62 lines
2 KiB
JavaScript
62 lines
2 KiB
JavaScript
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'use strict';
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var path = require('../internals/path');
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var aFunction = require('../internals/a-function');
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var anObject = require('../internals/an-object');
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var create = require('../internals/object-create');
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var createNonEnumerableProperty = require('../internals/create-non-enumerable-property');
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var redefineAll = require('../internals/redefine-all');
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var wellKnownSymbol = require('../internals/well-known-symbol');
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var InternalStateModule = require('../internals/internal-state');
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var getBuiltIn = require('../internals/get-built-in');
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var Promise = getBuiltIn('Promise');
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var setInternalState = InternalStateModule.set;
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var getInternalState = InternalStateModule.get;
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var TO_STRING_TAG = wellKnownSymbol('toStringTag');
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var $return = function (value) {
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var iterator = getInternalState(this).iterator;
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var $$return = iterator['return'];
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return $$return === undefined
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? Promise.resolve({ done: true, value: value })
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: anObject($$return.call(iterator, value));
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};
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var $throw = function (value) {
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var iterator = getInternalState(this).iterator;
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var $$throw = iterator['throw'];
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return $$throw === undefined
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? Promise.reject(value)
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: $$throw.call(iterator, value);
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};
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module.exports = function (nextHandler, IS_ITERATOR) {
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var AsyncIteratorProxy = function AsyncIterator(state) {
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state.next = aFunction(state.iterator.next);
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state.done = false;
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setInternalState(this, state);
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};
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AsyncIteratorProxy.prototype = redefineAll(create(path.AsyncIterator.prototype), {
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next: function next(arg) {
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var state = getInternalState(this);
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if (state.done) return Promise.resolve({ done: true, value: undefined });
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try {
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return Promise.resolve(anObject(nextHandler.call(state, arg, Promise)));
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} catch (error) {
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return Promise.reject(error);
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}
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},
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'return': $return,
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'throw': $throw
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});
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if (!IS_ITERATOR) {
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createNonEnumerableProperty(AsyncIteratorProxy.prototype, TO_STRING_TAG, 'Generator');
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}
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return AsyncIteratorProxy;
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};
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