add_state_transformers() — svelte Function Reference

Source Code

packages/svelte/src/compiler/phases/3-transform/client/visitors/shared/declarations.js lines 18–53

export function add_state_transformers(context) {
	for (const [name, binding] of context.state.scope.declarations) {
		if (
			is_state_source(binding, context.state.analysis) ||
			binding.kind === 'derived' ||
			binding.kind === 'legacy_reactive'
		) {
			context.state.transform[name] = {
				read: binding.declaration_kind === 'var' ? (node) => b.call('$.safe_get', node) : get_value,
				assign: (node, value, proxy = false) => {
					let call = b.call('$.set', node, value, proxy && b.true);

					if (context.state.scope.get(`$${node.name}`)?.kind === 'store_sub') {
						call = b.call('$.store_unsub', call, b.literal(`$${node.name}`), b.id('$$stores'));
					}

					return call;
				},
				mutate: (node, mutation) => {
					if (context.state.analysis.runes) {
						return mutation;
					}

					return b.call('$.mutate', node, mutation);
				},
				update: (node) => {
					return b.call(
						node.prefix ? '$.update_pre' : '$.update',
						node.argument,
						node.operator === '--' && b.literal(-1)
					);
				}
			};
		}
	}
}