@thi.ng/transclude/tpl/whitespace.js

Extensible functional template engine for text document generation, incl. various high-level Markdown features

const tabsToSpaces = (size = 4) => {
  const indent = " ".repeat(size);
  return ({ src }) => src.replace(/^\t+/gm, (x) => indent.repeat(x.length));
};
const compactEmptyLines = ({ src, eol }) => src.replace(/(\r?\n){2,}/g, eol.repeat(2)).trim() + eol;
export {
  compactEmptyLines,
  tabsToSpaces
};