Code that looks right
wherever it renders.

type Token = { type: string; start: number; end: number };

class Highlighter {
  private cache = new Map<string, Token[]>();

  constructor(private language = 'typescript') {}

  highlight(src: string): Token[] {
    const hit = this.cache.get(src);
    if (hit) return hit;
    const toks = tokenize(this.language, src);
    this.cache.set(src, toks);
    return toks;
  }
}