dedent.js

function dedent(block) {
  // Find the common leading space in a block of text, then remove it.  Tabs are NOT handled.
  //let spaces = Math.min.apply(null, block.match(/^ +(?=[^ ])/gm).map((ws) => ws.length));
  //let spaces = block.match(/^ +(?=[^ ])/gm).map((ws) => ws.length).reduce(Math.min);
  let spaces = block.match(/^ +(?=[^ ])/gm).reduce((a,b) => a<b?a:b).length;
  return block.replace(new RegExp(`^ {1,${spaces}}`, 'gm'), '');
}