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- var wellKnownSymbol = require('../internals/well-known-symbol');
- var ITERATOR = wellKnownSymbol('iterator');
- var SAFE_CLOSING = false;
- try {
- var called = 0;
- var iteratorWithReturn = {
- next: function () {
- return { done: !!called++ };
- },
- 'return': function () {
- SAFE_CLOSING = true;
- }
- };
- iteratorWithReturn[ITERATOR] = function () {
- return this;
- };
- // eslint-disable-next-line es-x/no-array-from, no-throw-literal -- required for testing
- Array.from(iteratorWithReturn, function () { throw 2; });
- } catch (error) { /* empty */ }
- module.exports = function (exec, SKIP_CLOSING) {
- if (!SKIP_CLOSING && !SAFE_CLOSING) return false;
- var ITERATION_SUPPORT = false;
- try {
- var object = {};
- object[ITERATOR] = function () {
- return {
- next: function () {
- return { done: ITERATION_SUPPORT = true };
- }
- };
- };
- exec(object);
- } catch (error) { /* empty */ }
- return ITERATION_SUPPORT;
- };
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