HtmlRspackPlugin

Rspack only

rspack.HtmlRspackPlugin generates HTML files for Rspack builds and injects the JavaScript and CSS files required by their entry points. It can also set the document title, add a favicon, and generate <base> and <meta> tags.

Examples: Explore common use cases.
Options: Review types, defaults, and examples.
Template syntax: See supported interpolation and control statements.
Hooks: Modify asset URLs, tags, and HTML.

For help choosing between the built-in plugin and the JavaScript html-rspack-plugin, see the HTML guide.

Examples

Default output

By default, the plugin emits index.html with the assets required by every entry point.

rspack.config.mjs

import { rspack } from '@rspack/core';

export default {
  entry: './src/index.js',
  plugins: [new rspack.HtmlRspackPlugin()],
};

With the built-in template, the generated dist/index.html is equivalent to:

<!doctype html>
<html>
  <head>
    <meta charset="utf-8" />
    <title>rspack</title>
    <script defer src="main.js"></script>
  </head>
  <body></body>
</html>

By default, the plugin injects scripts with defer into <head>. If an entry also produces CSS, the corresponding <link> tags are inserted into <head>. With multiple entry points, the HTML includes assets from all of them.

Generate multiple HTML files

To generate a separate HTML file for each entry point, register multiple rspack.HtmlRspackPlugin instances:

Use filename to name each HTML file.
Use chunks to select the entry-point assets included in each HTML file.

The following configuration emits foo.html and bar.html. Each file contains the assets required by its matching entry point, including runtime and shared assets.

rspack.config.mjs

export default {
  entry: {
    foo: './foo.js',
    bar: './bar.js',
  },
  plugins: [
    new rspack.HtmlRspackPlugin({
      filename: 'foo.html',
      chunks: ['foo'],
    }),
    new rspack.HtmlRspackPlugin({
      filename: 'bar.html',
      chunks: ['bar'],
    }),
  ],
};

Module scripts

When output.module is enabled and scriptLoading is not set, the plugin emits <script type="module"> instead of <script defer>:

rspack.config.mjs

export default {
  output: {
    module: true,
  },
  plugins: [new rspack.HtmlRspackPlugin()],
};

<script src="main.js" type="module"></script>

Production minification

In production mode (mode: 'production'), the plugin minifies the generated HTML when minify is not set. In other modes, HTML is minified only when minify is enabled explicitly.

rspack.config.mjs

export default {
  mode: 'production',
  plugins: [new rspack.HtmlRspackPlugin()],
};

Use a template file

If src/index.ejs exists in the Rspack context, the plugin uses it as the template automatically. Otherwise, it uses the built-in template.

To customize the HTML structure, you can also use template to specify an HTML file. The plugin injects the required JavaScript, CSS, and favicon tags into it.

index.html

<!doctype html>
<html>
  <head>
    <meta charset="utf-8" />
    <title><%= htmlRspackPlugin.options.title %></title>
  </head>
  <body></body>
</html>

rspack.config.mjs

export default {
  plugins: [
    new rspack.HtmlRspackPlugin({
      title: 'My HTML Template',
      template: 'index.html',
    }),
  ],
};

Use template string

You can also provide the HTML template directly through templateContent:

rspack.config.mjs

export default {
  plugins: [
    new rspack.HtmlRspackPlugin({
      title: 'My HTML Template',
      templateContent: `
        <!DOCTYPE html>
        <html>
          <head>
            <title><%= htmlRspackPlugin.options.title %></title>
          </head>
          <body></body>
        </html>
      `,
    }),
  ],
};

Use template function

For dynamically generated template content, use a function in either of these forms:

Pass the function directly to templateContent:

rspack.config.mjs

export default {
  plugins: [
    new rspack.HtmlRspackPlugin({
      title: 'My HTML Template',
      templateContent: ({ htmlRspackPlugin }) => `
        <!DOCTYPE html>
        <html>
          <head>
            <title>${htmlRspackPlugin.options.title}</title>
          </head>
          <body></body>
        </html>
      `,
    }),
  ],
};

