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node_modules/es6-symbol/is-symbol.js 254 Bytes
aaac7fed   liuqimichale   add
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  'use strict';
  
  module.exports = function (x) {
  	if (!x) return false;
  	if (typeof x === 'symbol') return true;
  	if (!x.constructor) return false;
  	if (x.constructor.name !== 'Symbol') return false;
  	return (x[x.constructor.toStringTag] === 'Symbol');
  };