CanBeHeldWeakly.js 398 B

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  1. 'use strict';
  2. var KeyForSymbol = require('./KeyForSymbol');
  3. var isObject = require('../helpers/isObject');
  4. // https://262.ecma-international.org/14.0/#sec-canbeheldweakly
  5. module.exports = function CanBeHeldWeakly(v) {
  6. if (isObject(v)) {
  7. return true; // step 1
  8. }
  9. if (typeof v === 'symbol' && typeof KeyForSymbol(v) === 'undefined') {
  10. return true; // step 2
  11. }
  12. return false; // step 3
  13. };