module.exports = function(prop_name) {

  let max = -1;
  for (const f of app.vault.getMarkdownFiles()) {
    const fm = app.metadataCache.getFileCache(f)?.frontmatter;
    if(typeof fm?.[prop_name] === "number") {
      max = Math.max(max, fm[prop_name])
    }
  }

  return max + 1
}