Specify a .js or .cjs file in template:

template.js

module.exports = ({ htmlRspackPlugin }) => `
  <!DOCTYPE html>
  <html>
    <head>
      <title>${htmlRspackPlugin.options.title}</title>
    </head>
    <body></body>
  </html>
`;

rspack.config.mjs

export default {
  plugins: [
    new rspack.HtmlRspackPlugin({
      title: 'My HTML Template',
      template: 'template.js',
    }),
  ],
};

Template parameters

Use templateParameters to customize the values passed when rendering an HTML template. Templates receive the following serializable parameters by default:

htmlRspackPlugin: Data exposed by the plugin
- htmlRspackPlugin.options: Normalized plugin options
- htmlRspackPlugin.tags: Generated tags prepared for insertion
  - htmlRspackPlugin.tags.headTags: List of <base>, <meta>, <title>, <link>, and <script> tags for injection in <head>
  - htmlRspackPlugin.tags.bodyTags: List of <script> tags for injection in <body>
- htmlRspackPlugin.files: Asset URLs selected for the current HTML file
  - htmlRspackPlugin.files.js: Selected JavaScript asset URLs
  - htmlRspackPlugin.files.css: Selected CSS asset URLs
  - htmlRspackPlugin.files.favicon: Generated favicon URL when favicon is configured
  - htmlRspackPlugin.files.publicPath: Effective public path used for asset URLs
rspackConfig: Selected Rspack settings
- rspackConfig.mode: Current build mode
- rspackConfig.output.publicPath: Effective public path for the current HTML file, including a publicPath override
- rspackConfig.output.crossOriginLoading: Configured cross-origin loading value

When a JavaScript function renders the template, it can also access the Rspack compilation object. That object is not passed when templateParameters is false or a function.

In a built-in template, use EJS-style interpolation to read these parameters:

rspack.config.mjs

export default {
  mode: 'development',
  plugins: [
    new rspack.HtmlRspackPlugin({
      title: 'My application',
      templateContent: `
        <!doctype html>
        <html>
          <head></head>
          <body>
            <h1><%- htmlRspackPlugin.options.title %></h1>
            <p>Mode: <%- rspackConfig.mode %></p>
          </body>
        </html>
      `,
    }),
  ],
};

In a JavaScript template function, the parameters are passed as an ordinary JavaScript object:

rspack.config.mjs

export default {
  plugins: [
    new rspack.HtmlRspackPlugin({
      templateContent: ({ htmlRspackPlugin }) => `
        <!doctype html>
        <html>
          <head></head>
          <body>
            <p>Scripts: ${htmlRspackPlugin.files.js.join(', ')}</p>
          </body>
        </html>
      `,
    }),
  ],
};

In templates rendered by the built-in engine, call toHtml() to convert a tag or tag list to HTML. In JavaScript template functions, tags and tag lists provide toString() and can be interpolated directly.

Warning

If the template inserts htmlRspackPlugin.tags manually, set inject to false; otherwise, the plugin inserts those tags twice.

Differences

Compared with HtmlWebpackPlugin:

Template paths do not support loader syntax such as loader!./template.html
The compilation object is only available when using a template function, with the templateParameters restrictions described above

Options

Pass the following options to new rspack.HtmlRspackPlugin(). All examples reuse the rspack import from the first example.

title

Type: string
Default: undefined

Sets the <title> of the generated HTML. When automatic injection is enabled, the plugin replaces an existing <title> in the template or adds one to <head>.

When omitted, a custom template keeps its own title. The built-in template uses rspack. Setting inject to false prevents title from being applied automatically, but the value remains available as htmlRspackPlugin.options.title.

new rspack.HtmlRspackPlugin({
  title: 'My application',
});

Generated HTML fragment:

<title>My application</title>

filename

Type:

type HtmlFilenameFunction = (entry: string) => string;
type HtmlFilename = string | HtmlFilenameFunction;

Default: 'index.html'

Sets the HTML asset path and filename relative to output.path. When omitted, the plugin emits index.html in the output directory.

