Function findDecorators

src/resolution/frameworks/nestjs.ts:308–326

* Find every `@Name(...)` decorator whose name is in `names`. Uses a * string-aware balanced-paren reader for the argument list so type thunks * like `@Query(() => [User])` are captured whole rather than truncated at the * inner `()`.

(safe: string, names: string[])

 * inner `()`.
 */
function findDecorators(safe: string, names: string[]): DecoratorHit[] {
  const hits: DecoratorHit[] = [];
  const re = new RegExp(`@(${names.join('|')})\\s*\\(`, 'g');
  let m: RegExpExecArray | null;
  while ((m = re.exec(safe)) !== null) {
    const openIndex = m.index + m[0].length - 1; // position of '('
    const parsed = readArgs(safe, openIndex);
    if (!parsed) continue;
    hits.push({
      name: m[1]!,
      args: parsed.args,
      index: m.index,
      end: parsed.end,
      length: parsed.end - m.index,
    });
    re.lastIndex = parsed.end; // resume past the args so nested text isn't re-scanned
  }
  return hits;
}

/**
 * Read a balanced `(...)` starting at `openIndex` (which must point at `(`).