first version

src/compiler/compile/compiler_errors.ts

@@ -305,5 +305,9 @@ export default {
 	directive_conflict: (directive1, directive2) => ({
 		code: 'directive-conflict',
 		message: `Cannot use ${directive1} and ${directive2} on the same element`
-  })
+  	}),
+	too_much_forward_event_modifiers: {
+		code: 'too-much-forward-event-modifiers',
+		message: 'Forward-event only accept one modifier (the forward alias)'
+	},
 };

src/compiler/compile/compiler_warnings.ts

@@ -198,5 +198,9 @@ export default {
 	invalid_rest_eachblock_binding: (rest_element_name: string) => ({
 		code: 'invalid-rest-eachblock-binding',
 		message: `...${rest_element_name} operator will create a new object and binding propogation with original object will not work`
-	})
+	}),
+	incorrect_forward_event_modifier: (modifiers: Set<string>) => ({
+		code: 'incorrect-forward-event-modifier',
+		message: `Forward-event only accept one modifier for the forward alias. Event modifiers should not be used here : ${modifiers}`
+	}),
 };

src/compiler/compile/nodes/Element.ts

@@ -13,7 +13,6 @@ import { namespaces } from '../../utils/namespaces';
 import map_children from './shared/map_children';
 import { regex_dimensions, regex_starts_with_newline, regex_non_whitespace_character } from '../../utils/patterns';
 import fuzzymatch from '../../utils/fuzzymatch';
-import list from '../../utils/list';
 import Let from './Let';
 import TemplateScope from './shared/TemplateScope';
 import { INode } from './interfaces';
@@ -118,24 +117,6 @@ const a11y_implicit_semantics = new Map([
 
 const invisible_elements = new Set(['meta', 'html', 'script', 'style']);
 
-const valid_modifiers = new Set([
-	'preventDefault',
-	'stopPropagation',
-	'capture',
-	'once',
-	'passive',
-	'nonpassive',
-	'self',
-	'trusted'
-]);
-
-const passive_events = new Set([
-	'wheel',
-	'touchstart',
-	'touchmove',
-	'touchend',
-	'touchcancel'
-]);
 
 const react_attributes = new Map([
 	['className', 'class'],
@@ -943,44 +924,7 @@ export default class Element extends Node {
 	}
 
 	validate_event_handlers() {
-		const { component } = this;
-
-		this.handlers.forEach(handler => {
-			if (handler.modifiers.has('passive') && handler.modifiers.has('preventDefault')) {
-				return component.error(handler, compiler_errors.invalid_event_modifier_combination('passive', 'preventDefault'));
-			}
-
-			if (handler.modifiers.has('passive') && handler.modifiers.has('nonpassive')) {
-				return component.error(handler, compiler_errors.invalid_event_modifier_combination('passive', 'nonpassive'));
-			}
-
-			handler.modifiers.forEach(modifier => {
-				if (!valid_modifiers.has(modifier)) {
-					return component.error(handler, compiler_errors.invalid_event_modifier(list(Array.from(valid_modifiers))));
-				}
-
-				if (modifier === 'passive') {
-					if (passive_events.has(handler.name)) {
-						if (handler.can_make_passive) {
-							component.warn(handler, compiler_warnings.redundant_event_modifier_for_touch);
-						}
-					} else {
-						component.warn(handler, compiler_warnings.redundant_event_modifier_passive);
-					}
-				}
-
-				if (component.compile_options.legacy && (modifier === 'once' || modifier === 'passive')) {
-					// TODO this could be supported, but it would need a few changes to
-					// how event listeners work
-					return component.error(handler, compiler_errors.invalid_event_modifier_legacy(modifier));
-				}
-			});
-
-			if (passive_events.has(handler.name) && handler.can_make_passive && !handler.modifiers.has('preventDefault') && !handler.modifiers.has('nonpassive')) {
-				// touch/wheel events should be passive by default
-				handler.modifiers.add('passive');
-			}
-		});
+		this.handlers.forEach(h => h.validate());
 	}
 
 	validate_display_directive() {

src/compiler/compile/nodes/EventHandler.ts

@@ -1,19 +1,41 @@
 import Node from './shared/Node';
 import Expression from './shared/Expression';
 import Component from '../Component';
-import { sanitize } from '../../utils/names';
 import { Identifier } from 'estree';
 import TemplateScope from './shared/TemplateScope';
 import { TemplateNode } from '../../interfaces';
+import compiler_errors from '../compiler_errors';
+import compiler_warnings from '../compiler_warnings';
+import list from '../../utils/list';
 
 const regex_contains_term_function_expression = /FunctionExpression/;
 
