Generate TOC for GitHub Wiki

// In the Wiki Edit (/_edit) Preview mode, run this snippet in the browser console to get a Markdown of a Table of Contents:

console.log(
  '**Table of Contents**\n\n' +
  Array.from(document.querySelectorAll('h1 > a, h2 > a, h3 > a')).map((a) => (
    {'H1':'* ','H2':'  * ','H3':'    - '}[a.parentNode.tagName] +
    `[${a.parentNode.innerText.trim()}](${a.hash})`
  )).join('\n') +
  '\n\n' + '***'
);