hugo-extended/lib/install.js

const path = require('path');
const signale = require('signale');
const bin = require('.');

function getProjectRoot() {
  // projectRoot on postinstall could be INIT_CWD introduced in npm>=5.4
  // see: https://github.com/npm/npm/issues/16990
  const initCwd = process.env.INIT_CWD;
  if (initCwd) {
    return initCwd;
  }
  // Fallback of getting INIT_CWD
  const cwd = process.cwd();
  const paths = cwd.split(path.sep);
  // If process.cwd end with 'node_modules/*' then get the dependent root directory,
  // otherwise returns cwd (ordinary it will be the postinstall process of hugo-bin itself).
  if (paths.length > 1 && paths[paths.length - 2] === 'node_modules') {
    return path.resolve('../../', cwd);
  }
  return cwd;
}

bin(getProjectRoot()).run(['version'])
  .then(() => {
    signale.success('Hugo binary is installed successfully');
  })
  .catch(err => {
    signale.fatal(err.message);
    signale.fatal('Hugo binary installation failed');
  });