ss

jiangping

2025-07-04 a95b1f6e57354b0798c0043f986a44f523723d32

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
'use strict';
var getBuiltIn = require('../internals/get-built-in');
var uncurryThis = require('../internals/function-uncurry-this');
 
var Symbol = getBuiltIn('Symbol');
var keyFor = Symbol.keyFor;
var thisSymbolValue = uncurryThis(Symbol.prototype.valueOf);
 
// `Symbol.isRegisteredSymbol` method
// https://tc39.es/proposal-symbol-predicates/#sec-symbol-isregisteredsymbol
module.exports = Symbol.isRegisteredSymbol || function isRegisteredSymbol(value) {
  try {
    return keyFor(thisSymbolValue(value)) !== undefined;
  } catch (error) {
    return false;
  }
};