[6a3a178] | 1 | var global = require('../internals/global');
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| 2 | var shared = require('../internals/shared-store');
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| 3 | var getPrototypeOf = require('../internals/object-get-prototype-of');
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| 4 | var has = require('../internals/has');
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| 5 | var createNonEnumerableProperty = require('../internals/create-non-enumerable-property');
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| 6 | var wellKnownSymbol = require('../internals/well-known-symbol');
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| 7 | var IS_PURE = require('../internals/is-pure');
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| 8 |
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| 9 | var USE_FUNCTION_CONSTRUCTOR = 'USE_FUNCTION_CONSTRUCTOR';
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| 10 | var ASYNC_ITERATOR = wellKnownSymbol('asyncIterator');
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| 11 | var AsyncIterator = global.AsyncIterator;
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| 12 | var PassedAsyncIteratorPrototype = shared.AsyncIteratorPrototype;
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| 13 | var AsyncIteratorPrototype, prototype;
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| 14 |
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| 15 | if (!IS_PURE) {
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| 16 | if (PassedAsyncIteratorPrototype) {
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| 17 | AsyncIteratorPrototype = PassedAsyncIteratorPrototype;
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| 18 | } else if (typeof AsyncIterator == 'function') {
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| 19 | AsyncIteratorPrototype = AsyncIterator.prototype;
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| 20 | } else if (shared[USE_FUNCTION_CONSTRUCTOR] || global[USE_FUNCTION_CONSTRUCTOR]) {
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| 21 | try {
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| 22 | // eslint-disable-next-line no-new-func -- we have no alternatives without usage of modern syntax
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| 23 | prototype = getPrototypeOf(getPrototypeOf(getPrototypeOf(Function('return async function*(){}()')())));
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| 24 | if (getPrototypeOf(prototype) === Object.prototype) AsyncIteratorPrototype = prototype;
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| 25 | } catch (error) { /* empty */ }
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| 26 | }
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| 27 | }
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| 28 |
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| 29 | if (!AsyncIteratorPrototype) AsyncIteratorPrototype = {};
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| 30 |
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| 31 | if (!has(AsyncIteratorPrototype, ASYNC_ITERATOR)) {
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| 32 | createNonEnumerableProperty(AsyncIteratorPrototype, ASYNC_ITERATOR, function () {
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| 33 | return this;
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| 34 | });
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| 35 | }
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| 36 |
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| 37 | module.exports = AsyncIteratorPrototype;
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