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60 lines
1.8 KiB
60 lines
1.8 KiB
// |
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// An event handler can take an optional event argument |
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// and should not return a value |
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// An array of all currently registered event handlers for a type |
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// A map of event types and their corresponding event handlers. |
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/** Mitt: Tiny (~200b) functional event emitter / pubsub. |
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* @name mitt |
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* @returns {Mitt} |
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*/ |
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function mitt(all ) { |
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all = all || Object.create(null); |
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return { |
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/** |
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* Register an event handler for the given type. |
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* |
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* @param {String} type Type of event to listen for, or `"*"` for all events |
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* @param {Function} handler Function to call in response to given event |
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* @memberOf mitt |
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*/ |
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on: function on(type , handler ) { |
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(all[type] || (all[type] = [])).push(handler); |
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}, |
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/** |
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* Remove an event handler for the given type. |
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* |
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* @param {String} type Type of event to unregister `handler` from, or `"*"` |
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* @param {Function} handler Handler function to remove |
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* @memberOf mitt |
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*/ |
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off: function off(type , handler ) { |
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if (all[type]) { |
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all[type].splice(all[type].indexOf(handler) >>> 0, 1); |
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} |
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}, |
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/** |
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* Invoke all handlers for the given type. |
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* If present, `"*"` handlers are invoked after type-matched handlers. |
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* |
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* @param {String} type The event type to invoke |
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* @param {Any} [evt] Any value (object is recommended and powerful), passed to each handler |
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* @memberof mitt |
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*/ |
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emit: function emit(type , evt ) { |
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(all[type] || []).map(function (handler) { handler(evt); }); |
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(all['*'] || []).map(function (handler) { handler(type, evt); }); |
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} |
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}; |
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} |
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export default mitt; |
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//# sourceMappingURL=mitt.es.js.map
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