+const valid_modifiers = new Set([
+	'preventDefault',
+	'stopPropagation',
+	'capture',
+	'once',
+	'passive',
+	'nonpassive',
+	'self',
+	'trusted'
+]);
+
+const passive_events = new Set([
+	'wheel',
+	'touchstart',
+	'touchmove',
+	'touchend',
+	'touchcancel'
+]);
+
 export default class EventHandler extends Node {
 	type: 'EventHandler';
 	name: string;
 	modifiers: Set<string>;
 	expression: Expression;
-	handler_name: Identifier;
+	aliasName?: string;
+	aliasCount: 0;
 	uses_context = false;
 	can_make_passive = false;
 
@@ -47,7 +69,56 @@ export default class EventHandler extends Node {
 				}
 			}
 		} else {
-			this.handler_name = component.get_unique_name(`${sanitize(this.name)}_handler`);
+			if (info.modifiers && info.modifiers.length) {
+				this.aliasCount = info.modifiers.length;
+				this.aliasName = info.modifiers[0];
+			}
+		}
+	}
+
+	validate() {
+		if (this.expression) {
+			if (this.modifiers.has('passive') && this.modifiers.has('preventDefault')) {
+				return this.component.error(this, compiler_errors.invalid_event_modifier_combination('passive', 'preventDefault'));
+			}
+	
+			if (this.modifiers.has('passive') && this.modifiers.has('nonpassive')) {
+				return this.component.error(this, compiler_errors.invalid_event_modifier_combination('passive', 'nonpassive'));
+			}
+	
+			this.modifiers.forEach(modifier => {
+				if (!valid_modifiers.has(modifier)) {
+					return this.component.error(this, compiler_errors.invalid_event_modifier(list(Array.from(valid_modifiers))));
+				}
+	
+				if (modifier === 'passive') {
+					if (passive_events.has(this.name)) {
+						if (this.can_make_passive) {
+							this.component.warn(this, compiler_warnings.redundant_event_modifier_for_touch);
+						}
+					} else {
+						this.component.warn(this, compiler_warnings.redundant_event_modifier_passive);
+					}
+				}
+	
+				if (this.component.compile_options.legacy && (modifier === 'once' || modifier === 'passive')) {
+					// TODO this could be supported, but it would need a few changes to
+					// how event listeners work
+					return this.component.error(this, compiler_errors.invalid_event_modifier_legacy(modifier));
+				}
+			});
+	
+			if (passive_events.has(this.name) && this.can_make_passive && !this.modifiers.has('preventDefault') && !this.modifiers.has('nonpassive')) {
+				// touch/wheel events should be passive by default
+				this.modifiers.add('passive');
+			}
+		} else {
+			if (this.aliasCount > 1) {
+				return this.component.error(this, compiler_errors.too_much_forward_event_modifiers);
+			}
+			if (this.aliasName && valid_modifiers.has(this.aliasName)) {
+				this.component.warn(this, compiler_warnings.incorrect_forward_event_modifier(valid_modifiers));
+			}
 		}
 	}
 

src/compiler/compile/nodes/InlineComponent.ts

@@ -101,13 +101,7 @@ export default class InlineComponent extends Node {
 			this.scope = scope;
 		}
 
-		this.handlers.forEach(handler => {
-			handler.modifiers.forEach(modifier => {
-				if (modifier !== 'once') {
-					return component.error(handler, compiler_errors.invalid_event_modifier_component);
-				}
-			});
-		});
+		this.handlers.forEach(h => h.validate())
 
 		const children = [];
 		for (let i = info.children.length - 1; i >= 0; i--) {

src/compiler/compile/render_dom/wrappers/Element/EventHandler.ts

@@ -1,8 +1,9 @@
 import EventHandler from '../../../nodes/EventHandler';
 import Wrapper from '../shared/Wrapper';
 import Block from '../../Block';
-import { b, x, p } from 'code-red';
+import { x, p, b } from 'code-red';
 import { Expression } from 'estree';
+import { sanitize } from '../../../../utils/names';
 
 const TRUE = x`true`;
 const FALSE = x`false`;
@@ -15,34 +16,34 @@ export default class EventHandlerWrapper {
 		this.node = node;
 		this.parent = parent;
 
