setup_select_synchronization() — svelte Function Reference

Source Code

packages/svelte/src/compiler/phases/3-transform/client/visitors/RegularElement.js lines 510–558

function setup_select_synchronization(value_binding, context) {
	if (context.state.analysis.runes) return;

	let bound = value_binding.expression;

	if (bound.type === 'SequenceExpression') {
		return;
	}

	while (bound.type === 'MemberExpression') {
		bound = /** @type {Identifier | MemberExpression} */ (bound.object);
	}

	/** @type {string[]} */
	const names = [];

	for (const [name, refs] of context.state.scope.references) {
		if (
			refs.length > 0 &&
			// prevent infinite loop
			name !== bound.name
		) {
			names.push(name);
		}
	}

	const invalidator = b.call(
		'$.invalidate_inner_signals',
		b.thunk(
			b.block(
				names.map((name) => {
					const serialized = build_getter(b.id(name), context.state);
					return b.stmt(serialized);
				})
			)
		)
	);

	context.state.init.push(
		b.stmt(
			b.call(
				'$.template_effect',
				b.thunk(
					b.block([b.stmt(/** @type {Expression} */ (context.visit(bound))), b.stmt(invalidator)])
				)
			)
		)
	);
}