[Feature Request] Move to separate import paths to allow better tree-shaking / payload size reduction

[acorncom]

Is your feature request related to a problem? Please describe.
When adding TerraDraw to an existing client app, I was surprised to see gzipped bundle size jump by about 40kb. If combined in with a larger app payload, that size reduces due to compression, but it's still larger than I'd expected. See https://bundlephobia.com/package/terra-draw@1.20.0 for some details. It's also sobering to see a slow but steady rise in bundle size as new features are added

Describe your proposed idea for the solution to this problem
Rather than exporting all potential imports from one central file, we could fairly easily unlock tree-shaking benefits by setting up export paths (import LineStringMode from 'terra-draw/modes/linestring or equivalent) This would also have the added benefit of making public api clearer.

This could be rolled out in such a way that existing consumers aren't affected (we leave the primary export system alone) but could add a note to the changelog about new export paths that folks can opt into if they care. Happy to brainstorm about potential export paths, roll out plan or helping pitch in on the work if desired.

Describe alternatives you've considered
We could leave this unchanged for now, not sure I see other clear alternatives

[JamesLMilner]

Firstly thanks for the input and thinking about this. To my understanding most modern bundlers will be able to treeshake imports, i.e. if you do:

import { TerraDrawPointMode, TerraDraw } from "terra-draw";

Only those three classes will appear in your bundle. So if you use all the modes you will reach the full bundle size, but I imagine most users wouldn't hit that. I did a test with the above code and the bundle came in at 10.8 kB (gzip).

As any project, I'd love to have less code and smaller bundle sizes. Terra Draw is 33.6kB minified and gzipped, which probably isn't great. For context these are the sizes of the open source mapping libraries:

• MapLibre - 258.6kB
• Leaflet - 42kB
• OpenLayers - 151.9kB

I'm open to ideas to reduce the bundle size but not sure that tree-shaking is actually an issue here.

[acorncom]

Interesting to see how different your numbers were, I tested this yesterday with Vite to double-check what I was seeing and saw results more inline with what I posted. But could be I had it misconfigured. Will re-try them and post back here. Which bundler were you using with your test above?