Sha256: f0197aa30a2144f6fe212169f49d8c8b5a99f3741c7912a9f27b555316b9c5bd
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Size: 1.87 KB
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Contents
/**
* Mitt: Tiny (~200b) functional event emitter / pubsub.
* @name mitt
* @returns {Mitt}
*/
export default function mitt(all) {
all = all || new Map();
return {
/**
* A Map of event names to registered handler functions.
*/
all,
/**
* Register an event handler for the given type.
* @param {string|symbol} 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, handler) {
const handlers = all.get(type);
const added = handlers && handlers.push(handler);
if (!added) {
all.set(type, [handler]);
}
},
/**
* Remove an event handler for the given type.
* @param {string|symbol} type Type of event to unregister `handler` from, or `"*"`
* @param {Function} handler Handler function to remove
* @memberOf mitt
*/
off(type, handler) {
const handlers = all.get(type);
if (handlers) {
handlers.splice(handlers.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|symbol} type The event type to invoke
* @param {Any} [evt] Any value (object is recommended and powerful), passed to each handler
* @memberOf mitt
*/
emit(type, evt) {
(all.get(type) || []).slice().map((handler) => { handler(evt); });
(all.get('*') || []).slice().map((handler) => { handler(type, evt); });
}
};
}
//# sourceMappingURL=index.js.map
Version data entries
6 entries across 6 versions & 1 rubygems