Nuxt/lib/app/client.js

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import Vue from 'vue'
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import middleware from './middleware'
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import { createApp, NuxtError } from './index'
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import {
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applyAsyncData,
sanitizeComponent,
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getMatchedComponents,
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getMatchedComponentsInstances,
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flatMapComponents,
getContext,
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middlewareSeries,
promisify,
getLocation,
compile
} from './utils'
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const noopData = () => { return {} }
const noopFetch = () => {}
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// Global shared references
let _lastPaths = []
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let _lastComponentsFiles = []
let app
let router
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<% if (store) { %>let store<% } %>
// Try to rehydrate SSR data from window
const NUXT = window.__NUXT__ || {}
NUXT.components = window.__COMPONENTS__ || null
// Create and mount App
createApp()
.then(mountApp)
.catch(err => {
console.error('[nuxt] Error while initializing app', err)
})
function componentOption(component, key, ...args) {
if (!component || !component.options || !component.options[key]) {
return {}
}
const option = component.options[key]
if (typeof option === 'function') {
return option(...args)
}
return option
}
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function mapTransitions(Components, to, from) {
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const componentTransitions = component => {
const transition = componentOption(component, 'transition', to, from)
return (typeof transition === 'string' ? { name: transition } : transition)
}
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return Components.map(Component => {
// Clone original object to prevent overrides
const transitions = Object.assign({}, componentTransitions(Component))
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// Combine transitions & prefer `leave` transitions of 'from' route
if (from && from.matched.length && from.matched[0].components.default) {
const from_transitions = componentTransitions(from.matched[0].components.default)
Object.keys(from_transitions)
.filter(key => from_transitions[key] && key.toLowerCase().indexOf('leave') !== -1)
.forEach(key => { transitions[key] = from_transitions[key] })
}
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return transitions
})
}
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async function loadAsyncComponents (to, from, next) {
// Check if route hash changed
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const fromPath = from.fullPath.split('#')[0]
const toPath = to.fullPath.split('#')[0]
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this._hashChanged = fromPath === toPath
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<% if (loading) { %>
if (!this._hashChanged && this.$loading.start) {
this.$loading.start()
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}
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<% } %>
try {
await Promise.all(flatMapComponents(to, (Component, _, match, key) => {
// If component already resolved
if (typeof Component !== 'function' || Component.options) {
const _Component = sanitizeComponent(Component)
match.components[key] = _Component
return _Component
}
// Resolve component
return Component().then(Component => {
const _Component = sanitizeComponent(Component)
match.components[key] = _Component
return _Component
})
}))
next()
} catch (err) {
if (!err) err = {}
const statusCode = err.statusCode || err.status || (err.response && err.response.status) || 500
this.error({ statusCode, message: err.message })
next(false)
}
}
// Get matched components
function resolveComponents(router) {
const path = getLocation(router.options.base)
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return flatMapComponents(router.match(path), (Component, _, match, key, index) => {
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// If component already resolved
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if (typeof Component !== 'function' || Component.options) {
const _Component = sanitizeComponent(Component)
match.components[key] = _Component
return _Component
}
// Resolve component
return Component().then(Component => {
const _Component = sanitizeComponent(Component)
if (NUXT.serverRendered) {
applyAsyncData(_Component, NUXT.data[index])
if (NUXT.components) {
Component.options.components = Object.assign(_Component.options.components, NUXT.components[index])
}
_Component._Ctor = _Component
}
match.components[key] = _Component
return _Component
})
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})
}
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function callMiddleware (Components, context, layout) {
let midd = <%= serialize(router.middleware, { isJSON: true }) %>
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let unknownMiddleware = false
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// If layout is undefined, only call global middleware
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if (typeof layout !== 'undefined') {
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midd = [] // Exclude global middleware if layout defined (already called before)
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if (layout.middleware) {
midd = midd.concat(layout.middleware)
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}
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Components.forEach(Component => {
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if (Component.options.middleware) {
midd = midd.concat(Component.options.middleware)
}
})
}
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midd = midd.map(name => {
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if (typeof middleware[name] !== 'function') {
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unknownMiddleware = true
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this.error({ statusCode: 500, message: 'Unknown middleware ' + name })