-		if (!node.expression) {
-			this.parent.renderer.add_to_context(node.handler_name.name);
-
-			this.parent.renderer.component.partly_hoisted.push(b`
-				function ${node.handler_name.name}(event) {
-					@bubble.call(this, $$self, event);
-				}
-			`);
-		}
 	}
 
+	
 	get_snippet(block: Block) {
-		const snippet = this.node.expression ? this.node.expression.manipulate(block) : block.renderer.reference(this.node.handler_name);
+		return this.node.expression.manipulate(block);
+	}
 
-		if (this.node.reassigned) {
-			block.maintain_context = true;
-			return x`function () { if (@is_function(${snippet})) ${snippet}.apply(this, arguments); }`;
+
+
+	render(block: Block, target: string | Expression, is_comp: boolean = false) {
+		const listen = is_comp ? '@listen_comp' : '@listen';
+		if (!this.node.expression) {
+			const self = this.parent.renderer.add_to_context('$$self');
+			const selfvar = block.renderer.reference(self.name);
+			const aliasName = this.node.aliasName ? `"${this.node.aliasName}"` : null;
+			
+			block.event_listeners.push(x`@bubble(${selfvar}, ${listen}, ${target}, "${this.node.name}", ${aliasName})`);
+			return;
 		}
-		return snippet;
-	}
 
-	render(block: Block, target: string | Expression) {
-		let snippet = this.get_snippet(block);
+		const snippet = this.get_snippet(block);
 
-		if (this.node.modifiers.has('preventDefault')) snippet = x`@prevent_default(${snippet})`;
-		if (this.node.modifiers.has('stopPropagation')) snippet = x`@stop_propagation(${snippet})`;
-		if (this.node.modifiers.has('self')) snippet = x`@self(${snippet})`;
-		if (this.node.modifiers.has('trusted')) snippet = x`@trusted(${snippet})`;
+		let wrappers = [];
+		if (this.node.modifiers.has('trusted')) wrappers.push(x`@trusted`);
+		if (this.node.modifiers.has('self')) wrappers.push(x`@self`);
+		if (this.node.modifiers.has('stopPropagation')) wrappers.push(x`@stop_propagation`);
+		if (this.node.modifiers.has('preventDefault')) wrappers.push(x`@prevent_default`);
+		// TODO : once() on component ????
 
 		const args = [];
 
@@ -57,17 +58,30 @@ export default class EventHandlerWrapper {
 						: p`${opt}: true`
 				) } }`);
 			}
-		} else if (block.renderer.options.dev) {
+		} else if (wrappers.length) {
 			args.push(FALSE);
 		}
-
-		if (block.renderer.options.dev) {
-			args.push(this.node.modifiers.has('preventDefault') ? TRUE : FALSE);
-			args.push(this.node.modifiers.has('stopPropagation') ? TRUE : FALSE);
+		if (wrappers.length) {
+			args.push(x`[${wrappers}]`);
 		}
 
-		block.event_listeners.push(
-			x`@listen(${target}, "${this.node.name}", ${snippet}, ${args})`
-		);
+		if (this.node.reassigned) {
+			const handle = this.node.component.get_unique_name(`${sanitize(this.node.name)}_handle`);
+			block.add_variable(handle);
+
+			const condition = block.renderer.dirty(this.node.expression.dynamic_dependencies());
+
+			block.chunks.update.push(b`
+				if (${condition}) {
+					${handle}.swap(${snippet})
+				}`);
+			block.event_listeners.push(
+				x`${handle} = @listen_swap(${snippet}, (h)=> ${listen}(${target}, "${this.node.name}", h, ${args}))`
+			);
+		} else {
+			block.event_listeners.push(
+				x`${listen}(${target}, "${this.node.name}", ${snippet}, ${args})`
+			);
+		}
 	}
 }

src/compiler/compile/render_dom/wrappers/InlineComponent/index.ts

@@ -396,13 +396,13 @@ export default class InlineComponentWrapper extends Wrapper {
 			return b`@binding_callbacks.push(() => @bind(${this.var}, '${binding.name}', ${id}));`;
 		});
 
