,
-      configurable: true
-    })
-    // we could also have used
-    // Error.captureStackTrace(this, this.constructor)
-    // but it only exists on node and chrome
-  }
+export const NavigationFailureType = {
+  redirected: 1,
+  aborted: 2,
+  cancelled: 3,
+  duplicated: 4
+}
+
+export function createNavigationRedirectedError (from, to) {
+  return createRouterError(
+    from,
+    to,
+    NavigationFailureType.redirected,
+    `Redirected from "${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.`
+  )
 }
 
-// support IE9
-NavigationDuplicated._name = 'NavigationDuplicated'
+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)
+}
diff --git a/src/util/warn.js b/src/util/warn.js
@@ -16,10 +16,6 @@ export function isError (err: any): boolean {
   return Object.prototype.toString.call(err).indexOf('Error') > -1
 }
 
-export function isExtendedError (constructor: Function, err: any): boolean {
-  return (
-    err instanceof constructor ||
-    // _name is to support IE9 too
-    (err && (err.name === constructor.name || err._name === constructor._name))
-  )
+export function isRouterError (err: any, errorType: ?string): boolean {
+  return isError(err) && err._isRouter && (errorType == null || err.type === errorType)
 }
diff --git a/test/unit/specs/error-handling.spec.js b/test/unit/specs/error-handling.spec.js
@@ -1,5 +1,6 @@
 import Vue from 'vue'
 import VueRouter from '../../../src/index'
+import { NavigationFailureType } from '../../../src/history/errors'
 
 Vue.use(VueRouter)
 
@@ -40,6 +41,56 @@ describe('error handling', () => {
     })
   })
 
+  it('NavigationDuplicated error', done => {
+    const router = new VueRouter()
+
+    router.push('/foo')
+    router.push('/foo').catch(err => {
+      expect(err.type).toBe(NavigationFailureType.duplicated)
+      done()
+    })
+  })
+
+  it('NavigationCancelled error', done => {
+    const router = new VueRouter()
+
+    router.beforeEach((to, from, next) => {
+      setTimeout(() => next(), 100)
+    })
+
+    router.push('/foo').catch(err => {
+      expect(err.type).toBe(NavigationFailureType.cancelled)
+      done()
+    })
+    router.push('/')
+  })
+
+  it('NavigationRedirected error', done => {
+    const router = new VueRouter()
+
+    router.beforeEach((to, from, next) => {
+      if (to.query.redirect) {
+        next(to.query.redirect)
+      }
+    })
+
+    router.push('/foo?redirect=/').catch(err => {
+      expect(err.type).toBe(NavigationFailureType.redirected)
+      done()
+    })
+  })
+
+  it('NavigationAborted error', done => {
+    const router = new VueRouter()
+
+    router.beforeEach((to, from, next) => { next(false) })
+
+    router.push('/foo').catch(err => {
+      expect(err.type).toBe(NavigationFailureType.aborted)
+      done()
+    })
+  })
+
   it('async component errors', done => {
     spyOn(console, 'warn')
     const err = new Error('foo')