Options for pre-bundling, transformation, and minification. Rollup, bundling, and limited chunk control. SWC for React, but complexity with multiple bundlers causing issues for maintainers and developers. Limitations in bundlers, features V8 needs. Improving build times with Rust. Introducing Roldown with rollup's API, compatibility, speed, and advanced chunking. Features like module types, lazy barrel optimization, HMR, and built-in minifier for a performant bundle. Ensuring Rust-based bundler compatibility with JavaScript ecosystem. Introduction of Swangular for efficient plugin handling. Native Rust plugins support with module resolution, aliases, TypeScript JSX transform, dynamic imports. Integration with underlying minifier, transformer, linter, and formatter for tool chain V+.