diff options
Diffstat (limited to 'src/index.ts')
| -rw-r--r-- | src/index.ts | 14 |
1 files changed, 7 insertions, 7 deletions
diff --git a/src/index.ts b/src/index.ts index e640292..c681fd0 100644 --- a/src/index.ts +++ b/src/index.ts @@ -2,8 +2,8 @@ export type EventType = string | symbol; // An event handler can take an optional event argument // and should not return a value -export type Handler = (event?: any) => void; -export type WildcardHandler = (type: EventType, event?: any) => void +export type Handler<T = any> = (event?: T) => void; +export type WildcardHandler = (type: EventType, event?: any) => void; // An array of all currently registered event handlers for a type export type EventHandlerList = Array<Handler>; @@ -13,10 +13,10 @@ export type WildCardEventHandlerList = Array<WildcardHandler>; export type EventHandlerMap = Map<EventType, EventHandlerList | WildCardEventHandlerList>; export interface Emitter { - on(type: EventType, handler: Handler): void; + on<T = any>(type: EventType, handler: Handler<T>): void; on(type: '*', handler: WildcardHandler): void; - off(type: EventType, handler: Handler): void; + off<T = any>(type: EventType, handler: Handler<T>): void; off(type: '*', handler: WildcardHandler): void; emit<T = any>(type: EventType, event?: T): void; @@ -38,7 +38,7 @@ export default function mitt(all?: EventHandlerMap): Emitter { * @param {Function} handler Function to call in response to given event * @memberOf mitt */ - on(type: EventType, handler: Handler) { + on<T = any>(type: EventType, handler: Handler<T>) { const handlers = all.get(type); const added = handlers && handlers.push(handler); if (!added) { @@ -53,7 +53,7 @@ export default function mitt(all?: EventHandlerMap): Emitter { * @param {Function} handler Handler function to remove * @memberOf mitt */ - off(type: EventType, handler: Handler) { + off<T = any>(type: EventType, handler: Handler<T>) { const handlers = all.get(type); if (handlers) { handlers.splice(handlers.indexOf(handler) >>> 0, 1); @@ -70,7 +70,7 @@ export default function mitt(all?: EventHandlerMap): Emitter { * @param {Any} [evt] Any value (object is recommended and powerful), passed to each handler * @memberOf mitt */ - emit(type: EventType, evt: any) { + emit<T = any>(type: EventType, evt: T) { ((all.get(type) || []) as EventHandlerList).slice().map((handler) => { handler(evt); }); ((all.get('*') || []) as WildCardEventHandlerList).slice().map((handler) => { handler(type, evt); }); } |