mediawiki-skins-Vector/resources/skins.vector.search/fetch.js
bwang a560fb814a Add fetch tests from WVUI
Bug: T288686
Change-Id: Ifeb2e355482d3d5920c2535c89193cc4f36a13c9
2022-02-15 14:00:40 -06:00

54 lines
1.2 KiB
JavaScript

/**
* @typedef {Object} AbortableFetch
* @property {Promise<any>} fetch
* @property {Function} abort
*/
/**
* @typedef {Object} NullableAbortController
* @property {AbortSignal | undefined} signal
* @property {Function} abort
*/
const nullAbortController = {
signal: undefined,
abort: () => {} // Do nothing (no-op)
};
/**
* A wrapper which combines native fetch() in browsers and the following json() call.
*
* @param {string} resource
* @param {RequestInit} [init]
* @return {AbortableFetch}
*/
function fetchJson( resource, init ) {
// As of 2020, browser support for AbortController is limited:
// https://caniuse.com/abortcontroller
// so replacing it with no-op if it doesn't exist.
/* eslint-disable compat/compat */
const controller = window.AbortController ?
new AbortController() :
nullAbortController;
/* eslint-enable compat/compat */
const getJson = fetch( resource, $.extend( init, {
signal: controller.signal
} ) ).then( ( response ) => {
if ( !response.ok ) {
return Promise.reject(
'Network request failed with HTTP code ' + response.status
);
}
return response.json();
} );
return {
fetch: getJson,
abort: () => {
controller.abort();
}
};
}
module.exports = fetchJson;