add-to-npm.js

#!/usr/bin/env node

const util = require('util');
const execp = util.promisify(require('child_process').exec);

main(process.argv[2], process.argv[3]);

async function main(pkg, user) {
  const whoamioutput = await execp(`npm whoami`);
  const whoami = whoamioutput.stdout.trim();
  try {
    const output = await execp(`npm owner ls ${pkg}`);
    const owners = output.stdout
      .trim()
      .split('\n')
      .map(o => o.split(' ')[0]);
    if (!owners.includes(whoami)) {
      console.log(`ERROR: ${pkg} doesn't include ~${whoami}`);
      return;
    }
  } catch (e) {
    console.log(`ERROR: ${pkg} doesn't exist`);
    return;
  }

  try {
    await execp(`npm owner add ${user} ${pkg}`);
  } catch (e) {
    // Probably...
    console.log(`ERROR: don't have proper permissions on ${pkg}`);
  }
}