-		const munged_handlers = this.node.handlers.map(handler => {
-			const event_handler = new EventHandler(handler, this);
-			let snippet = event_handler.get_snippet(block);
-			if (handler.modifiers.has('once')) snippet = x`@once(${snippet})`;
-
-			return b`${name}.$on("${handler.name}", ${snippet});`;
-		});
+		if (this.node.handlers.length > 0) {
+			const target = x`${name}`;
+			for (const handler of this.node.handlers) {
+				new EventHandler(handler, this)
+					.render(block, target, true);
+			}
+		}
 
 		const mount_target = has_css_custom_properties ? css_custom_properties_wrapper : (parent_node || '#target');
 		const mount_anchor = has_css_custom_properties ? 'null' : (parent_node ? 'null' : '#anchor');
@@ -433,7 +433,6 @@ export default class InlineComponentWrapper extends Wrapper {
 					${name} = @construct_svelte_component(${switch_value}, ${switch_props}(#ctx));
 
 					${munged_bindings}
-					${munged_handlers}
 				}
 			`);
 
@@ -481,7 +480,6 @@ export default class InlineComponentWrapper extends Wrapper {
 						${name} = @construct_svelte_component(${switch_value}, ${switch_props}(#ctx));
 
 						${munged_bindings}
-						${munged_handlers}
 
 						@create_component(${name}.$$.fragment);
 						@transition_in(${name}.$$.fragment, 1);
@@ -515,7 +513,6 @@ export default class InlineComponentWrapper extends Wrapper {
 				${name} = new ${expression}(${component_opts});
 
 				${munged_bindings}
-				${munged_handlers}
 			`);
 
 			if (has_css_custom_properties) {

src/runtime/index.ts

@@ -11,6 +11,7 @@ export {
 	hasContext,
 	tick,
 	createEventDispatcher,
+	onEventListener,
 	SvelteComponentDev as SvelteComponent,
 	SvelteComponentTyped
 	// additional exports added through generate-type-definitions.js

src/runtime/internal/Component.ts

@@ -1,9 +1,9 @@
 import { add_render_callback, flush, schedule_update, dirty_components } from './scheduler';
-import { current_component, set_current_component } from './lifecycle';
+import { current_component, set_current_component, start_callback, stop_callback } from './lifecycle';
 import { blank_object, is_empty, is_function, run, run_all, noop } from './utils';
 import { children, detach, start_hydrating, end_hydrating } from './dom';
 import { transition_in } from './transitions';
-import { T$$ } from './types';
+import { Callback, T$$ } from './types';
 
 export function bind(component, name, callback) {
 	const index = component.$$.props[name];
@@ -95,6 +95,7 @@ export function init(component, options, instance, create_fragment, not_equal, p
 
 		// everything else
 		callbacks: blank_object(),
+		bubbles: blank_object(),
 		dirty,
 		skip_bound: false,
 		root: options.target || parent_component.$$.root
@@ -177,17 +178,22 @@ if (typeof HTMLElement === 'function') {
 			this.$destroy = noop;
 		}
 
-		$on(type, callback) {
-			// TODO should this delegate to addEventListener?
+		$on(type: string, callback: EventListener, options?: boolean | AddEventListenerOptions | EventListenerOptions) {
 			if (!is_function(callback)) {
 				return noop;
 			}
 			const callbacks = (this.$$.callbacks[type] || (this.$$.callbacks[type] = []));
-			callbacks.push(callback);
+			const c: Callback = {f:callback, o:options};
+			callbacks.push(c);
+			
+			start_callback(this as any, type, c);
 	
 			return () => {
-				const index = callbacks.indexOf(callback);
-				if (index !== -1) callbacks.splice(index, 1);
+				const index = callbacks.indexOf(c);
+				if (index !== -1) {
+					callbacks.splice(index, 1);
+					stop_callback(this as any, type, c);
+				}
 			};
 		}
 
