This is a minimal implementation of a custom element (aka web component), to compare the js output size between svelte 3 and svelte 4.

commit description command output
318d240 Svelte 4 npm ci && npm run build index-de4a81a9.js 7.74 kB │ gzip: 3.09 kB
22e7f08 Svelte 3 npm ci && npm run build index-b2272fb8.js 4.58 kB │ gzip: 2.08 kB
3322ade clean install

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