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path: root/source/features/conflict-marker.tsx
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import './conflict-marker.css';
import React from 'dom-chef';
import * as pageDetect from 'github-url-detection';
import {AlertIcon} from '@primer/octicons-react';
import batchedFunction from 'batched-function';

import features from '../feature-manager.js';
import api from '../github-helpers/api.js';
import observe from '../helpers/selector-observer.js';
import {isHasSelectorSupported} from '../helpers/select-has.js';

async function addIcon(links: HTMLAnchorElement[]): Promise<void> {
	const prConfigs = links.map(link => {
		const [, owner, name, , prNumber] = link.pathname.split('/');
		const key = api.escapeKey(owner, name, prNumber);
		return {
			key, link, owner, name, number: Number(prNumber),
		};
	});

	// Batch queries cannot be exported to .gql files
	const batchQuery = prConfigs.map(({key, owner, name, number}) => `
		${key}: repository(owner: "${owner}", name: "${name}") {
			pullRequest(number: ${number}) {
				mergeable
			}
		}
	`).join('\n');

	const data = await api.v4(batchQuery);

	for (const pr of prConfigs) {
		if (data[pr.key].pullRequest.mergeable === 'CONFLICTING') {
			pr.link.after(
				<a
					className="rgh-conflict-marker tooltipped tooltipped-e color-fg-muted ml-2"
					aria-label="This PR has conflicts that must be resolved"
					href={`${pr.link.pathname}#partial-pull-merging`}
				>
					<AlertIcon className="v-align-middle"/>
				</a>,
			);
		}
	}
}

function init(signal: AbortSignal): void {
	observe('.js-issue-row:has(.octicon-git-pull-request.color-fg-open) a.js-navigation-open', batchedFunction(addIcon, {delay: 100}), {signal});
}

void features.add(import.meta.url, {
	asLongAs: [
		isHasSelectorSupported,
	],
	include: [
		pageDetect.isIssueOrPRList,
	],
	exclude: [
		pageDetect.isBlank,
	],
	init,
});

/*
Test URLs
https://github.com/pulls
https://github.com/refined-github/sandbox/issues?q=conflict
https://github.com/kubernetes/kubernetes/milestone/62
*/