| 1 | const createEventHub = () => ({
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| 2 | hub: Object.create(null),
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| 3 | emit(event, data) {
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| 4 | (this.hub[event] || []).forEach(handler => handler(data));
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| 5 | },
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| 6 | on(event, handler) {
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| 7 | if (!this.hub[event]) this.hub[event] = [];
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| 8 | this.hub[event].push(handler);
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| 9 | },
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| 10 | off(event, handler) {
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| 11 | const i = (this.hub[event] || []).findIndex(h => h === handler);
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| 12 | if (i > -1) this.hub[event].splice(i, 1);
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| 13 | },
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| 14 | clear(keys) {
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| 15 | if (keys) {
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| 16 | for (let key of [].concat(keys)) {
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| 17 | this.hub[key] = [];
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| 18 | }
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| 19 | } else {
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| 20 | this.hub = Object.create(null);
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| 21 | }
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| 22 | },
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| 23 | });
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| 24 |
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| 25 | export default createEventHub;
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