Learn more: https://www.voitanos.io/blog/sharepoint-framework-optimize-webpack-code-splitting/

readme.md

This is my gist

It's the greatest gist the world has seen

Well, it's really just from my article: Webpack Magic in SPFx: Optimize Bundles with Code Splitting

webpart-snippet.ts

private _createList(): void {
  //eslint-disable-next-line @typescript-eslint/no-floating-promises
  ( async () => {
    const module = await import (
      /* webpackChunkName: 'list-manager-service' */
      '../../services/ListManagerService'
    );
    const listManager = new module.ListManagerService(
      this.context.pageContext.web.absoluteUrl,
      this.context.spHttpClient);
    await listManager.createList();
  })();
}