import {  getSharedHighlighter,  type DiffsHighlighter,  type HighlighterTypes,  type SupportedLanguages,} from "@pierre/diffs"; import { resolveDiffThemeName } from "./diffRendering"; /** * Always highlight with the Oniguruma WASM engine — the JS regex engine can * backtrack catastrophically and hang the tokenizing thread. The shared * highlighter is a first-caller-wins singleton, so every creation site must * pass this value. */export const PREFERRED_HIGHLIGHTER: HighlighterTypes = "shiki-wasm"; const highlighterPromiseCache = new Map<string, Promise<DiffsHighlighter>>(); export function getSyntaxHighlighterPromise(language: string): Promise<DiffsHighlighter> {  const cached = highlighterPromiseCache.get(language);  if (cached) return cached;   const promise = getSharedHighlighter({    themes: [resolveDiffThemeName("dark"), resolveDiffThemeName("light")],    langs: [language as SupportedLanguages],    preferredHighlighter: PREFERRED_HIGHLIGHTER,  }).catch((error) => {    if (language === "text") {      highlighterPromiseCache.delete(language);      // "text" itself failed — Shiki cannot initialize at all, surface the error      throw error;    }    // Language not supported by Shiki — fall back to "text"    return getSyntaxHighlighterPromise("text");  });  highlighterPromiseCache.set(language, promise);  return promise;}