#source.enableAsyncPreEntry

• Type: boolean
• Default: false

When enabled, Modern.js will inject the modules configured in source.preEntry to the top of the auto-generated entry file (index.jsx) in order.

This option only takes effect when source.enableAsyncEntry is enabled. If async entry is not enabled, this behavior will be skipped and the original builder-side source.preEntry injection remains unchanged.

This option is mainly designed to work with source.enableAsyncEntry: when async entry is enabled, the final build entry becomes bootstrap.jsx, and the builder-side source.preEntry may not be injected into the real entry code. With source.enableAsyncPreEntry enabled, preEntry will be injected into index.jsx (the real entry code), so it also works in async entry scenarios.

Meanwhile, when both source.enableAsyncEntry and source.enableAsyncPreEntry are enabled, Modern.js will not pass source.preEntry into builder config to avoid duplicate injection or injection into an unexpected entry.

#Example

import { defineConfig } from '@modern-js/app-tools';

export default defineConfig({
  source: {
    enableAsyncEntry: true,
    enableAsyncPreEntry: true,
    preEntry: ['./src/pre-a.ts', './src/pre-b.ts'],
  },
});