docs: svelte usage example

Author: patte

docs/svelte.md

@@ -0,0 +1,35 @@
+# How to render in svelte
+
+Here is an example of a reusable component for svelte 5:
+
+```svelte
+<script lang="ts">
+	import { create } from 'jsondiffpatch';
+	import { format as formatHtml } from 'jsondiffpatch/formatters/html';
+	import 'jsondiffpatch/formatters/styles/html.css';
+
+	let {
+		left,
+		right,
+		diffOptions = undefined,
+		hideUnchangedValues = false,
+	}: {
+		left: unknown;
+		right: unknown;
+		diffOptions?: Parameters<typeof create>[0] | undefined;
+		hideUnchangedValues?: boolean;
+	} = $props();
+
+	let htmlDiff = $derived.by(() => {
+		const jdp = create(diffOptions ?? {});
+		const delta = jdp.diff(left, right);
+		return formatHtml(delta, left);
+	});
+</script>
+
+<div class={`json-diff-container ${hideUnchangedValues ? 'jsondiffpatch-unchanged-hidden' : ''}`}>
+	<div class="jsondiffpatch-result" aria-label="Visual JSON diff">
+		{@html htmlDiff}
+	</div>
+</div>
+```