output.module

Whether to output JavaScript files in ES modules format.

Tip

This feature is currently experimental and only available when output.target is 'node'.
If you need to build JavaScript libraries in ESM format, we recommend using Rslib, which is an out-of-the-box library development tool built on top of Rsbuild.

Example

When building Node.js bundles, Rsbuild outputs CommonJS format by default. You can set output.module to true to output ES modules format:

rsbuild.config.ts

export default {
  output: {
    target: 'node',
    module: true,
  },
};

To properly run ESM bundles in Node.js, you can choose either of the following approaches:

package.json

{
  "type": "module"
}

rsbuild.config.ts

export default {
  output: {
    filename: {
      js: '[name].mjs',
    },
  },
};