npm install customshells

const customshells = require('customshells');

const shell = customshells.create();

    // Run a Node.js module
    // at every node in 
    // a directory tree.

    // Pipe all output
    // to 'example/output.txt'.

shell
    .node('myModule.js')
    .tree('example/root/node')
    .toFile('example/output.txt')
    .run();