Function event_handle

packages/svelte/src/internal/client/render.js:222–255

(events)

		/** @param {Array<string>} events */
		var event_handle = (events) => {
			for (var i = 0; i < events.length; i++) {
				var event_name = events[i];

				if (registered_events.has(event_name)) continue;
				registered_events.add(event_name);

				var passive = is_passive_event(event_name);

				// Add the event listener to both the container and the document.
				// The container listener ensures we catch events from within in case
				// the outer content stops propagation of the event.
				//
				// The document listener ensures we catch events that originate from elements that were
				// manually moved outside of the container (e.g. via manual portals).
				for (const node of [target, document]) {
					var counts = listeners.get(node);

					if (counts === undefined) {
						counts = new Map();
						listeners.set(node, counts);
					}

					var count = counts.get(event_name);

					if (count === undefined) {
						node.addEventListener(event_name, handle_event_propagation, { passive });
						counts.set(event_name, 1);
					} else {
						counts.set(event_name, count + 1);
					}
				}
			}
		};

		event_handle(array_from(all_registered_events));
		root_event_handles.add(event_handle);