SnippetBlock() — svelte Function Reference

Source Code

packages/svelte/src/compiler/phases/2-analyze/visitors/SnippetBlock.js lines 11–75

export function SnippetBlock(node, context) {
	context.state.analysis.snippets.add(node);

	validate_block_not_empty(node.body, context);

	if (context.state.analysis.runes) {
		validate_opening_tag(node, context.state, '#');
	}

	for (const arg of node.parameters) {
		if (arg.type === 'RestElement') {
			e.snippet_invalid_rest_parameter(arg);
		}
	}

	context.next({ ...context.state, parent_element: null });

	const can_hoist =
		context.path.length === 1 &&
		context.path[0].type === 'Fragment' &&
		can_hoist_snippet(context.state.scope, context.state.scopes);

	const name = node.expression.name;

	if (can_hoist) {
		const binding = /** @type {Binding} */ (context.state.scope.get(name));
		context.state.analysis.module.scope.declarations.set(name, binding);
	}

	node.metadata.can_hoist = can_hoist;

	const { path } = context;
	const parent = path.at(-2);
	if (!parent) return;

	if (
		parent.type === 'Component' &&
		parent.attributes.some(
			(attribute) =>
				(attribute.type === 'Attribute' || attribute.type === 'BindDirective') &&
				attribute.name === node.expression.name
		)
	) {
		e.snippet_shadowing_prop(node, node.expression.name);
	}

	if (node.expression.name !== 'children') return;

	if (
		parent.type === 'Component' ||
		parent.type === 'SvelteComponent' ||
		parent.type === 'SvelteSelf'
	) {
		if (
			parent.fragment.nodes.some(
				(node) =>
					node.type !== 'SnippetBlock' &&
					(node.type !== 'Text' || node.data.trim()) &&
					node.type !== 'Comment'
			)
		) {
			e.snippet_conflict(node);
		}
	}
}