refactor: spa renderer (#4316)

packages/config/src/config/render.js

@@ -2,7 +2,8 @@
 
 export default () => ({
   bundleRenderer: {
-    shouldPrefetch: () => false
+    shouldPrefetch: () => false,
+    shouldPreload: (fileWithoutQuery, asType) => ['script', 'style'].includes(asType)
   },
   resourceHints: true,
   ssr: undefined,

packages/vue-renderer/src/spa-meta.js

@@ -1,3 +1,4 @@
+import { extname } from 'path'
 import Vue from 'vue'
 import VueMeta from 'vue-meta'
 import { createRenderer } from 'vue-server-renderer'
@@ -70,8 +71,8 @@ export default class SPAMetaRenderer {
 
     const clientManifest = this.renderer.context.resources.clientManifest
 
-    const shouldPreload = this.options.render.bundleRenderer.shouldPreload || (() => true)
-    const shouldPrefetch = this.options.render.bundleRenderer.shouldPrefetch || (() => true)
+    const shouldPreload = this.options.render.bundleRenderer.shouldPreload
+    const shouldPrefetch = this.options.render.bundleRenderer.shouldPrefetch
 
     if (this.options.render.resourceHints && clientManifest) {
       const publicPath = clientManifest.publicPath || '/_nuxt/'
@@ -79,18 +80,25 @@ export default class SPAMetaRenderer {
       // Preload initial resources
       if (Array.isArray(clientManifest.initial)) {
         meta.resourceHints += clientManifest.initial
-          .filter(file => shouldPreload(file))
-          .map(
-            r => `<link rel="preload" href="${publicPath}${r}" as="script" />`
-          )
+          .map(SPAMetaRenderer.normalizeFile)
+          .filter(({ fileWithoutQuery, asType }) => shouldPreload(fileWithoutQuery, asType))
+          .map(({ file, extension, fileWithoutQuery, asType }) => {
+            let extra = ''
+            if (asType === 'font') {
+              extra = ` type="font/${extension}" crossorigin`
+            }
+            return `<link rel="preload" href="${publicPath}${file}"${
+              asType !== '' ? ` as="${asType}"` : ''}${extra}>`
+          })
           .join('')
       }
 
       // Prefetch async resources
       if (Array.isArray(clientManifest.async)) {
         meta.resourceHints += clientManifest.async
-          .filter(file => shouldPrefetch(file))
-          .map(r => `<link rel="prefetch" href="${publicPath}${r}" />`)
+          .map(SPAMetaRenderer.normalizeFile)
+          .filter(({ fileWithoutQuery, asType }) => shouldPrefetch(fileWithoutQuery, asType))
+          .map(({ file }) => `<link rel="prefetch" href="${publicPath}${file}">`)
           .join('')
       }
 
@@ -104,16 +112,36 @@ export default class SPAMetaRenderer {
     meta.getPreloadFiles = () =>
       clientManifest.initial
         .filter(file => shouldPreload(file))
-        .map(r => ({
-          file: r,
-          fileWithoutQuery: r,
-          asType: 'script',
-          extension: 'js'
-        }))
+        .map(SPAMetaRenderer.normalizeFile)
 
     // Set meta tags inside cache
     this.cache.set(url, meta)
 
     return meta
   }
+
+  static normalizeFile(file) {
+    const withoutQuery = file.replace(/\?.*/, '')
+    const extension = extname(withoutQuery).slice(1)
+    return {
+      file,
+      extension,
+      fileWithoutQuery: withoutQuery,
+      asType: SPAMetaRenderer.getPreloadType(extension)
+    }
+  }
+
+  static getPreloadType(ext) {
+    if (ext === 'js') {
+      return 'script'
+    } else if (ext === 'css') {
+      return 'style'
+    } else if (/jpe?g|png|svg|gif|webp|ico/.test(ext)) {
+      return 'image'
+    } else if (/woff2?|ttf|otf|eot/.test(ext)) {
+      return 'font'
+    } else {
+      return ''
+    }
+  }
 }

test/fixtures/spa/nuxt.config.js

@@ -4,6 +4,15 @@ export default {
   render: {
     http2: {
       push: true
+    },
+    bundleRenderer: {
+      shouldPrefetch: () => true
+    }
+  },
+  build: {
+    filenames: {
+      app: '[name].js',
+      chunk: '[name].js'
     }
   },
   plugins: [

test/unit/spa.test.js

@@ -1,5 +1,5 @@
 import consola from 'consola'
-import { loadFixture, getPort, Nuxt } from '../utils'
+import { loadFixture, getPort, Nuxt, wChunk } from '../utils'
 
 let nuxt, port
 const url = route => 'http://localhost:' + port + route
@@ -27,6 +27,21 @@ describe('spa', () => {
     consola.log.mockClear()
   })
 
+  test('/ (include preload and prefetch resources)', async () => {
+    const { head } = await renderRoute('/')
+    expect(head).toMatch(`<link rel="preload" href="/_nuxt/runtime.js" as="script">`)
+    expect(head).toMatch(`<link rel="preload" href="/_nuxt/commons.app.js" as="script">`)
+    expect(head).toMatch(`<link rel="preload" href="/_nuxt/app.js" as="script">`)
+    expect(head).toMatch(`<link rel="prefetch" href="/_nuxt/${wChunk('pages/custom.js')}">`)
+    expect(head).toMatch(`<link rel="prefetch" href="/_nuxt/${wChunk('pages/error-handler-async.js')}">`)
+    expect(head).toMatch(`<link rel="prefetch" href="/_nuxt/${wChunk('pages/error-handler-object.js')}">`)
+    expect(head).toMatch(`<link rel="prefetch" href="/_nuxt/${wChunk('pages/error-handler-string.js')}">`)
+    expect(head).toMatch(`<link rel="prefetch" href="/_nuxt/${wChunk('pages/error-handler.js')}">`)
+    expect(head).toMatch(`<link rel="prefetch" href="/_nuxt/${wChunk('pages/index.js')}">`)
+    expect(head).toMatch(`<link rel="prefetch" href="/_nuxt/${wChunk('pages/mounted.js')}">`)
+    consola.log.mockClear()
+  })
+
   test('/custom (custom layout)', async () => {
     const { html } = await renderRoute('/custom')
     expect(html).toMatch('Custom layout')