Getting update manifest for lerna programmatically

getUpdates.ts

import VersionCommand from '@lerna/version';

(async () => {
  const info = await getUpdated();
  console.log(info);
})()

async function getUpdated() {
  const Package = require('@lerna/package');
  const restore = (() => {
    const orig = Package.prototype.serialize;
    Package.prototype.serialize = () => Promise.resolve();

    return () => {
      Package.prototype.serialize = orig;
    };
  })();

  const ret = await new Promise(onResolved => {
    new VersionCommand({
      gitTagVersion: false,
      push: false,
      changelog: false,

      yes: true,
      conventionalCommits: true,
      json: true,
      onResolved,
    });
  });

  restore();
  return ret;
}