Function capture

packages/svelte/src/internal/client/reactivity/async.js:130–157

()

 * causes `b` to be registered as a dependency).
 */
export function capture() {
	var previous_effect = /** @type {Effect} */ (active_effect);
	var previous_reaction = active_reaction;
	var previous_component_context = component_context;
	var previous_batch = /** @type {Batch} */ (current_batch);

	if (DEV) {
		var previous_dev_stack = dev_stack;
	}

	return function restore(activate_batch = true) {
		set_active_effect(previous_effect);
		set_active_reaction(previous_reaction);
		set_component_context(previous_component_context);

		if (activate_batch && (previous_effect.f & DESTROYED) === 0) {
			// TODO we only need optional chaining here because `{#await ...}` blocks
			// are anomalous. Once we retire them we can get rid of it
			previous_batch?.activate();
			previous_batch?.apply();
		}

		if (DEV) {
			set_reactivity_loss_tracker(null);
			set_dev_stack(previous_dev_stack);
		}
	};
}

/**
 * Wraps an `await` expression in such a way that the effect context that was