src/vs/workbench/api/common/extHostComments.ts/ExtHostComments/$toggleReaction
class ExtHostComments:	$toggleReaction(commentControllerHandle: number, threadHandle: number, uri: UriComponents, comment: modes.Comment, reaction: modes.CommentReaction): Promise<void> {
		const commentController = this._commentControllers.get(commentControllerHandle);

		if (!commentController || !commentController.reactionHandler) {
			return Promise.resolve(undefined);
		}

		return asPromise(() => {
			const commentThread = commentController.getCommentThread(threadHandle);
			if (commentThread) {
				const vscodeComment = commentThread.getCommentByUniqueId(comment.uniqueIdInThread);

				if (commentController !== undefined && vscodeComment) {
					if (commentController.reactionHandler) {
						return commentController.reactionHandler(vscodeComment, convertFromReaction(reaction));
					}
				}
			}

			return Promise.resolve(undefined);
		});
	}