html-render-webpack-plugin

v3.0.2

Published

2 years ago

webpack plugin for rendering static HTML in a multi-config webpack build

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jahredhope

html static plugin webpack

html-render-webpack-plugin

Plugin to create HTML files with JavaScript.

Supports multiple configurations
Supports code-splitting and dynamic imports

Setup

$ npm install webpack html-render-webpack-plugin
# OR
$ yarn add webpack html-render-webpack-plugin

webpack.config.js

module.exports = {
  ...,
  plugins: [new HtmlRenderPlugin().rendererPlugin]
};

Multiple configurations

If you use multiple webpack configurations you may want to add information from other builds when rendering.

For example, you may wish to add a script tag where the name includes a hash. The asset name comes from the output of one build (browser assets) whilst the render is performed in another build (node rendering).

src/render.js

export default ({ assetsByChunkName }) => {
  return `<html>
<body>
  <script src="${assetsByChunkName.main}"></script>
</body>
</html>`;
};

dist/index.html

<html>
  <body>
    <script src="/main-daf2166db871ad045ea4.js"></script>
  </body>
</html>

See the full example below.

Multiple configuration setup

Add htmlRenderPlugin.statsCollectorPlugin to the plugins of all configurations you want to get stats for.

Add htmlRenderPlugin.rendererPlugin to the plugin of the configuration you want to use to render html.

HtmlRenderPlugin will then pass the Webpack Stats for those builds into your render function.

webpack.config.js

const { HtmlRenderPlugin } = require("html-render-webpack-plugin");

const htmlRenderPlugin = new HtmlRenderPlugin();
module.exports = [
  {
    name: "render",
    target: "node", // Creates assets that render HTML that runs well in node
    plugins: [htmlRenderPlugin.rendererPlugin],
  },
  {
    name: "client",
    target: "web", // Creates files that run on the browser
    plugins: [htmlRenderPlugin.statsCollectorPlugin],
  },
];

See examples for more details.

Options

Option: renderEntry string

default: "main"

The webpack entry to use when rendering. Override when using object syntax.

webpack.config.js

module.exports = {
  entry: {
    myRender: "./src/myRender.js",
  },
  plugins: [
    new HtmlRenderPlugin({
      renderEntry: "myRender",
    }).render,
  ],
};

Option: renderDirectory string

The location to create rendered files. Defaults to the rendered assets output.

Useful when deploying HTML files separate to other build assets.

Option: routes Array<object|string>

default: [""]

Renders a HTML page for each value in the array. A route can be a string showing the folder or file to render, or an object containing a route parameter. index.html is automatically appended for paths.

const routes = ["", "contact", "about"];

A route can be an object, containing a route parameter.

const routes = [
  {
    route: "en-us/contact",
    language: "en-us",
  },
  {
    route: "en-us/about",
    language: "en-us",
  },
  {
    route: "en-au/contact",
    language: "en-au",
  },
  {
    route: "/en-au/about",
    language: "en-au",
  },
];

Option: mapStatsToParams Function

default: ({webpackStats, ...route}) => ({ webpackStats })

mapStatsToParams should accept webpackStats and route information and returns values to be passed into render. The function is called individually for each render.

Recommendation: mapStatsToParams is an opportunity to limit what information is provided to your render function. Keeping the boundary between your build code and application code simple. Avoid passing all webpackStats into your render function, pull out only the information needed. It is recommended to override the default mapStatsToParams behaviour.

