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Diffstat (limited to 'src/index.js')
| -rw-r--r-- | src/index.js | 63 |
1 files changed, 0 insertions, 63 deletions
diff --git a/src/index.js b/src/index.js deleted file mode 100644 index d9b36f8..0000000 --- a/src/index.js +++ /dev/null @@ -1,63 +0,0 @@ -// @flow -// An event handler can take an optional event argument -// and should not return a value -type EventHandler = (event?: any) => void; -type WildCardEventHandler = (type: string, event?: any) => void - -// An array of all currently registered event handlers for a type -type EventHandlerList = Array<EventHandler>; -type WildCardEventHandlerList = Array<WildCardEventHandler>; -// A map of event types and their corresponding event handlers. -type EventHandlerMap = { - '*'?: WildCardEventHandlerList, - [type: string]: EventHandlerList, -}; - -/** Mitt: Tiny (~200b) functional event emitter / pubsub. - * @name mitt - * @returns {Mitt} - */ -export default function mitt(all: EventHandlerMap) { - all = all || Object.create(null); - - return { - /** - * Register an event handler for the given type. - * - * @param {String} type Type of event to listen for, or `"*"` for all events - * @param {Function} handler Function to call in response to given event - * @memberOf mitt - */ - on(type: string, handler: EventHandler) { - (all[type] || (all[type] = [])).push(handler); - }, - - /** - * Remove an event handler for the given type. - * - * @param {String} type Type of event to unregister `handler` from, or `"*"` - * @param {Function} handler Handler function to remove - * @memberOf mitt - */ - off(type: string, handler: EventHandler) { - if (all[type]) { - all[type].splice(all[type].indexOf(handler) >>> 0, 1); - } - }, - - /** - * Invoke all handlers for the given type. - * If present, `"*"` handlers are invoked after type-matched handlers. - * - * Note: Manually firing "*" handlers is not supported. - * - * @param {String} type The event type to invoke - * @param {Any} [evt] Any value (object is recommended and powerful), passed to each handler - * @memberOf mitt - */ - emit(type: string, evt: any) { - (all[type] || []).slice().map((handler) => { handler(evt); }); - (all['*'] || []).slice().map((handler) => { handler(type, evt); }); - } - }; -} |
