Optimizing the output

The path data is written as plain absolute commands. SVGO usually shrinks it by another 25% or so, mostly by switching to relative coordinates and shorthand commands. A ready-made pass lives in a separate entry point so the core library doesn't depend on SVGO. Install svgo (v4) next to it and:

import { outlineSvg } from 'unstroke';
import { optimizeSvg } from 'unstroke/optimize';

const small = optimizeSvg(outlineSvg(svgSource), { precision: 3 });

If you already have an SVGO pipeline, svgoConfig(options) returns the configuration this pass uses, so you can feed it in there instead.

On the command line the same pass is --optimize.