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							|  | "use strict";
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							|  | 
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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"]; |