String: Emits the HTML at the specified path. The value can include a subdirectory and filename placeholders such as [name] and [contenthash]. A [name] placeholder emits one HTML file for each statically configured entry.
```
new rspack.HtmlRspackPlugin({
  filename: 'pages/index.html',
});
```

Function: Calls the function once for each statically configured entry, passing its name as the argument. The return value becomes the corresponding HTML filename.

export default {
  entry: {
    app: './src/app.js',
    admin: './src/admin.js',
  },
  plugins: [
    new rspack.HtmlRspackPlugin({
      filename: (entry) => `pages/${entry}.html`,
    }),
  ],
};

The [name] and function forms do not support a function-valued Rspack entry. They only control HTML filenames; every generated file still receives the same entry assets selected by chunks and excludeChunks. Register separate plugin instances when each page needs a different asset set.

template

Type: string
Default: undefined

Sets the template file. Relative paths are resolved from the Rspack context. templateContent takes precedence when both options are set.

When omitted, the plugin looks for src/index.ejs in context and falls back to its built-in HTML document if the file does not exist.

HTML file: Reads the file as text, renders it with the built-in template syntax, and injects the generated tags.

index.html

<!doctype html>
<html>
  <head>
    <title><%= htmlRspackPlugin.options.title %></title>
  </head>
  <body></body>
</html>

new rspack.HtmlRspackPlugin({
  title: 'My application',
  template: './index.html',
});

JavaScript module: A path ending in .js or .cjs is loaded as a CommonJS module. Its exported function receives the template parameters and returns the HTML string, either directly or through a promise.

template.cjs

module.exports = ({ htmlRspackPlugin }) => `
  <!doctype html>
  <html>
    <head><title>${htmlRspackPlugin.options.title}</title></head>
    <body></body>
  </html>
`;

new rspack.HtmlRspackPlugin({
  title: 'My application',
  template: './template.cjs',
});

templateContent

Type:

type TemplateRenderFunction = (
  params: Record<string, any>,
) => string | Promise<string>;

type TemplateContent = string | TemplateRenderFunction;

Default: undefined

Provides the template directly without reading a file. When set, it takes precedence over template and the default template lookup.

String: Renders the string with the built-in template syntax, then injects the generated tags.

new rspack.HtmlRspackPlugin({
  templateContent: `
    <!doctype html>
    <html>
      <head><title>My application</title></head>
      <body></body>
    </html>
  `,
});

Function: Calls the function with the final template parameters. The returned string becomes the HTML template result and is not processed as EJS. The function can be asynchronous.

new rspack.HtmlRspackPlugin({
  title: 'My application',
  templateContent: ({ htmlRspackPlugin }) => `
    <!doctype html>
    <html>
      <head><title>${htmlRspackPlugin.options.title}</title></head>
      <body></body>
    </html>
  `,
});

When omitted, the plugin first uses template if it is set. Otherwise, it looks for src/index.ejs and then falls back to the built-in document.

templateParameters

Type:

type TemplateParamFunction = (
  params: Record<string, any>,
) => Record<string, any> | Promise<Record<string, any>>;

type TemplateParameters =
  Record<string, string> | boolean | TemplateParamFunction;

Default: undefined

Controls the parameters passed to an HTML template or template function. The built-in values are described in Template parameters.

