How does Bun's bundler handle minification and compression

Minification

Bun's bundler supports minification to reduce the file size of the generated bundles. Here are a few key points about minification in Bun:

- To enable minification, set the `minify` option when calling `Bun.build()` or use the `--minify` flag with `bun build` [1][2].

- Bun's minification removes whitespace, comments, and renames variables to shorten identifiers. This can significantly reduce the file size[1].

- However, there are some caveats with minification in the current beta version of Bun:
- If minifying multiple entry points, you need to pass them one at a time to `Bun.build()` to avoid an error[3].
- The default minification settings may break the code in some cases. Setting `minify.syntax` to `false` can help[3].

Compression

Bun's bundler also supports compression to further reduce the size of the generated bundles:

- Bun can compress the output files up to 90% in size[5].

- To specify the compression level, use the `--compress` flag with `bun bundle`. For example, `bun bundle app.ts --compress 9` will use maximum compression[5].

- Compression is a separate step from bundling and minification. It is applied after the files are bundled and minified[5].

- Compression helps reduce the time it takes for the browser to download the files, especially for users on slow connections or mobile devices[6].

So in summary, Bun's bundler provides both minification and compression capabilities to optimize the size of the generated JavaScript bundles. Minification removes unnecessary code while compression further shrinks the file size for faster downloads. However, the minification feature still has some limitations in the current beta version.