update-dependency.js

#!/usr/bin/env node
var fs = require('fs');
var path = require('path');
var glob = require('glob');
var childProcess = require('child_process');

// Make sure we have required command line arguments.
if (process.argv.length < 4) {
    var msg = '** Must supply a target library and separate version specifier';
    process.stderr.write(msg);
    process.exit(1);
}

// Extract the desired library target and specifier.
var target = process.argv[2];
var specifier = process.argv[3];

// Translate @latest to a concrete version.
if (specifier === '@latest') {
  var cmd = 'npm view ' + target + ' version';
  var specifier = childProcess.execSync(cmd);
  specifier = '^' + String(specifier).trim();
}


// Get all of the packages.
var basePath = path.resolve('.');
var lernaConfig = require(path.join(basePath, 'lerna.json'));
var packageConfig = lernaConfig.packages;


// Handle the packages
for (var i = 0; i < packageConfig.length; i++) {
  var files = glob.sync(path.join(basePath, packageConfig[i]));
  for (var j = 0; j < files.length; j++) {
    handlePackage(files[j]);
  }
}
handlePackage(basePath);


/**
 * Handle an individual package on the path - update the dependency.
 */
function handlePackage(packagePath) {
  // Read in the package.json.
  var packagePath = path.join(packagePath, 'package.json');
  try {
    var package = require(packagePath);
  } catch (e) {
    console.log('Skipping package ' + packagePath);
    return;
  }

  // Update dependencies as appropriate.
  if (target in package['dependencies']) {
    package['dependencies'][target] = specifier;
  } else if (target in package['devDependencies']) {
    package['devDependencies'][target] = specifier;
  }

  // Write the file back to disk.
  fs.writeFileSync(packagePath, JSON.stringify(package, null, 2) + '\n');
}