Object: Merges the object's string properties into the built-in parameters. Properties with the same name replace the built-in value.

new rspack.HtmlRspackPlugin({
  templateContent: '<main><%= environment %></main>',
  templateParameters: {
    environment: 'production',
  },
});

Boolean: true preserves the built-in parameters and is equivalent to omitting the option. false passes an empty object to the template.
```
new rspack.HtmlRspackPlugin({
  templateContent: () => '<main>Static page</main>',
  templateParameters: false,
});
```
Function: Calls the function with the serializable built-in parameters and uses its returned object as the complete final parameter object. Return the original properties when the template still needs them. The function can be asynchronous.
```
new rspack.HtmlRspackPlugin({
  templateContent: ({ buildName }) => `<main>${buildName}</main>`,
  templateParameters: (params) => ({
    ...params,
    buildName: 'documentation',
  }),
});
```

The compilation parameter is available only to a JavaScript template function when templateParameters is omitted, true, or an object. It is not passed to string templates, a templateParameters function, or a template function when templateParameters is false.

inject

Type: boolean | 'head' | 'body'
Default: true

Controls automatic insertion of the tags generated by the plugin. When injection is enabled, stylesheets, the title, <base>, <meta>, and favicon tags are inserted into <head>. The 'head' and 'body' values change only the placement of <script> tags.

true: Inserts scripts into <body> when scriptLoading is 'blocking'; otherwise, inserts them into <head>. This is also the behavior when inject is omitted.
```
new rspack.HtmlRspackPlugin({
  inject: true,
});
```
'head' or 'body': Inserts scripts into the selected element, regardless of scriptLoading. Stylesheet and metadata tags remain in <head>.
```
new rspack.HtmlRspackPlugin({
  inject: 'body',
});
```
false: Disables automatic insertion of all generated tags, including scripts, stylesheets, title, <base>, <meta>, and favicon tags. Tags already present in the template are not removed.
```
new rspack.HtmlRspackPlugin({
  inject: false,
});
```

With false, the generated tags remain available through htmlRspackPlugin.tags. A template rendered by the built-in engine can insert them with toHtml(); a JavaScript template function can interpolate them directly. A configured favicon is still emitted as an asset.

publicPath

Type: string
Default: undefined

Sets the URL prefix for JavaScript, CSS, and favicon URLs in the generated HTML. The plugin adds a trailing slash when needed. This option takes precedence over output.publicPath.

When omitted, the plugin uses output.publicPath. An auto output public path is resolved relative to each HTML filename, so an HTML file in a subdirectory can reference assets with paths such as ../main.js.

new rspack.HtmlRspackPlugin({
  publicPath: '/assets/',
});

base

Type:

type HtmlBase =
  | string
  | {
      href?: string;
      target?: '_self' | '_blank' | '_parent' | '_top';
    };

Default: undefined

Creates a <base> tag in <head>. When omitted, no base tag is generated. inject: false prevents the tag from being inserted automatically.

String: Uses the string as the href attribute.

new rspack.HtmlRspackPlugin({
  base: 'https://example.com/app/',
});

Generated HTML fragment:

<base href="https://example.com/app/" />

Object: Sets the optional href and target attributes. An object with neither attribute produces no tag.

new rspack.HtmlRspackPlugin({
  base: {
    href: 'https://example.com/app/',
    target: '_blank',
  },
});

Generated HTML fragment:

<base href="https://example.com/app/" target="_blank" />

scriptLoading

Type: 'blocking' | 'defer' | 'module' | 'systemjs-module'
Default: 'module' when output.module is enabled, otherwise 'defer'

Sets the attributes on generated <script> tags and determines their default injection position. An explicit inject: 'head' or inject: 'body' overrides that position. This option does not change the format of the emitted JavaScript.

'blocking': Adds no loading attribute. With the default inject, scripts are inserted into <body>.
```
new rspack.HtmlRspackPlugin({
  scriptLoading: 'blocking',
});
```
Generated HTML fragment:
```
<script src="main.js"></script>
```
'defer': Adds the boolean defer attribute. With the default inject, scripts are inserted into <head>.
```
new rspack.HtmlRspackPlugin({
  scriptLoading: 'defer',
});
```
Generated HTML fragment:
```
<script defer src="main.js"></script>
```
'module': Adds type="module". Module scripts are deferred by browsers, and the default inject inserts them into <head>.
```
new rspack.HtmlRspackPlugin({
  scriptLoading: 'module',
});
```
Generated HTML fragment:
```
<script src="main.js" type="module"></script>
```

