Modular programming, essential in modern software design, divides a program into separate code modules, necessitating a module bundler to merge them for web distribution. Traditional JavaScript bundlers like WebPack, Rollup, and Parcel, though popular, often suffer from performance issues due to being JavaScript-based. Esbuild, a new JavaScript bundler created by Evan Wallace and written in Go, addresses these speed concerns by fully parallelizing parsing, printing, and source map generation, making it 10 to 100 times faster than its competitors. Despite its impressive speed, esbuild is a small open-source project maintained by a single developer, and while it offers robust support for common tasks like JS module bundling and JSX conversion, it has not yet been widely adopted in production, indicating potential risks and bugs. Nonetheless, esbuild's potential to revolutionize JavaScript bundling with its remarkable performance makes it a tool worth monitoring.