@@ -213,16 +219,20 @@ export class SvelteComponent {
 		this.$destroy = noop;
 	}
 
-	$on(type, callback) {
+	$on(type: string, callback: EventListener, options?: boolean | AddEventListenerOptions | EventListenerOptions) {
 		if (!is_function(callback)) {
 			return noop;
 		}
 		const callbacks = (this.$$.callbacks[type] || (this.$$.callbacks[type] = []));
-		callbacks.push(callback);
+		const c: Callback = {f:callback, o:options};
+		callbacks.push(c);
+		
+		start_callback(this as any, type, c);
 
 		return () => {
-			const index = callbacks.indexOf(callback);
+			const index = callbacks.indexOf(c);
 			if (index !== -1) callbacks.splice(index, 1);
+			stop_callback(this as any, type, c);
 		};
 	}
 

src/runtime/internal/dev.ts

@@ -1,6 +1,7 @@
-import { custom_event, append, append_hydration, insert, insert_hydration, detach, listen, attr } from './dom';
+import { custom_event, append, append_hydration, insert, insert_hydration, detach, listen, attr, prevent_default, stop_propagation, trusted, self } from './dom';
 import { SvelteComponent } from './Component';
 import { is_void } from '../../shared/utils/names';
+import { bubble, listen_comp } from './lifecycle';
 
 export function dispatch_dev<T=any>(type: string, detail?: T) {
 	document.dispatchEvent(custom_event(type, { version: '__VERSION__', ...detail }, { bubbles: true }));
@@ -49,20 +50,49 @@ export function detach_after_dev(before: Node) {
 	}
 }
 
-export function listen_dev(node: Node, event: string, handler: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions | EventListenerOptions, has_prevent_default?: boolean, has_stop_propagation?: boolean) {
+function build_modifiers(options?: boolean | AddEventListenerOptions | EventListenerOptions, wrappers?: Function[]) {
 	const modifiers = options === true ? [ 'capture' ] : options ? Array.from(Object.keys(options)) : [];
-	if (has_prevent_default) modifiers.push('preventDefault');
-	if (has_stop_propagation) modifiers.push('stopPropagation');
+	if (wrappers) {
+		if (wrappers.indexOf(prevent_default) >= 0) modifiers.push('preventDefault');
+		if (wrappers.indexOf(stop_propagation) >= 0) modifiers.push('stopPropagation');
+		// ???
+		if (wrappers.indexOf(trusted) >= 0) modifiers.push('trusted');
+		if (wrappers.indexOf(self) >= 0) modifiers.push('self');
+	}
+	return modifiers;
+}
 
+export function listen_dev(node: Node, event: string, handler: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions | EventListenerOptions, wrappers?: Function[]) {
+	const modifiers = build_modifiers(options, wrappers);
 	dispatch_dev('SvelteDOMAddEventListener', { node, event, handler, modifiers });
 
-	const dispose = listen(node, event, handler, options);
+	const dispose = listen(node, event, handler, options, wrappers);
 	return () => {
 		dispatch_dev('SvelteDOMRemoveEventListener', { node, event, handler, modifiers });
 		dispose();
 	};
 }
 
+export function bubble_dev(component: SvelteComponent, listen_func: Function, node: EventTarget|SvelteComponent, type: string, typeName: string = type): Function {
+	dispatch_dev('SvelteComponentAddEventBubble', { component, listen_func, node, type, typeName });
+	const dispose = bubble(component, listen_func, node, type, typeName);
+	return () => {
+		dispatch_dev('SvelteComponentRemoveEventBubble', { component, listen_func, node, type, typeName });
+		dispose();
+	};
+}
+
+export function listen_comp_dev(comp: SvelteComponent, event: string, handler: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions | EventListenerOptions, wrappers?: Function[]) {
+	const modifiers = build_modifiers(options, wrappers);
+	dispatch_dev('SvelteComponentAddEventListener', { comp, event, handler, modifiers });
+
+	const dispose = listen_comp(comp, event, handler, options, wrappers);
+	return () => {
+		dispatch_dev('SvelteComponentRemoveEventListener', { comp, event, handler, modifiers });
+		dispose();
+	};
+}
+
 export function attr_dev(node: Element, attribute: string, value?: string) {
 	attr(node, attribute, value);
 
