apply() — svelte Function Reference

Architecture documentation for the apply() function in events.js from the svelte codebase.

Function javascript ClientRuntime Hydration calls 1 called by 6

Entity Profile

ClientRuntime→ Hydration→ apply() — svelte Function Reference

Dependency Diagram

graph TD
  7a2c4b59_fc2a_bb0e_64d7_90ce67611a9c["apply()"]
  2c990bd1_acff_5910_3af2_ab75f655b31b["events.js"]
  7a2c4b59_fc2a_bb0e_64d7_90ce67611a9c -->|defined in| 2c990bd1_acff_5910_3af2_ab75f655b31b
  1ca72ded_14bc_41b5_4ea5_b8dc496dc853["trusted()"]
  1ca72ded_14bc_41b5_4ea5_b8dc496dc853 -->|calls| 7a2c4b59_fc2a_bb0e_64d7_90ce67611a9c
  53354e8d_42d0_70c2_255c_9f5b50649cd7["self()"]
  53354e8d_42d0_70c2_255c_9f5b50649cd7 -->|calls| 7a2c4b59_fc2a_bb0e_64d7_90ce67611a9c
  72948d3d_a35f_64f1_880e_496d39c98799["stopPropagation()"]
  72948d3d_a35f_64f1_880e_496d39c98799 -->|calls| 7a2c4b59_fc2a_bb0e_64d7_90ce67611a9c
  6b9cfdba_ca05_bb2e_0fdb_a6b0b9578ed8["once()"]
  6b9cfdba_ca05_bb2e_0fdb_a6b0b9578ed8 -->|calls| 7a2c4b59_fc2a_bb0e_64d7_90ce67611a9c
  8e27f1e1_9bca_ae6a_933e_b60efce97e52["stopImmediatePropagation()"]
  8e27f1e1_9bca_ae6a_933e_b60efce97e52 -->|calls| 7a2c4b59_fc2a_bb0e_64d7_90ce67611a9c
  1a241ae5_105a_d719_d800_eda3444dbf2a["preventDefault()"]
  1a241ae5_105a_d719_d800_eda3444dbf2a -->|calls| 7a2c4b59_fc2a_bb0e_64d7_90ce67611a9c
  67e61f88_f0df_94e8_9ca2_7858698b5b1e["event_handler_invalid()"]
  7a2c4b59_fc2a_bb0e_64d7_90ce67611a9c -->|calls| 67e61f88_f0df_94e8_9ca2_7858698b5b1e
  style 7a2c4b59_fc2a_bb0e_64d7_90ce67611a9c fill:#6366f1,stroke:#818cf8,color:#fff

Relationship Graph

Source Code

packages/svelte/src/internal/client/dom/elements/events.js lines 305–338

export function apply(
	thunk,
	element,
	args,
	component,
	loc,
	has_side_effects = false,
	remove_parens = false
) {
	let handler;
	let error;

	try {
		handler = thunk();
	} catch (e) {
		error = e;
	}

	if (typeof handler !== 'function' && (has_side_effects || handler != null || error)) {
		const filename = component?.[FILENAME];
		const location = loc ? ` at ${filename}:${loc[0]}:${loc[1]}` : ` in ${filename}`;
		const phase = args[0]?.eventPhase < Event.BUBBLING_PHASE ? 'capture' : '';
		const event_name = args[0]?.type + phase;
		const description = `\`${event_name}\` handler${location}`;
		const suggestion = remove_parens ? 'remove the trailing `()`' : 'add a leading `() =>`';

		w.event_handler_invalid(description, suggestion);

		if (error) {
			throw error;
		}
	}
	handler?.apply(element, args);
}