const path = require('path')
const PrerenderSPAPlugin = require('prerender-spa-plugin')

module.exports = {
  plugins: [
    ...
    new PrerenderSPAPlugin({
      // Required - The path to the webpack-outputted app to prerender.
      staticDir: path.join(__dirname, 'dist'),
      // Required - Routes to render.
      routes: [ '/', '/about', '/some/deep/nested/route' ],
    })
  ]
}

const path = require('path')
const PrerenderSPAPlugin = require('prerender-spa-plugin')
const Renderer = PrerenderSPAPlugin.PuppeteerRenderer

module.exports = {
  plugins: [
    ...
    new PrerenderSPAPlugin({
      // Required - The path to the webpack-outputted app to prerender.
      staticDir: path.join(__dirname, 'dist'),

      // Optional - The path your rendered app should be output to.
      // (Defaults to staticDir.)
      outputDir: path.join(__dirname, 'prerendered'),

      // Optional - The location of index.html
      indexPath: path.join(__dirname, 'dist', 'index.html'),

      // Required - Routes to render.
      routes: [ '/', '/about', '/some/deep/nested/route' ],

      // Optional - Allows you to customize the HTML and output path before
      // writing the rendered contents to a file.
      // renderedRoute can be modified and it or an equivelant should be returned.
      // renderedRoute format:
      // {
      //   route: String, // Where the output file will end up (relative to outputDir)
      //   originalRoute: String, // The route that was passed into the renderer, before redirects.
      //   html: String, // The rendered HTML for this route.
      //   outputPath: String // The path the rendered HTML will be written to.
      // }
      postProcess (renderedRoute) {
        // Ignore any redirects.
        renderedRoute.route = renderedRoute.originalRoute
        // Basic whitespace removal. (Don't use this in production.)
        renderedRoute.html = renderedRoute.html.split(/>[\s]+</gmi).join('><')
        // Remove /index.html from the output path if the dir name ends with a .html file extension.
        // For example: /dist/dir/special.html/index.html -> /dist/dir/special.html
        if (renderedRoute.route.endsWith('.html')) {
          renderedRoute.outputPath = path.join(__dirname, 'dist', renderedRoute.route)
        }

        return renderedRoute
      },

      // Optional - Uses html-minifier (https://github.com/kangax/html-minifier)
      // To minify the resulting HTML.
      // Option reference: https://github.com/kangax/html-minifier#options-quick-reference
      minify: {
        collapseBooleanAttributes: true,
        collapseWhitespace: true,
        decodeEntities: true,
        keepClosingSlash: true,
        sortAttributes: true
      },

      // Server configuration options.
      server: {
        // Normally a free port is autodetected, but feel free to set this if needed.
        port: 8001
      },

      // The actual renderer to use. (Feel free to write your own)
      // Available renderers: https://github.com/Tribex/prerenderer/tree/master/renderers
      renderer: new Renderer({
        // Optional - The name of the property to add to the window object with the contents of `inject`.
        injectProperty: '__PRERENDER_INJECTED',
        // Optional - Any values you'd like your app to have access to via `window.injectProperty`.
        inject: {
          foo: 'bar'
        },

        // Optional - defaults to 0, no limit.
        // Routes are rendered asynchronously.
        // Use this to limit the number of routes rendered in parallel.
        maxConcurrentRoutes: 4,

        // Optional - Wait to render until the specified event is dispatched on the document.
        // eg, with `document.dispatchEvent(new Event('custom-render-trigger'))`
        renderAfterDocumentEvent: 'custom-render-trigger',

        // Optional - Wait to render until the specified element is detected using `document.querySelector`
        renderAfterElementExists: 'my-app-element',

        // Optional - Wait to render until a certain amount of time has passed.
        // NOT RECOMMENDED
        renderAfterTime: 5000, // Wait 5 seconds.

        // Other puppeteer options.
        // (See here: https://github.com/GoogleChrome/puppeteer/blob/master/docs/api.md#puppeteerlaunchoptions)
        headless: false // Display the browser window when rendering. Useful for debugging.
      })
    })
  ]
}

const path = require('path')
const PrerenderSPAPlugin = require('prerender-spa-plugin')

module.exports = {

  // ...

  plugins: [
    new PrerenderSPAPlugin(
      // (REQUIRED) Absolute path to static root
      path.join(__dirname, 'relative/path/to/static/root'),
      // (REQUIRED) List of routes to prerender
      [ '/', '/about', '/contact' ],
      // (OPTIONAL) Compatible options from v2.
      {
        // NOTE: Unless you are relying on asynchronously rendered content,
        // such as after an Ajax request, none of these options should be
        // necessary. All synchronous scripts are already executed before
        // capturing the page content.

        // Wait until a specific event is fired on the document.
        captureAfterDocumentEvent: 'custom-post-render-event',
        // This is how you would trigger this example event:
        // document.dispatchEvent(new Event('custom-post-render-event'))

        // Wait until a specific element is detected with
        // document.querySelector.
        captureAfterElementExists: '#content',

        // Wait until a number of milliseconds has passed after scripts
        // have been executed. It's important to note that this may
        // produce unreliable results when relying on network
        // communication or other operations with highly variable timing.
        captureAfterTime: 5000,

        // path of index file. By default it's index.html in static root.
        indexPath: path.resolve('/dist/path/to/index.html'),

        // Manually transform the HTML for each page after prerendering,
        // for example to set the page title and metadata in edge cases
        // where you cannot handle this via your routing solution.
        //
        // The function's context argument contains two properties:
        //
        // - html :: the resulting HTML after prerendering)
        // - route :: the route currently being processed
        //            e.g. "/", "/about", or "/contact")
        //
        // Whatever is returned will be printed to the prerendered file.
        // NOTE: this has been deprecated in favor of the `postProcess` option.
        // See the documentation below.
        postProcessHtml: function (context) {
          var titles = {
            '/': 'Home',
            '/about': 'Our Story',
            '/contact': 'Contact Us'
          }
          return context.html.replace(
            /<title>[^<]*<\/title>/i,
            '<title>' + titles[context.route] + '</title>'
          )
        }
      }
    )
  ]
}

{
  // The prerendered route, after following redirects.
  route: String,
  // The original route passed, before redirects.
  originalRoute: String,
  // The resulting HTML for the route.
  html: String,
  // The path to write the rendered HTML to.
  // This is null (automatically calculated after postProcess)
  // unless explicitly set.
  outputPath: String || null
}

postProcess(context) {
  // Remove /index.html from the output path if the dir name ends with a .html file extension.
  // For example: /dist/dir/special.html/index.html -> /dist/dir/special.html
  if (context.route.endsWith('.html')) {
    context.outputPath = path.join(__dirname, 'dist', context.route)
  }

  return context
}

postProcess(context) {
  return someAsyncProcessing(context.html)
    .then((html) => {
      context.html = html;
      return context;
    });
}

document.addEventListener('DOMContentLoaded', function () {
  // your code
})

const root = new Vue({
  // ...
})

document.addEventListener('DOMContentLoaded', function () {
  root.$mount('#app')
})