D5878.id19420.diff
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	diff --git a/lib/shared/reaction-utils.js b/lib/shared/reaction-utils.js
	new file mode 100644
	--- /dev/null
	+++ b/lib/shared/reaction-utils.js
	@@ -0,0 +1,29 @@
	+// @flow
	+
	+import invariant from 'invariant';
	+
	+import type { MessageReactionInfo } from '../selectors/chat-selectors';
	+
	+function stringForReactionList(
	+ reactions: $ReadOnlyMap<string, MessageReactionInfo>,
	+): string {
	+ let reactionText = '';
	+ let index = 0;
	+ for (const key of reactions.keys()) {
	+ const reactionInfo = reactions.get(key);
	+ invariant(reactionInfo, 'reactionInfo should be set');
	+
	+ if (index > 0) {
	+ reactionText += ' ';
	+ }
	+ reactionText += key;
	+ if (reactionInfo.users.size > 1) {
	+ reactionText += ` ${reactionInfo.users.size}`;
	+ }
	+ index++;
	+ }
	+
	+ return reactionText;
	+}
	+
	+export { stringForReactionList };