@@ -144,7 +174,7 @@ export function construct_svelte_component_dev(component, props) {
 type Props = Record<string, any>;
 export interface SvelteComponentDev {
 	$set(props?: Props): void;
-	$on(event: string, callback: ((event: any) => void) | null | undefined): () => void;
+	$on(event: string, callback: ((event: any) => void) | null | undefined, options?: boolean | AddEventListenerOptions | EventListenerOptions): () => void;
 	$destroy(): void;
 	[accessor: string]: any;
 }

src/runtime/internal/dom.ts

@@ -1,4 +1,4 @@
-import { has_prop } from './utils';
+import { has_prop, is_function, noop } from './utils';
 
 // Track which nodes are claimed during hydration. Unclaimed nodes can then be removed from the DOM
 // at the end of hydration without touching the remaining nodes.
@@ -252,9 +252,38 @@ export function empty() {
 	return text('');
 }
 
-export function listen(node: EventTarget, event: string, handler: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions | EventListenerOptions) {
-	node.addEventListener(event, handler, options);
-	return () => node.removeEventListener(event, handler, options);
+export function wrap_handler(handler: EventListenerOrEventListenerObject, wrappers?: Function[]): EventListener {
+	let result = is_function(handler) ? handler : handler.handleEvent.bind(handler);
+	if (wrappers) {
+		for (const fn of wrappers) {
+			result = fn(result);
+		}
+	}
+	return result;
+}
+
+export function listen(node: EventTarget, event: string, handler: EventListenerOrEventListenerObject|null|undefined, options?: boolean | AddEventListenerOptions | EventListenerOptions, wrappers?: Function[]) {
+	if (handler) {
+		handler = wrap_handler(handler, wrappers);
+		node.addEventListener(event, handler, options);
+		return () => node.removeEventListener(event, handler, options);
+	}
+	return noop;
+}
+
+export function listen_swap(handler: EventListenerOrEventListenerObject|null|undefined, factory: (handler:EventListenerOrEventListenerObject) => Function) {
+	let disposeHandle: Function = factory(handler);
+	const dispose = () => {
+		disposeHandle();
+	}
+	dispose.swap = (new_handler:EventListenerOrEventListenerObject) => {
+		if (new_handler !== handler) {
+			disposeHandle();
+			handler = new_handler;
+			disposeHandle = factory(handler);
+		}
+	}
+	return dispose;
 }
 
 export function prevent_default(fn) {

src/runtime/internal/lifecycle.ts

@@ -1,4 +1,7 @@
-import { custom_event } from './dom';
+import { SvelteComponent } from './Component';
+import { custom_event, wrap_handler } from './dom';
+import { Bubble, Callback, CallbackFactory } from './types';
+import { noop } from './utils';
 
 export let current_component;
 
@@ -82,14 +85,14 @@ export function createEventDispatcher<EventMap extends {} = any>(): <
 	const component = get_current_component();
 
 	return (type: string, detail?: any, { cancelable = false } = {}): boolean => {
-		const callbacks = component.$$.callbacks[type];
+		const callbacks: Callback[] = component.$$.callbacks[type];
 
 		if (callbacks) {
 			// TODO are there situations where events could be dispatched
 			// in a server (non-DOM) environment?
 			const event = custom_event(type, detail, { cancelable });
-			callbacks.slice().forEach(fn => {
-				fn.call(component, event);
+			callbacks.slice().forEach(callback => {
+				callback.f.call(component, event);
 			});
 			return !event.defaultPrevented;
 		}
@@ -143,14 +146,93 @@ export function hasContext(key): boolean {
 	return get_current_component().$$.context.has(key);	
 }
 
