AsyncFromSyncIteratorContinuation.jsā¢1.52 kB
'use strict';
var GetIntrinsic = require('get-intrinsic');
var $SyntaxError = require('es-errors/syntax');
var $TypeError = require('es-errors/type');
var isObject = require('es-object-atoms/isObject');
var $Promise = GetIntrinsic('%Promise%', true);
var callBound = require('call-bound');
var CreateIterResultObject = require('./CreateIterResultObject');
var IteratorComplete = require('./IteratorComplete');
var IteratorValue = require('./IteratorValue');
var PromiseResolve = require('./PromiseResolve');
var $then = callBound('Promise.prototype.then', true);
// https://262.ecma-international.org/10.0/#sec-asyncfromsynciteratorcontinuation
module.exports = function AsyncFromSyncIteratorContinuation(result) {
if (!isObject(result)) {
throw new $TypeError('Assertion failed: Type(O) is not Object');
}
if (arguments.length > 1) {
throw new $SyntaxError('although AsyncFromSyncIteratorContinuation should take a second argument, it is not used in this implementation');
}
if (!$Promise) {
throw new $SyntaxError('This environment does not support Promises.');
}
return new $Promise(function (resolve) {
var done = IteratorComplete(result); // step 2
var value = IteratorValue(result); // step 4
var valueWrapper = PromiseResolve($Promise, value); // step 6
// eslint-disable-next-line no-shadow
var onFulfilled = function (value) { // steps 8-9
return CreateIterResultObject(value, done); // step 8.a
};
resolve($then(valueWrapper, onFulfilled)); // step 11
}); // step 12
};