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targets

  • Type:
type RsbuildTarget = 'web' | 'node' | 'web-worker' | 'service-worker';

type Targets = RsbuildTarget[];
  • Default: ['web']
  • Version: >= 0.2.0

Used to set the build output type for Rsbuild.

Rsbuild supports build multiple target types for running in different target environments. After setting the correct target type, Rsbuild will optimize the build results for the environment, and enable some plugins or configs for the target environment during the build process.

Default Target

By default, the targets is ['web'], and the build result can run in a browser environment.

Rsbuild will read the Browserslist config in the project to determine the range of browsers.

Optional Targets

Apart from 'web', targets can also include the following types:

  • 'node': Build for Node.js environment, usually used in SSR and other scenarios.
  • 'web-worker': Build for Web Worker environment.

For example, to build for the Node.js environment:

export default {
  output: {
    targets: ['node'],
  },
};

Multiple Targets

When targets containing multiple values, Rsbuild will perform multiple builds at the same time.

For example, we can build a browser target and an node target at the same time:

export default {
  output: {
    targets: ['web', 'node'],
  },
};

Node Target

Refers to the build target running in the Node.js environment, usually used in scenarios such as SSR.

When target is set to 'node', Rsbuild will:

  • No HTML files will be generated, and HTML-related logic will not be executed, since HTML is not required by the Node.js environment.
  • CSS code will not be bundled or extracted, but the id information of CSS Modules will be included in the bundle.
  • The default code split strategy will be disabled, but dynamic import can still work.
  • Disable the HMR.
  • Adjust the default value of Browserslist to ['node >= 16'].
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If target is an array, such as building web and node targets at the same time, then the above processing will not affect the web target, The HTML, CSS and other files required for the web target will still be generated correctly.

Web Worker Target

Refers to the build target running in the Web Worker environment.

Web Worker

A web worker is a type of JavaScript program that runs in the background, independently of other scripts, without affecting the performance of the page. This makes it possible to run long-running scripts, such as ones that handle complex calculations or access remote resources, without blocking the user interface or other scripts. Web workers provide an easy way to run tasks in the background and improve the overall performance of web applications.

When target is set to 'web-worker', Rsbuild will:

  • No HTML files will be generated, and HTML-related logic will not be executed, since HTML is not required by the Web Worker environment.
  • CSS code will not be bundled or extracted, but the id information of CSS Modules will be included in the bundle.
  • The default code split strategy will be disabled, and dynamic import can not work, because the Web Worker only runs a single JavaScript file.
  • Disable the HMR.