@kamilkisiela/graphql-tools
Version:
Useful tools to create and manipulate GraphQL schemas.
59 lines • 2.13 kB
JavaScript
Object.defineProperty(exports, "__esModule", { value: true });
var iterall_1 = require("iterall");
/**
* Given an AsyncIterable and a callback function, return an AsyncIterator
* which produces values mapped via calling the callback function.
*/
function mapAsyncIterator(iterator, callback, rejectCallback) {
var _a;
var $return;
var abruptClose;
if (typeof iterator.return === 'function') {
$return = iterator.return;
abruptClose = function (error) {
var rethrow = function () { return Promise.reject(error); };
return $return.call(iterator).then(rethrow, rethrow);
};
}
function mapResult(result) {
return result.done
? result
: asyncMapValue(result.value, callback).then(iteratorResult, abruptClose);
}
var mapReject;
if (rejectCallback) {
// Capture rejectCallback to ensure it cannot be null.
var reject_1 = rejectCallback;
mapReject = function (error) {
return asyncMapValue(error, reject_1).then(iteratorResult, abruptClose);
};
}
return _a = {
next: function () {
return iterator.next().then(mapResult, mapReject);
},
return: function () {
return $return
? $return.call(iterator).then(mapResult, mapReject)
: Promise.resolve({ value: undefined, done: true });
},
throw: function (error) {
if (typeof iterator.throw === 'function') {
return iterator.throw(error).then(mapResult, mapReject);
}
return Promise.reject(error).catch(abruptClose);
}
},
_a[iterall_1.$$asyncIterator] = function () {
return this;
},
_a;
}
exports.default = mapAsyncIterator;
function asyncMapValue(value, callback) {
return new Promise(function (resolve) { return resolve(callback(value)); });
}
function iteratorResult(value) {
return { value: value, done: false };
}
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