truncate() — svelte Function Reference

Source Code

packages/svelte/src/compiler/phases/2-analyze/css/css-prune.js lines 163–186

function truncate(node) {
	const i = node.children.findLastIndex(({ metadata, selectors }) => {
		const first = selectors[0];
		return (
			// not after a :global selector
			!metadata.is_global_like &&
			!(first.type === 'PseudoClassSelector' && first.name === 'global' && first.args === null) &&
			// not a :global(...) without a :has/is/where(...) modifier that is scoped
			!metadata.is_global
		);
	});

	return node.children.slice(0, i + 1).map((child) => {
		// In case of `:root.y:has(...)`, `y` is unscoped, but everything in `:has(...)` should be scoped (if not global).
		// To properly accomplish that, we gotta filter out all selector types except `:has`.
		const root = child.selectors.find((s) => s.type === 'PseudoClassSelector' && s.name === 'root');
		if (!root || child.metadata.is_global_like) return child;

		return {
			...child,
			selectors: child.selectors.filter((s) => s.type === 'PseudoClassSelector' && s.name === 'has')
		};
	});
}