}
return middleware[name]
})
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if (unknownMiddleware) return
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return middlewareSeries(midd, context)
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}
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async function render (to, from, next) {
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if (this._hashChanged) return next()
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// nextCalled is true when redirected
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let nextCalled = false
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const _next = path => {
<% if(loading) { %>if(this.$loading.finish) this.$loading.finish()<% } %>
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if (nextCalled) return
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nextCalled = true
next(path)
}
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// Update context
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const context = getContext({
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to,
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from,
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<% if (store) { %>store,<% } %>
isClient: true,
next: _next.bind(this),
error: this.error.bind(this),
app
})
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this._context = context
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this._dateLastError = this.$options._nuxt.dateErr
this._hadError = !!this.$options._nuxt.err
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// Get route's matched components
const Components = getMatchedComponents(to)
// If no Components matched, generate 404
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if (!Components.length) {
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// Default layout
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await callMiddleware.call(this, Components, context)
if (context._redirected) return
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// Load layout for error page
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const layout = await this.loadLayout(typeof NuxtError.layout === 'function' ? NuxtError.layout(context) : NuxtError.layout)
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await callMiddleware.call(this, Components, context, layout)
if (context._redirected) return
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this.error({ statusCode: 404, message: 'This page could not be found.' })
return next()
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}
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// Update ._data and other properties if hot reloaded
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Components.forEach(Component => {
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if (Component._Ctor && Component._Ctor.options) {
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Component.options.asyncData = Component._Ctor.options.asyncData
Component.options.fetch = Component._Ctor.options.fetch
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}
})
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// Apply transitions
this.setTransitions(mapTransitions(Components, to, from))
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try {
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// Call middleware
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await callMiddleware.call(this, Components, context)
if (context._redirected) return
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// Set layout
let layout = Components[0].options.layout
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if (typeof layout === 'function') {
layout = layout(context)
}
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layout = await this.loadLayout(layout)
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// Call middleware for layout
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await callMiddleware.call(this, Components, context, layout)
if (context._redirected) return
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// Call .validate()
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let isValid = true
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Components.forEach(Component => {
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if (!isValid) return
if (typeof Component.options.validate !== 'function') return
isValid = Component.options.validate({
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params: to.params || {},
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query : to.query || {},
<% if(store) { %>store: context.store <% } %>
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})
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})
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// ...If .validate() returned false
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if (!isValid) {
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this.error({ statusCode: 404, message: 'This page could not be found.' })
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return next()
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}
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// Call asyncData & fetch hooks on components matched by the route.
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await Promise.all(Components.map((Component, i) => {
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// Check if only children route changed
Component._path = compile(to.matched[i].path)(to.params)
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if (!this._hadError && Component._path === _lastPaths[i] && (i + 1) !== Components.length) {
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return Promise.resolve()
}
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let promises = []
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const hasAsyncData = Component.options.asyncData && typeof Component.options.asyncData === 'function'
const hasFetch = !!Component.options.fetch
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<% if(loading) { %>const loadingIncrease = (hasAsyncData && hasFetch) ? 30 : 45<% } %>
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// Call asyncData(context)
if (hasAsyncData) {
const promise = promisify(Component.options.asyncData, context)
