import { availableLanguages, highlight } from "@arborium/arborium";

export interface HighlightRequest {
  id: number;
  language: string;
  source: string;
}

export type HighlightReply = { id: number; html: string | null } | { id: number; error: string };

const available = new Set<string>(availableLanguages);

onmessage = async ({ data: { id, language, source } }: MessageEvent<HighlightRequest>) => {
  let reply: HighlightReply;
  try {
    reply = { id, html: available.has(language) ? await highlight(language, source) : null };
  } catch (error) {
    reply = { id, error: String(error) };
  }
  postMessage(reply);
};