-// TODO figure out if we still want to support
-// shorthand events, or if we want to implement
-// a real bubbling mechanism
-export function bubble(component, event) {
-	const callbacks = component.$$.callbacks[event.type];
+function start_bubble(type: string, bubble: Bubble, callback: Callback) {
+	const dispose = bubble.f(type, callback.f, callback.o);
+	if (dispose) {
+		bubble.r.set(callback, dispose);
+	}
+}
+
+function start_bubbles(comp : SvelteComponent, bubble: Bubble) {
+	for (const type of Object.keys(comp.$$.callbacks)) {
+		comp.$$.callbacks[type].forEach( callback => { start_bubble(type, bubble, callback); })
+	}
+}
+
+export function start_callback(comp : SvelteComponent, type: string, callback: Callback) {
+	for (const bubbles of [ comp.$$.bubbles[type], comp.$$.bubbles['*'] ]) {
+		if (bubbles) {
+			for(const bubble of bubbles) {
+				start_bubble(type, bubble, callback);
+			}
+		}
+	}
+}
+
+export function stop_callback(comp : SvelteComponent, type: string, callback: Callback) {
+	for (const bubbles of [ comp.$$.bubbles[type], comp.$$.bubbles['*'] ]) {
+		if (bubbles) {
+			for (const bubble of bubbles) {
+				const dispose = bubble.r.get(callback);
+				if (dispose) {
+					dispose();
+					bubble.r.delete(callback);
+				}
+			}
+		}
+	}
+}
+
+function add_bubble(comp: SvelteComponent, type: string, f: CallbackFactory): Function {
+	const bubble : Bubble = {f, r: new Map()};
+	const bubbles = (comp.$$.bubbles[type] || (comp.$$.bubbles[type] = []));
+	bubbles.push(bubble);
+
+	start_bubbles(comp, bubble);
+	
+	return () => {
+		const index = bubbles.indexOf(bubble);
+		if (index !== -1) bubbles.splice(index, 1);
+		for (const dispose of bubble.r.values()) {
+			dispose();
+		}
+	}
+}
+
+export function onEventListener(type: string, fn: CallbackFactory) {
+	add_bubble(get_current_component(), type, fn);
+}
+
+
+export function bubble(component: SvelteComponent, listen_func: Function, node: EventTarget|SvelteComponent, type: string, typeName: string = type): Function {
+	return add_bubble(component, type, (eventType, callback, options) => {
+		let typeToListen: string;
+		if (type === '*') {
+			if (typeName === '*') {
+				typeToListen = eventType;
+			} else if (typeName.startsWith('*')) {
+				const len = typeName.length;
+				if (eventType.endsWith(typeName.substring(1))) {
+					typeToListen = eventType.substring(0, eventType.length - (len-1));
+				}
+			} else if (typeName.endsWith('*')) {
+				const len = typeName.length;
+				if (eventType.startsWith(typeName.substring(0,len-1))) {
+					typeToListen = eventType.substring(len-1);
+				}
+			}
+		} else if (eventType === typeName) {
+			typeToListen = type;
+		}
+		if (typeToListen) {
+			return listen_func(node, typeToListen, callback, options);
+		}
+	});
+}
 
-	if (callbacks) {
-		// @ts-ignore
-		callbacks.slice().forEach(fn => fn.call(this, event));
+export function listen_comp(comp: SvelteComponent, event: string, handler: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions | EventListenerOptions, wrappers?: Function[]) {
+	if (handler) {
+		return comp.$on(event, wrap_handler(handler, wrappers), options);
 	}
+	return noop;
 }

src/runtime/internal/types.ts

@@ -19,12 +19,27 @@ export interface Fragment {
 
 export type FragmentFactory = (ctx: any) => Fragment;
 
+
+export interface Callback {
+	f: EventListener;
+	o?: boolean | AddEventListenerOptions | EventListenerOptions;
+}
+
+export type CallbackFactory = (type: string, callback: EventListener, options: boolean | AddEventListenerOptions | EventListenerOptions | undefined) => Function|void;
+
+export interface Bubble {
+	f: CallbackFactory;
+	r: Map<Callback,Function>;
+}
+
+
 export interface T$$ {
 	dirty: number[];
 	ctx: any[];
 	bound: any;
 	update: () => void;
-	callbacks: any;
+	callbacks: Record<string, Callback[]>;
+	bubbles: Record<string, Bubble[]>;
 	after_update: any[];
 	props: Record<string, 0 | string>;
 	fragment: null | false | Fragment;