Using npm API to remove dev dependencies from your node_modules folder (equivalent of `npm prune --production`)

prune_example.js

var npm = require('npm');

var cb = funtion (error) {
  if (error) {
    console.log('Failed to remove devDependencies');
  } else {
    console.log('devDependencies removed from node_modules');
  }
};

// Before calling a command we need to setup it's configuration
npm.load({
    production: true, // Will make prune remove devDependencies 
    prefix: PATH_TO_NODE_MODULES_PARENT // Optional. If not provided, remove node_modules from the current app
  }, 
  function (error) {
    if (error) {
        cb(error);
        return;
    }
    
    // The configuration is ready so we call the prune command
    npm.commands.prune(cb);
  }
);