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{"ast":null,"code":"import _toConsumableArray from \"@babel/runtime/helpers/toConsumableArray\";\nimport * as React from 'react';\nexport default function useEventEmitter(listen) {\n var listenRef = React.useRef(listen);\n React.useEffect(function () {\n listenRef.current = listen;\n });\n var listeners = React.useRef(Object.create(null));\n var create = React.useCallback(function (target) {\n var removeListener = function removeListener(type, callback) {\n var callbacks = listeners.current[type] ? listeners.current[type][target] : undefined;\n if (!callbacks) {\n return;\n }\n var index = callbacks.indexOf(callback);\n if (index > -1) {\n callbacks.splice(index, 1);\n }\n };\n var addListener = function addListener(type, callback) {\n listeners.current[type] = listeners.current[type] || {};\n listeners.current[type][target] = listeners.current[type][target] || [];\n listeners.current[type][target].push(callback);\n var removed = false;\n return function () {\n if (!removed) {\n removed = true;\n removeListener(type, callback);\n }\n };\n };\n return {\n addListener: addListener,\n removeListener: removeListener\n };\n }, []);\n var emit = React.useCallback(function (_ref) {\n var _ref2;\n var _items$target, _listenRef$current;\n var type = _ref.type,\n data = _ref.data,\n target = _ref.target,\n canPreventDefault = _ref.canPreventDefault;\n var items = listeners.current[type] || {};\n var callbacks = target !== undefined ? (_items$target = items[target]) === null || _items$target === void 0 ? void 0 : _items$target.slice() : (_ref2 = []).concat.apply(_ref2, _toConsumableArray(Object.keys(items).map(function (t) {\n return items[t];\n }))).filter(function (cb, i, self) {\n return self.lastIndexOf(cb) === i;\n });\n var event = {\n get type() {\n return type;\n }\n };\n if (target !== undefined) {\n Object.defineProperty(event, 'target', {\n enumerable: true,\n get: function get() {\n return target;\n }\n });\n }\n if (data !== undefined) {\n Object.defineProperty(event, 'data', {\n enumerable: true,\n get: function get() {\n return data;\n }\n });\n }\n if (canPreventDefault) {\n var defaultPrevented = false;\n Object.defineProperties(event, {\n defaultPrevented: {\n enumerable: true,\n get: function get() {\n return defaultPrevented;\n }\n },\n preventDefault: {\n enumerable: true,\n value: function value() {\n defaultPrevented = true;\n }\n }\n });\n }\n (_listenRef$current = listenRef.current) === null || _listenRef$current === void 0 ? 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listeners.current[type][target] : undefined;\n if (!callbacks) {\n return;\n }\n const index = callbacks.indexOf(callback);\n if (index > -1) {\n callbacks.splice(index, 1);\n }\n };\n const addListener = (type, callback) => {\n listeners.current[type] = listeners.current[type] || {};\n listeners.current[type][target] = listeners.current[type][target] || [];\n listeners.current[type][target].push(callback);\n let removed = false;\n return () => {\n // Prevent removing other listeners when unsubscribing same listener multiple times\n if (!removed) {\n removed = true;\n removeListener(type, callback);\n }\n };\n };\n return {\n addListener,\n removeListener\n };\n }, []);\n const emit = React.useCallback(_ref => {\n var _items$target, _listenRef$current;\n let {\n type,\n data,\n target,\n canPreventDefault\n } = _ref;\n const items = listeners.current[type] || {};\n\n // Copy the current list of callbacks in case they are mutated during execution\n const callbacks = target !== undefined ? (_items$target = items[target]) === null || _items$target === void 0 ? void 0 : _items$target.slice() : [].concat(...Object.keys(items).map(t => items[t])).filter((cb, i, self) => self.lastIndexOf(cb) === i);\n const event = {\n get type() {\n return type;\n }\n };\n if (target !== undefined) {\n Object.defineProperty(event, 'target', {\n enumerable: true,\n get() {\n return target;\n }\n });\n }\n if (data !== undefined) {\n Object.defineProperty(event, 'data', {\n enumerable: true,\n get() {\n return data;\n }\n });\n }\n if (canPreventDefault) {\n let defaultPrevented = false;\n Object.defineProperties(event, {\n defaultPrevented: {\n enumerable: true,\n get() {\n return defaultPrevented;\n }\n },\n preventDefault: {\n enumerable: true,\n value() {\n defaultPrevented = true;\n }\n }\n });\n }\n (_listenRef$current = listenRef.current) === null || _listenRef$current === void 0 ? void 0 : _listenRef$current.call(listenRef, event);\n callbacks === null || callbacks === void 0 ? void 0 : callbacks.forEach(cb => cb(event));\n return event;\n }, []);\n return React.useMemo(() => ({\n create,\n emit\n }), [create, emit]);\n}\n//# sourceMappingURL=useEventEmitter.js.map"]},"metadata":{},"sourceType":"module"} |