After discovering the benefits of lazy loading components, I decided to start implementing it in my project. However, I encountered some issues when trying to prefetch the lazy loaded components and vue-router routes. Upon inspecting with Chrome DevTools, I noticed that the lazy loaded chunks are only loaded when we navigate to the specific route or when a v-if statement evaluates to true, rendering the component.
I attempted to utilize the webpackPrefetch: true string in both the router configuration and component import statement, but unfortunately, it did not have any noticeable impact.
Project structure:
Master-Detail layout
router config:
import Vue from "vue";
import Router from "vue-router";
Vue.use(Router);
var routes = [
{
path: "/DetailPage",
component: () => import(/* webpackChunkName: "Detail-chunk" */ "AppModules/views/MyModuleName/DetailPage.vue")
},
{
path: "/MasterPage",
component: () => import("AppModules/views/MyModuleName/MasterPage.vue")
}
]
export const router = new Router({
routes: routes,
stringifyQuery(query) {
// encrypt query string here
}
});
export default router;
Master view:
<template>
<div @click="navigate">
Some text
</div>
</template>
<script>
export default {
name: "MasterPage",
methods: {
navigate() {
this.$router.push({
path: "/DetailPage",
query: {},
});
},
},
};
</script>
Details page:
<template>
<div>
<my-component v-if="showComponent" />
<div @click="showComponent = true">Show Component</div>
</div>
</template>
<script>
const MyComponent = () => import(/* webpackChunkName: "MyComponent-chunk" */ "AppCore/components/AppElements/Helpers/MyComponent");
export default {
name: "DetailPage",
components: {
MyComponent,
},
data() {
return {
showComponent: false
}
}
};
</script>
vue.js.config file:
const path = require("path");
const BundleAnalyzerPlugin = require("webpack-bundle-analyzer")
.BundleAnalyzerPlugin;
module.exports = {
publicPath: "some-url",
outputDir: "./some/path",
chainWebpack: webapckConfig => {
webapckConfig.plugin("html").tap(() => {
return [
{
inject: true,
filename: "index.html",
template: "./public/index.html"
}
];
});
},
productionSourceMap: true,
configureWebpack: {
plugins: [
new BundleAnalyzerPlugin({
analyzerMode: "server",
generateStatsFile: false,
statsOptions: {
excludeModules: "node_modules"
}
})
],
output: {
filename: "some file name",
libraryTarget: "window"
},
module: {
rules: [
{
test: /\.(woff|woff2)(\?v=\d+\.\d+\.\d+)?$/,
use: [
{
loader: "url-loader",
options: {
limit: 50000,
fallback: "file-loader",
outputPath: "/assets/fonts",
name: "[name].[ext]?hash=[hash]"
}
}
]
}
]
},
resolve: {
alias: {
vue$: process.env.NODE_ENV == 'production' ? 'vue/dist/vue.min.js' : 'vue/dist/vue.js',
AppCore: path.resolve(__dirname, "..", "..", "AppCoreLite"),
AppModules: path.resolve(__dirname, "..", "..", "AppModulesLite")
}
}
}
};
Despite splitting async routes and components into separate chunks, these chunks are not prefetched. When navigating to the master view, Detail-chunk.[hash].js is not seen in the network tab until the navigation method is triggered. Similarly, on the details page, MyComponent-chunk.[hash].js is only requested when showComponent becomes true upon clicking a button.
It's worth noting that there are claims stating that vue-cli v3 has prefetch functionality enabled by default and does not require the webpack magic string. Removing the webpackPrefetch comment did not yield any changes in behavior.
When running vue-cli-service inspect, I confirmed that the prefetch plugin is indeed present in the webpack config:
/* config.plugin('preload') */
new PreloadPlugin(
{
rel: 'preload',
include: 'initial',
fileBlacklist: [
/\.map$/,
/hot-update\.js$/
]
}
),
/* config.plugin('prefetch') */
new PreloadPlugin(
{
rel: 'prefetch',
include: 'asyncChunks'
}
),
UPDATE: Despite attempting to remove the prefetch webpack plugin and utilizing the webpack magic comment, no difference was observed.
How can I successfully implement prefetch functionality in my project?