'systemjs-module': Adds type="systemjs-module". The default inject inserts these scripts into <head>.

new rspack.HtmlRspackPlugin({
  scriptLoading: 'systemjs-module',
});

Generated HTML fragment:

<script src="main.js" type="systemjs-module"></script>

chunks

Type: string[]
Default: undefined

Selects entry points whose JavaScript and CSS files are included in the HTML. Each value is compared with an entry point name using exact string equality; it does not match an arbitrary chunk ID, asset filename, or module path. Unknown names are ignored.

When omitted, every entry point is selected before excludeChunks is applied. Selecting an entry point also includes the runtime and shared files required by that entry.

With the default chunksSortMode: 'auto', chunks first limits the entry points and excludeChunks then removes matches. With 'manual', a provided chunks array instead becomes the final ordered entry list. If chunks is omitted, excludeChunks still filters the compilation's entry point order.

export default {
  entry: {
    app: './src/app.js',
    admin: './src/admin.js',
  },
  plugins: [
    new rspack.HtmlRspackPlugin({
      chunks: ['app'],
    }),
  ],
};

excludeChunks

Type: string[]
Default: undefined

Excludes entry points from the generated HTML. Each value is compared with an entry point name using exact string equality; it does not match asset filenames, module paths, or non-entry chunks. Unknown names have no effect.

In the default chunksSortMode: 'auto', exclusions are applied after chunks, so an entry present in both arrays is excluded. With 'manual', a provided chunks array is the final ordered list and excludeChunks is not applied; when chunks is omitted, exclusions still apply to the compilation's entry point order. If excludeChunks is omitted, no selected entry point is excluded.

export default {
  entry: {
    app: './src/app.js',
    admin: './src/admin.js',
  },
  plugins: [
    new rspack.HtmlRspackPlugin({
      excludeChunks: ['admin'],
    }),
  ],
};

chunksSortMode

Type: 'auto' | 'manual'
Default: 'auto'

Controls the order in which selected entry points contribute their files to the generated tags.

'auto': Uses the compilation's entry point order after applying chunks and excludeChunks.
```
new rspack.HtmlRspackPlugin({
  chunksSortMode: 'auto',
});
```
'manual': Uses the order of chunks, ignoring unknown entry names. When chunks is omitted, it uses the compilation's entry point order after applying excludeChunks. When chunks is present, excludeChunks is not applied.
```
new rspack.HtmlRspackPlugin({
  chunks: ['admin', 'app'],
  chunksSortMode: 'manual',
});
```

minify

Type: boolean
Default: true in production mode, otherwise false

Controls whether the generated HTML is minified after template rendering and tag injection. An explicit value overrides the mode-dependent default.

new rspack.HtmlRspackPlugin({
  minify: false,
});

favicon

Type: string
Default: undefined

Sets the path of a favicon file. Relative paths are resolved from the Rspack context. The plugin emits the file at the output root using its basename and generates a <link rel="icon"> tag whose URL follows publicPath.

When omitted, no favicon asset or tag is generated. With inject: false, the asset is still emitted and exposed as htmlRspackPlugin.files.favicon, but the <link> tag is not inserted automatically.

new rspack.HtmlRspackPlugin({
  favicon: './src/favicon.ico',
});

Generated HTML fragment:

<link href="favicon.ico" rel="icon" />

hash

Type: boolean
Default: undefined

If true, appends the Rspack compilation hash as a query string to generated JavaScript, CSS, and favicon URLs. This changes references in the HTML, not the emitted asset filenames. When omitted or false, the plugin leaves those URLs unchanged.

new rspack.HtmlRspackPlugin({
  hash: true,
});

Template syntax

The built-in template engine supports EJS-style interpolation and basic control flow, but it does not execute arbitrary JavaScript. The following examples show the commonly used forms.

