文件操作 - check-correctness-of-iteration.js
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文件: /node_modules/core-js/internals/check-correctness-of-iteration.js
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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 no-throw-literal 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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