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							"use strict"; | 
						
						
						
						
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							Object.defineProperty(exports, "__esModule", { | 
						
						
						
						
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							    value: true | 
						
						
						
						
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							}); | 
						
						
						
						
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							exports.default = once; | 
						
						
						
						
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							function once(fn) { | 
						
						
						
						
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							    return function () { | 
						
						
						
						
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							        if (fn === null) return; | 
						
						
						
						
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							        var callFn = fn; | 
						
						
						
						
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							        fn = null; | 
						
						
						
						
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							        callFn.apply(this, arguments); | 
						
						
						
						
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							    }; | 
						
						
						
						
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							} | 
						
						
						
						
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							module.exports = exports["default"]; |