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authorRaindropsSys <contact@minteck.org>2023-06-22 23:06:12 +0200
committerRaindropsSys <contact@minteck.org>2023-06-22 23:06:12 +0200
commit23563c7188e089929b60f9e10721c6fc43a220ff (patch)
treeedfe2b009c82900d4ac27db02222d2f68dcad846 /includes/external/school/node_modules/graphql/subscription/mapAsyncIterator.js.flow
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-// @flow strict
-import { SYMBOL_ASYNC_ITERATOR } from '../polyfills/symbols';
-
-import type { PromiseOrValue } from '../jsutils/PromiseOrValue';
-
-/**
- * Given an AsyncIterable and a callback function, return an AsyncIterator
- * which produces values mapped via calling the callback function.
- */
-export default function mapAsyncIterator<T, U>(
- iterable: AsyncIterable<T> | AsyncGenerator<T, void, void>,
- callback: (T) => PromiseOrValue<U>,
- rejectCallback?: (any) => PromiseOrValue<U>,
-): AsyncGenerator<U, void, void> {
- // $FlowFixMe[prop-missing]
- const iteratorMethod = iterable[SYMBOL_ASYNC_ITERATOR];
- const iterator: any = iteratorMethod.call(iterable);
- let $return: any;
- let abruptClose;
- if (typeof iterator.return === 'function') {
- $return = iterator.return;
- abruptClose = (error: mixed) => {
- const rethrow = () => Promise.reject(error);
- return $return.call(iterator).then(rethrow, rethrow);
- };
- }
-
- function mapResult(result: IteratorResult<T, void>) {
- return result.done
- ? result
- : asyncMapValue(result.value, callback).then(iteratorResult, abruptClose);
- }
-
- let mapReject;
- if (rejectCallback) {
- // Capture rejectCallback to ensure it cannot be null.
- const reject = rejectCallback;
- mapReject = (error: mixed) =>
- asyncMapValue(error, reject).then(iteratorResult, abruptClose);
- }
-
- /* TODO: Flow doesn't support symbols as keys:
- https://github.com/facebook/flow/issues/3258 */
- return ({
- next(): Promise<IteratorResult<U, void>> {
- return iterator.next().then(mapResult, mapReject);
- },
- return() {
- return $return
- ? $return.call(iterator).then(mapResult, mapReject)
- : Promise.resolve({ value: undefined, done: true });
- },
- throw(error?: mixed): Promise<IteratorResult<U, void>> {
- if (typeof iterator.throw === 'function') {
- return iterator.throw(error).then(mapResult, mapReject);
- }
- return Promise.reject(error).catch(abruptClose);
- },
- [SYMBOL_ASYNC_ITERATOR]() {
- return this;
- },
- }: $FlowFixMe);
-}
-
-function asyncMapValue<T, U>(
- value: T,
- callback: (T) => PromiseOrValue<U>,
-): Promise<U> {
- return new Promise((resolve) => resolve(callback(value)));
-}
-
-function iteratorResult<T>(value: T): IteratorResult<T, void> {
- return { value, done: false };
-}