How to use the pouchdb-fetch.AbortController function in pouchdb-fetch
To help you get started, we’ve selected a few pouchdb-fetch examples, based on popular ways it is used in public projects.
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pouchdb / pouchdb / packages / node_modules / pouchdb-adapter-http / src / index.js View on Github 
if (opts.doc_ids) {
// set this automagically for the user; it's annoying that couchdb
// requires both a "filter" and a "doc_ids" param.
params.filter = '_doc_ids';
method = 'POST';
body = {doc_ids: opts.doc_ids };
}
/* istanbul ignore next */
else if (opts.selector) {
// set this automagically for the user, similar to above
params.filter = '_selector';
method = 'POST';
body = {selector: opts.selector };
}
var controller = new AbortController();
var lastFetchedSeq;
// Get all the changes starting wtih the one immediately after the
// sequence number given by since.
var fetchData = function (since, callback) {
if (opts.aborted) {
return;
}
params.since = since;
// "since" can be any kind of json object in Cloudant/CouchDB 2.x
/* istanbul ignore next */
if (typeof params.since === "object") {
params.since = JSON.stringify(params.since);
}
if (opts.descending) {
