Function requireMessage

site/src/api/queries/chats.test.ts:1002–1011

(
		messages: readonly TypesGen.ChatMessage[],
		messageId: number,
	)

	};

	const requireMessage = (
		messages: readonly TypesGen.ChatMessage[],
		messageId: number,
	): TypesGen.ChatMessage => {
		const message = messages.find((candidate) => candidate.id === messageId);
		if (!message) {
			throw new Error(`missing message ${messageId}`);
		}
		return message;
	};

	const buildOptimisticMessage = (message: TypesGen.ChatMessage) =>
		buildOptimisticEditedMessage({