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'use strict';
// https://github.com/tc39/proposal-iterator-helpers
var $ = require('../internals/export');
var call = require('../internals/function-call');
var anObject = require('../internals/an-object');
var getIteratorDirect = require('../internals/get-iterator-direct');
var notANaN = require('../internals/not-a-nan');
var toPositiveInteger = require('../internals/to-positive-integer');
var createAsyncIteratorProxy = require('../internals/async-iterator-create-proxy');
var createIterResultObject = require('../internals/create-iter-result-object');
var AsyncIteratorProxy = createAsyncIteratorProxy(function (Promise) {
var state = this;
return new Promise(function (resolve, reject) {
var doneAndReject = function (error) {
state.done = true;
reject(error);
};
var loop = function () {
try {
Promise.resolve(anObject(call(state.next, state.iterator))).then(function (step) {
try {
if (anObject(step).done) {
state.done = true;
resolve(createIterResultObject(undefined, true));
} else if (state.remaining) {
state.remaining--;
loop();
} else resolve(createIterResultObject(step.value, false));
} catch (err) { doneAndReject(err); }
}, doneAndReject);
} catch (error) { doneAndReject(error); }
};
loop();
});
});
$({ target: 'AsyncIterator', proto: true, real: true, forced: true }, {
drop: function drop(limit) {
return new AsyncIteratorProxy(getIteratorDirect(this), {
remaining: toPositiveInteger(notANaN(+limit))
});
}
});