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path: root/source/features/show-followers-you-know.tsx
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import React from 'dom-chef';
import select from 'select-dom';
import {getCleanPathname} from '../libs/utils';
import features from '../libs/features';
import fetchDom from '../libs/fetch-dom';

const fetchStargazers = async (): Promise<HTMLImageElement[]> => {
	const url = `/${getCleanPathname()}/followers/you_know`;
	const dom = await fetchDom(url);
	return select.all<HTMLImageElement>('.follow-list-item .avatar', dom);
};

const avatarSize = 35;
const renderAvatar = (image: HTMLImageElement): HTMLElement => {
	const src = new URL(image.src);
	src.searchParams.set('s', String(avatarSize * window.devicePixelRatio));
	image.src = String(src);
	image.width = avatarSize;
	image.height = avatarSize;

	return (
		<a
			href={(image.parentElement as HTMLAnchorElement).href}
			aria-label={image.alt.substr(1)}
			className="tooltipped tooltipped-n avatar-group-item mr-1"
		>
			{image}
		</a>
	);
};

async function init(): Promise<false | void> {
	const container = select('[itemtype="http://schema.org/Person"]');
	if (!container) {
		return false;
	}

	const stargazers = await fetchStargazers();
	if (stargazers.length === 0) {
		return false;
	}

	container.append(
		<div className="border-top py-3 clearfix">
			<h2 className="mb-1 h4">Followers you know</h2>
			{stargazers.map(renderAvatar)}
		</div>
	);
}

features.add({
	id: __featureName__,
	description: 'Followers you know are shown on profile pages',
	screenshot: false,
	include: [
		features.isUserProfile
	],
	exclude: [
		features.isOwnUserProfile
	],
	load: features.onAjaxedPages,
	init
});