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.then(asyncDataResult => {
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applyAsyncData(Component, asyncDataResult)
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<% if(loading) { %>if(this.$loading.increase) this.$loading.increase(loadingIncrease)<% } %>
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})
promises.push(promise)
}
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// Call fetch(context)
if (hasFetch) {
let p = Component.options.fetch(context)
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if (!p || (!(p instanceof Promise) && (typeof p.then !== 'function'))) {
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p = Promise.resolve(p)
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}
p.then(fetchResult => {
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<% if(loading) { %>if(this.$loading.increase) this.$loading.increase(loadingIncrease)<% } %>
})
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promises.push(p)
}
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return Promise.all(promises)
}))
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_lastPaths = Components.map((Component, i) => compile(to.matched[i].path)(to.params))
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<% if(loading) { %>if(this.$loading.finish) this.$loading.finish()<% } %>
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// If not redirected
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if (!nextCalled) next()
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} catch (error) {
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if (!error) error = {}
_lastPaths = []
error.statusCode = error.statusCode || error.status || (error.response && error.response.status) || 500
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// Load error layout
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let layout = NuxtError.layout
if (typeof layout === 'function') {
layout = layout(context)
}
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await this.loadLayout(layout)
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this.error(error)
next(false)
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}
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}
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// Fix components format in matched, it's due to code-splitting of vue-router
function normalizeComponents (to, ___) {
flatMapComponents(to, (Component, _, match, key) => {
if (typeof Component === 'object' && !Component.options) {
// Updated via vue-router resolveAsyncComponents()
Component = Vue.extend(Component)
Component._Ctor = Component
match.components[key] = Component
}
return Component
})
}
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// When navigating on a different route but the same component is used, Vue.js
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// Will not update the instance data, so we have to update $data ourselves
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function fixPrepatch (to, ___) {
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if (this._hashChanged) return
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Vue.nextTick(() => {
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const instances = getMatchedComponentsInstances(to)
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_lastComponentsFiles = instances.map((instance, i) => {
if (!instance) return '';
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if (_lastPaths[i] === instance.constructor._path && typeof instance.constructor.options.data === 'function') {
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const newData = instance.constructor.options.data.call(instance)
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for (let key in newData) {
Vue.set(instance.$data, key, newData[key])
}
}
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return instance.constructor.options.__file
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})
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// Hide error component if no error
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if (this._hadError && this._dateLastError === this.$options._nuxt.dateErr) {
this.error()
}
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// Set layout
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let layout = this.$options._nuxt.err ? NuxtError.layout : to.matched[0].components.default.options.layout
if (typeof layout === 'function') {
layout = layout(this._context)
}
this.setLayout(layout)
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<% if (isDev) { %>
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// Hot reloading
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setTimeout(() => hotReloadAPI(this), 100)
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<% } %>
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})
}
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function nuxtReady (app) {
window._nuxtReadyCbs.forEach((cb) => {
if (typeof cb === 'function') {
cb(app)
}
})
// Special JSDOM
if (typeof window._onNuxtLoaded === 'function') {
window._onNuxtLoaded(app)
}
// Add router hooks
router.afterEach(function (to, from) {
app.$nuxt.$emit('routeChanged', to, from)
})
}
<% if (isDev) { %>
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// Special hot reload with asyncData(context)
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function hotReloadAPI (_app) {
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if (!module.hot) return
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let $components = []
let $nuxt = _app.$nuxt
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while ($nuxt && $nuxt.$children && $nuxt.$children.length) {
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$nuxt.$children.forEach((child, i) => {
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if (child.$vnode.data.nuxtChild) {
let hasAlready = false
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$components.forEach(component => {
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if (component.$options.__file === child.$options.__file) {
hasAlready = true
}
})
if (!hasAlready) {
$components.push(child)
}
}
$nuxt = child
})
}
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$components.forEach(addHotReload.bind(_app))
}
function addHotReload ($component, depth) {
