next/server/api/story/[id]/[chapter]/index.get.ts

import chapterTransformer from "~/lib/server/dbHelpers/chapterTransformer";
import storyQuerier from "~/lib/server/dbHelpers/storyQuerier";
import storyCheck from "~/lib/server/middlewareButNotReally/storyCheck";

export default eventHandler(async (ev) => {
	const story = await storyQuerier(ev);
	const bi = parseInt(getRouterParam(ev, "chapter")!);
	const chres = await storyCheck(ev, story, bi - 1);
	if (chres != null) {
		throw createError(chres);
	}
	return await chapterTransformer(story, ev, bi - 1);
});