shimMissingExports

• Type: boolean
• Default: false

When true, creates shim variables for missing exports instead of throwing an error.

Examples

Enable shimming

export default {
  shimMissingExports: true,
};

Example scenario

module-a.js:

export { nonExistent } from './module-b.js';

module-b.js:

// nonExistent is not actually exported here
export const something = 'value';

With shimMissingExports: false (default), this would throw an error. With shimMissingExports: true, Rolldown will create a shim variable:

// Bundled output (simplified)
const nonExistent = undefined;
export { nonExistent, something };