if ($component.$vnode.data._hasHotReload) return
$component.$vnode.data._hasHotReload = true
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var _forceUpdate = $component.$forceUpdate.bind($component.$parent)
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$component.$vnode.context.$forceUpdate = () => {
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let Components = getMatchedComponents(router.currentRoute)
let Component = Components[depth]
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if (!Component) return _forceUpdate()
if (typeof Component === 'object' && !Component.options) {
// Updated via vue-router resolveAsyncComponents()
Component = Vue.extend(Component)
Component._Ctor = Component
}
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this.error()
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let promises = []
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const next = function (path) {
<%= (loading ? 'this.$loading.finish && this.$loading.finish()' : '') %>
router.push(path)
}
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let context = getContext({ route: router.currentRoute<%= (store ? ', store' : '') %>, isClient: true, hotReload: true, next: next.bind(this), error: this.error }, app)
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<%= (loading ? 'this.$loading.start && this.$loading.start()' : '') %>
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callMiddleware.call(this, Components, context)
.then(() => {
// If layout changed
if (depth !== 0) return Promise.resolve()
let layout = Component.options.layout || 'default'
if (typeof layout === 'function') {
layout = layout(context)
}
if (this.layoutName === layout) return Promise.resolve()
let promise = this.loadLayout(layout)
promise.then(() => {
this.setLayout(layout)
Vue.nextTick(() => hotReloadAPI(this))
})
return promise
})
.then(() => {
return callMiddleware.call(this, Components, context, this.layout)
})
.then(() => {
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// Call asyncData(context)
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let pAsyncData = promisify(Component.options.asyncData || noopData, context)
pAsyncData.then((asyncDataResult) => {
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applyAsyncData(Component, asyncDataResult)
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<%= (loading ? 'this.$loading.increase && this.$loading.increase(30)' : '') %>
})
promises.push(pAsyncData)
// Call fetch()
Component.options.fetch = Component.options.fetch || noopFetch
let pFetch = Component.options.fetch(context)
if (!pFetch || (!(pFetch instanceof Promise) && (typeof pFetch.then !== 'function'))) { pFetch = Promise.resolve(pFetch) }
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<%= (loading ? 'pFetch.then(() => this.$loading.increase && this.$loading.increase(30))' : '') %>
promises.push(pFetch)
return Promise.all(promises)
})
.then(() => {
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<%= (loading ? 'this.$loading.finish && this.$loading.finish()' : '') %>
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_forceUpdate()
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setTimeout(() => hotReloadAPI(this), 100)
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})
}
}
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<% } %>
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async function mountApp(__app) {
// Set global variables
app = __app.app
router = __app.router
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<% if (store) { %>store = __app.store <% } %>
// Resolve route components
const Components = await Promise.all(resolveComponents(router))
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// Create Vue instance
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const _app = new Vue(app)
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// Load layout
const layout = NUXT.layout || 'default'
await _app.loadLayout(layout)
_app.setLayout(layout)
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// Mounts Vue app to DOM element
const mountApp = () => {
_app.$mount('#__nuxt')
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// Listen for first Vue update
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Vue.nextTick(() => {
// Call window.onNuxtReady callbacks
nuxtReady(_app)
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<% if (isDev) { %>
// Enable hot reloading
hotReloadAPI(_app)
<% } %>
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})
}
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// Enable transitions
_app.setTransitions = _app.$options._nuxt.setTransitions.bind(_app)
if (Components.length) {
_app.setTransitions(mapTransitions(Components, router.currentRoute))
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_lastPaths = router.currentRoute.matched.map(route => compile(route.path)(router.currentRoute.params))
_lastComponentsFiles = Components.map(Component => Component.options.__file)
}
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// Initialize error handler
_app.error = _app.$options._nuxt.error.bind(_app)
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_app.$loading = {} // To avoid error while _app.$nuxt does not exist
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if (NUXT.error) _app.error(NUXT.error)
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// Add router hooks
router.beforeEach(loadAsyncComponents.bind(_app))
router.beforeEach(render.bind(_app))
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router.afterEach(normalizeComponents)
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router.afterEach(fixPrepatch.bind(_app))
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// If page already is server rendered
if (NUXT.serverRendered) {
mountApp()
return
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}
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render.call(_app, router.currentRoute, router.currentRoute, path => {
if (!path) {
normalizeComponents(router.currentRoute, router.currentRoute)
fixPrepatch.call(_app, router.currentRoute, router.currentRoute)
mountApp()
return
}
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// Push the path and then mount app
let mounted = false
router.afterEach(() => {
if (mounted) return
mounted = true
mountApp()
})
router.push(path)
})
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}