Parallel Build Without Build Worker

Why This Error Occurred

The experimental.parallelServerCompiles and experimental.parallelServerBuildTraces options require that the experimental.webpackBuildWorker option is set to true. These options use workers to improve the parallelization of the build which may improve performance, but the build may use more memory at the same time.

Possible Ways to Fix It

Build workers are enabled by default unless you have a custom webpack config. You can force enable the option by setting experimental.webpackBuildWorker: true in your next.config.js file, but some webpack configuration options may not be compatible.

Useful Links

• Webpack Build Worker automatic opt-out