Escaped output `<%-`

Escapes the content within the interpolation:

ejs

<p>Hello, <%- name %>.</p>
<p>Hello, <%- 'the Most Honorable ' + name %>.</p>

locals

{
  "name": "Rspack<y>"
}

html

<p>Hello, Rspack&lt;y&gt;.</p>
<p>Hello, the Most Honorable Rspack&lt;y&gt;.</p>

Unescaped output `<%=`

Does not escape the content within the interpolation:

ejs

<p>Hello, <%- myHtml %>.</p>
<p>Hello, <%= myHtml %>.</p>

<p>Hello, <%- myMaliciousHtml %>.</p>
<p>Hello, <%= myMaliciousHtml %>.</p>

locals

{
  "myHtml": "<strong>Rspack</strong>",
  "myMaliciousHtml": "</p><script>document.write()</script><p>"
}

html

<p>Hello, &lt;strong&gt;Rspack&lt;/strong&gt;.</p>
<p>Hello, <strong>Rspack</strong>.</p>

<p>Hello, &lt;/p&gt;&lt;script&gt;document.write()&lt;/script&gt;&lt;p&gt;.</p>
<p>Hello,</p>
<script>
  document.write();
</script>
<p>.</p>

Control statements

The following example combines for in iteration with an if condition:

ejs

<% for tag in htmlRspackPlugin.tags.headTags { %>
  <% if tag.tagName=="script" { %>
    <%= toHtml(tag) %>
  <% } %>
<% } %>

Hooks

HtmlRspackPlugin exposes hooks for modifying generated tags and HTML. Call rspack.HtmlRspackPlugin.getCompilationHooks to access them:

Hook data exposes the original constructor options as data.plugin.options. Additional custom fields are preserved there for hook consumers but do not affect HTML generation by themselves.

rspack.config.mjs

const HtmlModifyPlugin = {
  apply(compiler) {
    compiler.hooks.compilation.tap('HtmlModifyPlugin', (compilation) => {
      const hooks = rspack.HtmlRspackPlugin.getCompilationHooks(compilation);
      // hooks.beforeAssetTagGeneration.tapPromise()
      // hooks.alterAssetTags.tapPromise()
      // hooks.alterAssetTagGroups.tapPromise()
      // hooks.afterTemplateExecution.tapPromise()
      // hooks.beforeEmit.tapPromise()
      // hooks.afterEmit.tapPromise()
    });
  },
};

export default {
  plugins: [new rspack.HtmlRspackPlugin(), HtmlModifyPlugin],
};

beforeAssetTagGeneration

This hook runs after the plugin collects asset URLs from the compilation and before it creates tags.

Modify assets.js, assets.css, or assets.favicon to add or replace URLs used to create tags. Values added by the hook are used as-is: the hook does not prepend publicPath or emit the referenced files.

Type: AsyncSeriesWaterfallHook<[BeforeAssetTagGenerationData]>

Parameters:

type BeforeAssetTagGenerationData = {
  assets: {
    publicPath: string;
    js: Array<string>;
    css: Array<string>;
    favicon?: string;
    jsIntegrity?: Array<string | undefined | null>;
    cssIntegrity?: Array<string | undefined | null>;
  };
  outputName: string;
  plugin: {
    options: HtmlRspackPluginOptions;
  };
};

Warning

Only changes to assets.js, assets.css, and assets.favicon affect the tags generated automatically by the plugin. Other fields do not affect automatic tag generation, but templates can still read them through htmlRspackPlugin.files.

