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