bump-version.js

#!/usr/bin/env node
const parseArgs = (args) => {
  const parsedArgs = {};
  args.forEach((arg) => {
    const parts = arg.split("=");
    parsedArgs[parts[0]] = parts[1];
  });

  return parsedArgs;
};

const args = parseArgs(process.argv.slice(2));

const { writeFile, readFile, readFileSync } = require('fs');
const pkg = JSON.parse(readFileSync('./package.json')),
  current_version =  pkg.version,
  date = new Date(),
  new_major = date.getFullYear(),
  new_minor = String(date.getMonth() + 1),
  major_minor = `${new_major}.${new_minor}`;

let [major, minor, patch] = current_version.split('.');

if (major_minor !== `${major}.${minor}`) {
  patch = 0;
} else {
  patch++;
}

let new_version = `${major_minor}.${patch}`;
if (args.setPrefix) {
  new_version += `.${args.setPrefix}`
}

console.log('Updating version: ', current_version, '=>', new_version);

['./package.json', 'src/browser-specific/chrome/manifest.json', 'src/browser-specific/firefox/manifest.json'].forEach(path => {
  readFile(path, (error, data) => {
    if (error) {
      console.log(error);
      return;
    }
    const parsedData = JSON.parse(data);
    parsedData.version = new_version;
    writeFile(path, JSON.stringify(parsedData, null, 2), (err) => {
      if (err) {
        console.log(`Failed to write version to ${path}`);
        return;
      }
      console.log(`Updated ${path} successfully`);
    });
  });
});