The following code adds the URL extra-script.js, which produces a <script defer src="extra-script.js"></script> tag in the final HTML.

rspack.config.mjs

const AddScriptPlugin = {
  apply(compiler) {
    compiler.hooks.compilation.tap('AddScriptPlugin', (compilation) => {
      const hooks = rspack.HtmlRspackPlugin.getCompilationHooks(compilation);
      hooks.beforeAssetTagGeneration.tapPromise(
        'AddScriptPlugin',
        async (data) => {
          data.assets.js.push('extra-script.js');
        },
      );
    });
  },
};

export default {
  plugins: [new rspack.HtmlRspackPlugin(), AddScriptPlugin],
};

alterAssetTags

This hook runs after asset tags are created and before they are assigned to <head> or <body>.

Modify assetTags to add, remove, or update tags.

Type: AsyncSeriesWaterfallHook<[AlterAssetTagsData]>

Parameters:

type HtmlTag = {
  tagName: string;
  attributes: Record<string, string | boolean | undefined | null>;
  voidTag: boolean;
  innerHTML?: string;
  asset?: string;
};

type AlterAssetTagsData = {
  assetTags: {
    scripts: Array<HtmlTag>;
    styles: Array<HtmlTag>;
    meta: Array<HtmlTag>;
  };
  publicPath: string;
  outputName: string;
  plugin: {
    options: HtmlRspackPluginOptions;
  };
};

Warning

Only changes to assetTags affect the generated HTML. Changes to other fields are ignored by this plugin.

Attribute names are normalized to lowercase. Attribute values are handled as follows:

true: Adds a valueless attribute, for example <script defer specialattribute src="main.js"></script>.
String: Adds an attribute with that value, for example <script defer specialattribute="some value" src="main.js"></script>.
false, undefined, or null: Removes the attribute.

The following code adds the specialAttribute attribute to every <script> tag:

rspack.config.mjs

const AddAttributePlugin = {
  apply(compiler) {
    compiler.hooks.compilation.tap('AddAttributePlugin', (compilation) => {
      const hooks = rspack.HtmlRspackPlugin.getCompilationHooks(compilation);
      hooks.alterAssetTags.tapPromise('AddAttributePlugin', async (data) => {
        data.assetTags.scripts = data.assetTags.scripts.map((tag) => {
          if (tag.tagName === 'script') {
            tag.attributes.specialAttribute = true;
          }
          return tag;
        });
      });
    });
  },
};

export default {
  plugins: [new rspack.HtmlRspackPlugin(), AddAttributePlugin],
};

alterAssetTagGroups

This hook runs after tags are grouped for <head> and <body>, but before the template is rendered.

Modify headTags and bodyTags to move or update the grouped tags.

Type: AsyncSeriesWaterfallHook<[AlterAssetTagGroupsData]>

Parameters:

type AlterAssetTagGroupsData = {
  headTags: Array<HtmlTag>;
  bodyTags: Array<HtmlTag>;
  publicPath: string;
  outputName: string;
  plugin: {
    options: HtmlRspackPluginOptions;
  };
};

Warning

Only changes to headTags and bodyTags affect the generated HTML. Changes to other fields are ignored by this plugin.

The following code moves all <script> tags from <body> to <head>:

rspack.config.mjs

const MoveTagsPlugin = {
  apply(compiler) {
    compiler.hooks.compilation.tap('MoveTagsPlugin', (compilation) => {
      const hooks = rspack.HtmlRspackPlugin.getCompilationHooks(compilation);
      hooks.alterAssetTagGroups.tapPromise('MoveTagsPlugin', async (data) => {
        const scripts = data.bodyTags.filter((tag) => tag.tagName === 'script');
        data.headTags.push(...scripts);
        data.bodyTags = data.bodyTags.filter((tag) => tag.tagName !== 'script');
      });
    });
  },
};

export default {
  plugins: [
    new rspack.HtmlRspackPlugin({
      inject: 'body',
    }),
    MoveTagsPlugin,
  ],
};

afterTemplateExecution

This hook runs after template rendering and before automatic tag injection.

Modify html, headTags, or bodyTags to change the rendered template or the tags that will be injected.

With a function-valued templateContent or a .js/.cjs template, html is the string returned by the template function. With a string or markup file template, it is the result produced by the built-in template engine.