Option: transformFilePath Function

default: (route) => route.route ? route.route : route

By default a file will be created using the route value. For example the value {route: '/about/us'} would create about/us/index.html

If you want to use a different file path you can provide a transformFilePath function.

new HtmlRenderPlugin({
  ...
  transformFilePath: ({ route, language }) => `${language}/${route}`
  routes: [
    { route: '/about/us', language: 'en-us' },
    { route: '/about/us', language: 'en-au' }
  ]
});

In this example, the resulting files will be

en-us/about/us/index.html
en-au/about/us/index.html

Option: renderConcurrency string ("serial"|"parallel")

default: "serial"

By default each file will be rendered one after the other, creating a simple sequential build log. When renders with significant asynchronous work you may want to have each render run in parallel.

new HtmlRenderPlugin({
  renderConcurrency: 'parallel'
});

Option: skipAssets Function

default: false

After waiting for all builds to complete HtmlRenderPlugin will render all routes. For particularly large projects with a large number of routes this can take some time. For watch builds you may want to skip emitting assets, relying on createDevRouter instead.

Option: transformExpressPath Function

default: (route) => route.route ? route.route : route

When creating a dev router each route will be attached to the router using it's route value.

If you want to use a different express route you can provide a transformExpressPath function.

Dev Server

Create an Express Middleware to attach to Webpack Dev Server to speed up development builds.

For particularly large projects with slow renders and a large number of routes rendering every route on every build can slow down development. The dev server allows you to only render the pages as they are needed during development, whilst ensuring the resulting render works like the full production render.

Using the Webpack Dev Server Node API create a dev server and attach the dev HtmlRenderPlugin router to it. When pages are requested they will be rendered just-in-time, using the same method of rendering as production.

const htmlRenderPlugin = new HtmlRenderPlugin({
  routes,
  skipAssets: true,
});

const compiler = webpack(config);

const webpackDevServer = new WebpackDevServer(compiler, {
  before: (app) => {
    app.use(htmlRenderPlugin.createDevRouter());
  },
});

webpackDevServer.listen("8081");

Note: Ensure that you use the same htmlRenderPlugin created for your webpack configuration as you use for your dev server.

Manual just-in-time rendering

As an alternative to using the default dev server you can access renderWhenReady to apply your own just-in-time rendering.

Just call renderWhenReady with any route, and the next time the renderer is ready the render will be performed.

Note: Be careful to only use routes that are generated in a production. Not doing this can lead to differences between development and production builds.

Example: Using an Express App to render a dynamic path with ids.

app.get('/books/:id', (req, res) => {
  res.send(await htmlRenderPlugin.renderWhenReady({route: '/books/_id'}))
})

Errors returned during this render will contain a webpackStats attribute when available. This can be useful when rendering your own error pages.

Examples

Example: Client assets

An example of using mapStatsToParams to create <script> tags.

src/render.js

export default ({ mainChunk }) => {
  return `<html>
  <body>
    <script src="${mainChunk}"></script>
  </body>
  </html>`;
};

webpack.config.js

const path = require("path");

const { htmlRenderPlugin, htmlRenderClientPlugin } = createHtmlRenderPlugin({
  mapStatsToParams: ({ webpackStats }) => ({
    mainChunk: webpackStats.toJson().assetsByChunkName.main,
  }),
});

module.exports = [
  {
    name: "client",
    target: "web",
    output: {
      filename: "client-[name]-[contenthash].js",
    },
    entry: path.resolve("src", "client.js"),
    plugins: [htmlRenderPlugin.statsCollectorPlugin],
  },
  {
    name: "render",
    target: "node",
    output: {
      libraryExport: "default",
      libraryTarget: "umd2",
      filename: "render-[name]-[contenthash].js",
    },
    entry: path.resolve("src", "render.js"),
    plugins: [htmlRenderPlugin.rendererPlugin],
  },
];

Migration Guides

Migration from v1 to v2? Checkout the Migration Guide.

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Readme

html-render-webpack-plugin

Setup

Multiple configurations

Multiple configuration setup

Options

Option: renderEntry string

Option: renderDirectory string

Option: routes Array<object|string>

Option: mapStatsToParams Function

Option: transformFilePath Function

Option: renderConcurrency string ("serial"|"parallel")

Option: skipAssets Function

Option: transformExpressPath Function

Dev Server

Manual just-in-time rendering

Examples

Example: Client assets

Migration Guides