npm-fetch-changelog/parseChangelog.mjs

fetch the changelog for an npm package from GitHub

const versionRx = `\\[?v?\\d+\\.\\d+(\\.\\d+(-[-a-z0-9.]+)?)?\\]?`;
export default function parseChangelog(text) {
  const result = {};
  const versionHeaderRx = new RegExp(`^#+\\s+(${versionRx})(.*)$|^(${versionRx})(.*)(\r\n?|\n)(=+|-+)`, 'mg');
  let match;
  let start = 0;
  let release;
  while (match = versionHeaderRx.exec(text)) {
    const rawVersion = match[1] || match[5];
    let version = rawVersion.replace(/\[|\]/g, '');
    if (!match[2] && !match[6]) version += '.0';
    if (release) release.body = text.substring(start, match.index).trim();
    release = {
      version,
      header: match[0]
    };
    result[version] = release;
    start = match.index + match[0].length;
  }
  if (release) release.body = text.substring(start).trim();
  return result;
}