Type: AsyncSeriesWaterfallHook<[AfterTemplateExecutionData]>

Parameters:

type AfterTemplateExecutionData = {
  html: string;
  headTags: Array<HtmlTag>;
  bodyTags: Array<HtmlTag>;
  outputName: string;
  plugin: {
    options: HtmlRspackPluginOptions;
  };
};

Warning

Only changes to html, headTags, and bodyTags affect the generated HTML. Changes to other fields are ignored by this plugin.

The following code adds Injected by plugin at the end of <body>. The tags are then injected after that text, producing Injected by plugin<script defer src="main.js"></script></body>:

rspack.config.mjs

const InjectContentPlugin = {
  apply(compiler) {
    compiler.hooks.compilation.tap('InjectContentPlugin', (compilation) => {
      const hooks = rspack.HtmlRspackPlugin.getCompilationHooks(compilation);
      hooks.afterTemplateExecution.tapPromise(
        'InjectContentPlugin',
        async (data) => {
          data.html = data.html.replace('</body>', 'Injected by plugin</body>');
        },
      );
    });
  },
};

export default {
  plugins: [
    new rspack.HtmlRspackPlugin({
      inject: 'body',
    }),
    InjectContentPlugin,
  ],
};

beforeEmit

This hook runs immediately before the HTML asset is emitted and is the final chance to modify its content.

Type: AsyncSeriesWaterfallHook<[BeforeEmitData]>

Parameters:

type BeforeEmitData = {
  html: string;
  outputName: string;
  plugin: {
    options: HtmlRspackPluginOptions;
  };
};

Warning

Only changes to html affect the emitted asset. Changes to other fields are ignored by this plugin.

The following code adds Injected by plugin at the end of <body>. The final sequence is <script defer src="main.js"></script>Injected by plugin</body>:

rspack.config.mjs

const InjectContentPlugin = {
  apply(compiler) {
    compiler.hooks.compilation.tap('InjectContentPlugin', (compilation) => {
      const hooks = rspack.HtmlRspackPlugin.getCompilationHooks(compilation);
      hooks.beforeEmit.tapPromise('InjectContentPlugin', async (data) => {
        data.html = data.html.replace('</body>', 'Injected by plugin</body>');
      });
    });
  },
};

export default {
  plugins: [
    new rspack.HtmlRspackPlugin({
      inject: 'body',
    }),
    InjectContentPlugin,
  ],
};

afterEmit

This hook runs after the HTML asset is emitted and is intended for notification only.

Type: AsyncSeriesWaterfallHook<[AfterEmitData]>

Parameters:

type AfterEmitData = {
  outputName: string;
  plugin: {
    options: HtmlRspackPluginOptions;
  };
};

#HtmlRspackPlugin

#Examples

#Default output

#Generate multiple HTML files

#Module scripts

#Production minification

#Use a template file

#Use template string

#Use template function

#Template parameters

#Options

#title

#filename

#template

#templateContent

#templateParameters

#inject

#publicPath

#base

#scriptLoading

#chunks

#excludeChunks

#chunksSortMode

#minify

#favicon

#meta

#hash

#Template syntax

#Escaped output <%-

#Unescaped output <%=

#Control statements

#Hooks

#beforeAssetTagGeneration

#alterAssetTags

#alterAssetTagGroups

#afterTemplateExecution

#beforeEmit

#afterEmit

HtmlRspackPlugin

Examples

Default output

Generate multiple HTML files

Module scripts

Production minification

Use a template file

Use template string

Use template function

Template parameters

Options

title

filename

template

templateContent

templateParameters

inject

publicPath

base

scriptLoading

chunks

excludeChunks

chunksSortMode

minify

favicon

meta

hash

Template syntax

Escaped output `<%-`

Unescaped output `<%=`

Control statements

Hooks

beforeAssetTagGeneration

alterAssetTags

alterAssetTagGroups

afterTemplateExecution

beforeEmit

afterEmit