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react-native-ui-lib

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import _indexOf from "lodash/indexOf"; export default class EventEmitterManager { handlerCallbacks = {}; constructor() { this.handlerCallbacks = {}; } listenOn(eventName, handlerCallback) { if (!this.handlerCallbacks[eventName]) { this.handlerCallbacks[eventName] = []; } if (_indexOf(this.handlerCallbacks[eventName], handlerCallback) === -1) { this.handlerCallbacks[eventName].push(handlerCallback); } } emitEvent(eventName, params = {}) { if (this.handlerCallbacks[eventName]) { this.handlerCallbacks[eventName].forEach(callback => callback(params)); } } removeListeners(eventName) { delete this.handlerCallbacks[eventName]; } removeListener(eventName, listener) { const handlers = this.handlerCallbacks[eventName]; if (handlers) { handlers.forEach((handler, index) => { if (handler === listener) { handlers.splice(index, 1); } }); } } }